Bug Summary

File:hw/9pfs/virtio-9p.c
Location:line 2852, column 9
Description:Value stored to 'err' is never read

Annotated Source Code

1/*
2 * Virtio 9p backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14#include "hw/virtio/virtio.h"
15#include "hw/i386/pc.h"
16#include "qemu/sockets.h"
17#include "virtio-9p.h"
18#include "fsdev/qemu-fsdev.h"
19#include "virtio-9p-xattr.h"
20#include "virtio-9p-coth.h"
21#include "trace.h"
22#include "migration/migration.h"
23
24int open_fd_hw;
25int total_open_fd;
26static int open_fd_rc;
27
28enum {
29 Oread = 0x00,
30 Owrite = 0x01,
31 Ordwr = 0x02,
32 Oexec = 0x03,
33 Oexcl = 0x04,
34 Otrunc = 0x10,
35 Orexec = 0x20,
36 Orclose = 0x40,
37 Oappend = 0x80,
38};
39
40static int omode_to_uflags(int8_t mode)
41{
42 int ret = 0;
43
44 switch (mode & 3) {
45 case Oread:
46 ret = O_RDONLY00;
47 break;
48 case Ordwr:
49 ret = O_RDWR02;
50 break;
51 case Owrite:
52 ret = O_WRONLY01;
53 break;
54 case Oexec:
55 ret = O_RDONLY00;
56 break;
57 }
58
59 if (mode & Otrunc) {
60 ret |= O_TRUNC01000;
61 }
62
63 if (mode & Oappend) {
64 ret |= O_APPEND02000;
65 }
66
67 if (mode & Oexcl) {
68 ret |= O_EXCL0200;
69 }
70
71 return ret;
72}
73
74struct dotl_openflag_map {
75 int dotl_flag;
76 int open_flag;
77};
78
79static int dotl_to_open_flags(int flags)
80{
81 int i;
82 /*
83 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
84 * and P9_DOTL_NOACCESS
85 */
86 int oflags = flags & O_ACCMODE0003;
87
88 struct dotl_openflag_map dotl_oflag_map[] = {
89 { P9_DOTL_CREATE00000100, O_CREAT0100 },
90 { P9_DOTL_EXCL00000200, O_EXCL0200 },
91 { P9_DOTL_NOCTTY00000400 , O_NOCTTY0400 },
92 { P9_DOTL_TRUNC00001000, O_TRUNC01000 },
93 { P9_DOTL_APPEND00002000, O_APPEND02000 },
94 { P9_DOTL_NONBLOCK00004000, O_NONBLOCK04000 } ,
95 { P9_DOTL_DSYNC00010000, O_DSYNC010000 },
96 { P9_DOTL_FASYNC00020000, FASYNC020000 },
97 { P9_DOTL_DIRECT00040000, O_DIRECT040000 },
98 { P9_DOTL_LARGEFILE00100000, O_LARGEFILE0 },
99 { P9_DOTL_DIRECTORY00200000, O_DIRECTORY0200000 },
100 { P9_DOTL_NOFOLLOW00400000, O_NOFOLLOW0400000 },
101 { P9_DOTL_NOATIME01000000, O_NOATIME01000000 },
102 { P9_DOTL_SYNC04000000, O_SYNC04010000 },
103 };
104
105 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map)(sizeof(dotl_oflag_map) / sizeof((dotl_oflag_map)[0])); i++) {
106 if (flags & dotl_oflag_map[i].dotl_flag) {
107 oflags |= dotl_oflag_map[i].open_flag;
108 }
109 }
110
111 return oflags;
112}
113
114void cred_init(FsCred *credp)
115{
116 credp->fc_uid = -1;
117 credp->fc_gid = -1;
118 credp->fc_mode = -1;
119 credp->fc_rdev = -1;
120}
121
122static int get_dotl_openflags(V9fsState *s, int oflags)
123{
124 int flags;
125 /*
126 * Filter the client open flags
127 */
128 flags = dotl_to_open_flags(oflags);
129 flags &= ~(O_NOCTTY0400 | O_ASYNC020000 | O_CREAT0100);
130 /*
131 * Ignore direct disk access hint until the server supports it.
132 */
133 flags &= ~O_DIRECT040000;
134 return flags;
135}
136
137void v9fs_path_init(V9fsPath *path)
138{
139 path->data = NULL((void*)0);
140 path->size = 0;
141}
142
143void v9fs_path_free(V9fsPath *path)
144{
145 g_free(path->data);
146 path->data = NULL((void*)0);
147 path->size = 0;
148}
149
150void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
151{
152 v9fs_path_free(lhs);
153 lhs->data = g_malloc(rhs->size);
154 memcpy(lhs->data, rhs->data, rhs->size);
155 lhs->size = rhs->size;
156}
157
158int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
159 const char *name, V9fsPath *path)
160{
161 int err;
162 err = s->ops->name_to_path(&s->ctx, dirpath, name, path);
163 if (err < 0) {
164 err = -errno(*__errno_location ());
165 }
166 return err;
167}
168
169/*
170 * Return TRUE if s1 is an ancestor of s2.
171 *
172 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
173 * As a special case, We treat s1 as ancestor of s2 if they are same!
174 */
175static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
176{
177 if (!strncmp(s1->data, s2->data, s1->size - 1)) {
178 if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
179 return 1;
180 }
181 }
182 return 0;
183}
184
185static size_t v9fs_string_size(V9fsString *str)
186{
187 return str->size;
188}
189
190/*
191 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
192static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
193{
194 int err = 1;
195 if (f->fid_type == P9_FID_FILE) {
196 if (f->fs.fd == -1) {
197 do {
198 err = v9fs_co_open(pdu, f, f->open_flags);
199 } while (err == -EINTR4 && !pdu->cancelled);
200 }
201 } else if (f->fid_type == P9_FID_DIR) {
202 if (f->fs.dir == NULL((void*)0)) {
203 do {
204 err = v9fs_co_opendir(pdu, f);
205 } while (err == -EINTR4 && !pdu->cancelled);
206 }
207 }
208 return err;
209}
210
211static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid)
212{
213 int err;
214 V9fsFidState *f;
215 V9fsState *s = pdu->s;
216
217 for (f = s->fid_list; f; f = f->next) {
218 BUG_ON(f->clunked)((!(f->clunked)) ? (void) (0) : __assert_fail ("!(f->clunked)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 218
, __PRETTY_FUNCTION__));
219 if (f->fid == fid) {
220 /*
221 * Update the fid ref upfront so that
222 * we don't get reclaimed when we yield
223 * in open later.
224 */
225 f->ref++;
226 /*
227 * check whether we need to reopen the
228 * file. We might have closed the fd
229 * while trying to free up some file
230 * descriptors.
231 */
232 err = v9fs_reopen_fid(pdu, f);
233 if (err < 0) {
234 f->ref--;
235 return NULL((void*)0);
236 }
237 /*
238 * Mark the fid as referenced so that the LRU
239 * reclaim won't close the file descriptor
240 */
241 f->flags |= FID_REFERENCED0x1;
242 return f;
243 }
244 }
245 return NULL((void*)0);
246}
247
248static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
249{
250 V9fsFidState *f;
251
252 for (f = s->fid_list; f; f = f->next) {
253 /* If fid is already there return NULL */
254 BUG_ON(f->clunked)((!(f->clunked)) ? (void) (0) : __assert_fail ("!(f->clunked)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 254
, __PRETTY_FUNCTION__));
255 if (f->fid == fid) {
256 return NULL((void*)0);
257 }
258 }
259 f = g_malloc0(sizeof(V9fsFidState));
260 f->fid = fid;
261 f->fid_type = P9_FID_NONE;
262 f->ref = 1;
263 /*
264 * Mark the fid as referenced so that the LRU
265 * reclaim won't close the file descriptor
266 */
267 f->flags |= FID_REFERENCED0x1;
268 f->next = s->fid_list;
269 s->fid_list = f;
270
271 return f;
272}
273
274static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
275{
276 int retval = 0;
277
278 if (fidp->fs.xattr.copied_len == -1) {
279 /* getxattr/listxattr fid */
280 goto free_value;
281 }
282 /*
283 * if this is fid for setxattr. clunk should
284 * result in setxattr localcall
285 */
286 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
287 /* clunk after partial write */
288 retval = -EINVAL22;
289 goto free_out;
290 }
291 if (fidp->fs.xattr.len) {
292 retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name,
293 fidp->fs.xattr.value,
294 fidp->fs.xattr.len,
295 fidp->fs.xattr.flags);
296 } else {
297 retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name);
298 }
299free_out:
300 v9fs_string_free(&fidp->fs.xattr.name);
301free_value:
302 if (fidp->fs.xattr.value) {
303 g_free(fidp->fs.xattr.value);
304 }
305 return retval;
306}
307
308static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
309{
310 int retval = 0;
311
312 if (fidp->fid_type == P9_FID_FILE) {
313 /* If we reclaimed the fd no need to close */
314 if (fidp->fs.fd != -1) {
315 retval = v9fs_co_close(pdu, &fidp->fs);
316 }
317 } else if (fidp->fid_type == P9_FID_DIR) {
318 if (fidp->fs.dir != NULL((void*)0)) {
319 retval = v9fs_co_closedir(pdu, &fidp->fs);
320 }
321 } else if (fidp->fid_type == P9_FID_XATTR) {
322 retval = v9fs_xattr_fid_clunk(pdu, fidp);
323 }
324 v9fs_path_free(&fidp->path);
325 g_free(fidp);
326 return retval;
327}
328
329static int put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
330{
331 BUG_ON(!fidp->ref)((!(!fidp->ref)) ? (void) (0) : __assert_fail ("!(!fidp->ref)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 331
, __PRETTY_FUNCTION__));
332 fidp->ref--;
333 /*
334 * Don't free the fid if it is in reclaim list
335 */
336 if (!fidp->ref && fidp->clunked) {
337 if (fidp->fid == pdu->s->root_fid) {
338 /*
339 * if the clunked fid is root fid then we
340 * have unmounted the fs on the client side.
341 * delete the migration blocker. Ideally, this
342 * should be hooked to transport close notification
343 */
344 if (pdu->s->migration_blocker) {
345 migrate_del_blocker(pdu->s->migration_blocker);
346 error_free(pdu->s->migration_blocker);
347 pdu->s->migration_blocker = NULL((void*)0);
348 }
349 }
350 return free_fid(pdu, fidp);
351 }
352 return 0;
353}
354
355static V9fsFidState *clunk_fid(V9fsState *s, int32_t fid)
356{
357 V9fsFidState **fidpp, *fidp;
358
359 for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
360 if ((*fidpp)->fid == fid) {
361 break;
362 }
363 }
364 if (*fidpp == NULL((void*)0)) {
365 return NULL((void*)0);
366 }
367 fidp = *fidpp;
368 *fidpp = fidp->next;
369 fidp->clunked = 1;
370 return fidp;
371}
372
373void v9fs_reclaim_fd(V9fsPDU *pdu)
374{
375 int reclaim_count = 0;
376 V9fsState *s = pdu->s;
377 V9fsFidState *f, *reclaim_list = NULL((void*)0);
378
379 for (f = s->fid_list; f; f = f->next) {
380 /*
381 * Unlink fids cannot be reclaimed. Check
382 * for them and skip them. Also skip fids
383 * currently being operated on.
384 */
385 if (f->ref || f->flags & FID_NON_RECLAIMABLE0x2) {
386 continue;
387 }
388 /*
389 * if it is a recently referenced fid
390 * we leave the fid untouched and clear the
391 * reference bit. We come back to it later
392 * in the next iteration. (a simple LRU without
393 * moving list elements around)
394 */
395 if (f->flags & FID_REFERENCED0x1) {
396 f->flags &= ~FID_REFERENCED0x1;
397 continue;
398 }
399 /*
400 * Add fids to reclaim list.
401 */
402 if (f->fid_type == P9_FID_FILE) {
403 if (f->fs.fd != -1) {
404 /*
405 * Up the reference count so that
406 * a clunk request won't free this fid
407 */
408 f->ref++;
409 f->rclm_lst = reclaim_list;
410 reclaim_list = f;
411 f->fs_reclaim.fd = f->fs.fd;
412 f->fs.fd = -1;
413 reclaim_count++;
414 }
415 } else if (f->fid_type == P9_FID_DIR) {
416 if (f->fs.dir != NULL((void*)0)) {
417 /*
418 * Up the reference count so that
419 * a clunk request won't free this fid
420 */
421 f->ref++;
422 f->rclm_lst = reclaim_list;
423 reclaim_list = f;
424 f->fs_reclaim.dir = f->fs.dir;
425 f->fs.dir = NULL((void*)0);
426 reclaim_count++;
427 }
428 }
429 if (reclaim_count >= open_fd_rc) {
430 break;
431 }
432 }
433 /*
434 * Now close the fid in reclaim list. Free them if they
435 * are already clunked.
436 */
437 while (reclaim_list) {
438 f = reclaim_list;
439 reclaim_list = f->rclm_lst;
440 if (f->fid_type == P9_FID_FILE) {
441 v9fs_co_close(pdu, &f->fs_reclaim);
442 } else if (f->fid_type == P9_FID_DIR) {
443 v9fs_co_closedir(pdu, &f->fs_reclaim);
444 }
445 f->rclm_lst = NULL((void*)0);
446 /*
447 * Now drop the fid reference, free it
448 * if clunked.
449 */
450 put_fid(pdu, f);
451 }
452}
453
454static int v9fs_mark_fids_unreclaim(V9fsPDU *pdu, V9fsPath *path)
455{
456 int err;
457 V9fsState *s = pdu->s;
458 V9fsFidState *fidp, head_fid;
459
460 head_fid.next = s->fid_list;
461 for (fidp = s->fid_list; fidp; fidp = fidp->next) {
462 if (fidp->path.size != path->size) {
463 continue;
464 }
465 if (!memcmp(fidp->path.data, path->data, path->size)) {
466 /* Mark the fid non reclaimable. */
467 fidp->flags |= FID_NON_RECLAIMABLE0x2;
468
469 /* reopen the file/dir if already closed */
470 err = v9fs_reopen_fid(pdu, fidp);
471 if (err < 0) {
472 return -1;
473 }
474 /*
475 * Go back to head of fid list because
476 * the list could have got updated when
477 * switched to the worker thread
478 */
479 if (err == 0) {
480 fidp = &head_fid;
481 }
482 }
483 }
484 return 0;
485}
486
487static void virtfs_reset(V9fsPDU *pdu)
488{
489 V9fsState *s = pdu->s;
490 V9fsFidState *fidp = NULL((void*)0);
491
492 /* Free all fids */
493 while (s->fid_list) {
494 fidp = s->fid_list;
495 s->fid_list = fidp->next;
496
497 if (fidp->ref) {
498 fidp->clunked = 1;
499 } else {
500 free_fid(pdu, fidp);
501 }
502 }
503 if (fidp) {
504 /* One or more unclunked fids found... */
505 error_report("9pfs:%s: One or more uncluncked fids "
506 "found during reset", __func__);
507 }
508}
509
510#define P9_QID_TYPE_DIR0x80 0x80
511#define P9_QID_TYPE_SYMLINK0x02 0x02
512
513#define P9_STAT_MODE_DIR0x80000000 0x80000000
514#define P9_STAT_MODE_APPEND0x40000000 0x40000000
515#define P9_STAT_MODE_EXCL0x20000000 0x20000000
516#define P9_STAT_MODE_MOUNT0x10000000 0x10000000
517#define P9_STAT_MODE_AUTH0x08000000 0x08000000
518#define P9_STAT_MODE_TMP0x04000000 0x04000000
519#define P9_STAT_MODE_SYMLINK0x02000000 0x02000000
520#define P9_STAT_MODE_LINK0x01000000 0x01000000
521#define P9_STAT_MODE_DEVICE0x00800000 0x00800000
522#define P9_STAT_MODE_NAMED_PIPE0x00200000 0x00200000
523#define P9_STAT_MODE_SOCKET0x00100000 0x00100000
524#define P9_STAT_MODE_SETUID0x00080000 0x00080000
525#define P9_STAT_MODE_SETGID0x00040000 0x00040000
526#define P9_STAT_MODE_SETVTX0x00010000 0x00010000
527
528#define P9_STAT_MODE_TYPE_BITS(0x80000000 | 0x02000000 | 0x01000000 | 0x00800000 | 0x00200000
| 0x00100000) (P9_STAT_MODE_DIR0x80000000 | \
529 P9_STAT_MODE_SYMLINK0x02000000 | \
530 P9_STAT_MODE_LINK0x01000000 | \
531 P9_STAT_MODE_DEVICE0x00800000 | \
532 P9_STAT_MODE_NAMED_PIPE0x00200000 | \
533 P9_STAT_MODE_SOCKET0x00100000)
534
535/* This is the algorithm from ufs in spfs */
536static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
537{
538 size_t size;
539
540 memset(&qidp->path, 0, sizeof(qidp->path));
541 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path))(((sizeof(stbuf->st_ino)) < (sizeof(qidp->path))) ? (
sizeof(stbuf->st_ino)) : (sizeof(qidp->path)));
542 memcpy(&qidp->path, &stbuf->st_ino, size);
543 qidp->version = stbuf->st_mtimest_mtim.tv_sec ^ (stbuf->st_size << 8);
544 qidp->type = 0;
545 if (S_ISDIR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0040000))) {
546 qidp->type |= P9_QID_TYPE_DIR0x80;
547 }
548 if (S_ISLNK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0120000))) {
549 qidp->type |= P9_QID_TYPE_SYMLINK0x02;
550 }
551}
552
553static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp)
554{
555 struct stat stbuf;
556 int err;
557
558 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
559 if (err < 0) {
560 return err;
561 }
562 stat_to_qid(&stbuf, qidp);
563 return 0;
564}
565
566static V9fsPDU *alloc_pdu(V9fsState *s)
567{
568 V9fsPDU *pdu = NULL((void*)0);
569
570 if (!QLIST_EMPTY(&s->free_list)((&s->free_list)->lh_first == ((void*)0))) {
571 pdu = QLIST_FIRST(&s->free_list)((&s->free_list)->lh_first);
572 QLIST_REMOVE(pdu, next)do { if ((pdu)->next.le_next != ((void*)0)) (pdu)->next
.le_next->next.le_prev = (pdu)->next.le_prev; *(pdu)->
next.le_prev = (pdu)->next.le_next; } while ( 0);
573 QLIST_INSERT_HEAD(&s->active_list, pdu, next)do { if (((pdu)->next.le_next = (&s->active_list)->
lh_first) != ((void*)0)) (&s->active_list)->lh_first
->next.le_prev = &(pdu)->next.le_next; (&s->
active_list)->lh_first = (pdu); (pdu)->next.le_prev = &
(&s->active_list)->lh_first; } while ( 0);
574 }
575 return pdu;
576}
577
578static void free_pdu(V9fsState *s, V9fsPDU *pdu)
579{
580 if (pdu) {
581 /*
582 * Cancelled pdu are added back to the freelist
583 * by flush request .
584 */
585 if (!pdu->cancelled) {
586 QLIST_REMOVE(pdu, next)do { if ((pdu)->next.le_next != ((void*)0)) (pdu)->next
.le_next->next.le_prev = (pdu)->next.le_prev; *(pdu)->
next.le_prev = (pdu)->next.le_next; } while ( 0);
587 QLIST_INSERT_HEAD(&s->free_list, pdu, next)do { if (((pdu)->next.le_next = (&s->free_list)->
lh_first) != ((void*)0)) (&s->free_list)->lh_first->
next.le_prev = &(pdu)->next.le_next; (&s->free_list
)->lh_first = (pdu); (pdu)->next.le_prev = &(&s
->free_list)->lh_first; } while ( 0);
588 }
589 }
590}
591
592/*
593 * We don't do error checking for pdu_marshal/unmarshal here
594 * because we always expect to have enough space to encode
595 * error details
596 */
597static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
598{
599 int8_t id = pdu->id + 1; /* Response */
600
601 if (len < 0) {
602 int err = -len;
603 len = 7;
604
605 if (s->proto_version != V9FS_PROTO_2000L) {
606 V9fsString str;
607
608 str.data = strerror(err);
609 str.size = strlen(str.data);
610
611 len += pdu_marshal(pdu, len, "s", &str)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, len, 1,
"s", &str);
612 id = P9_RERROR;
613 }
614
615 len += pdu_marshal(pdu, len, "d", err)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, len, 1,
"d", err);
616
617 if (s->proto_version == V9FS_PROTO_2000L) {
618 id = P9_RLERROR;
619 }
620 trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
621 }
622
623 /* fill out the header */
624 pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, 0, 1, "dbw"
, (int32_t)len, id, pdu->tag);
625
626 /* keep these in sync */
627 pdu->size = len;
628 pdu->id = id;
629
630 /* push onto queue and notify */
631 virtqueue_push(s->vq, &pdu->elem, len);
632
633 /* FIXME: we should batch these completions */
634 virtio_notify(VIRTIO_DEVICE(s)((VirtIODevice *)object_dynamic_cast_assert(((Object *)((s)))
, ("virtio-device"), "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c"
, 634, __func__)), s->vq);
635
636 /* Now wakeup anybody waiting in flush for this request */
637 qemu_co_queue_next(&pdu->complete);
638
639 free_pdu(s, pdu);
640}
641
642static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
643{
644 mode_t ret;
645
646 ret = mode & 0777;
647 if (mode & P9_STAT_MODE_DIR0x80000000) {
648 ret |= S_IFDIR0040000;
649 }
650
651 if (mode & P9_STAT_MODE_SYMLINK0x02000000) {
652 ret |= S_IFLNK0120000;
653 }
654 if (mode & P9_STAT_MODE_SOCKET0x00100000) {
655 ret |= S_IFSOCK0140000;
656 }
657 if (mode & P9_STAT_MODE_NAMED_PIPE0x00200000) {
658 ret |= S_IFIFO0010000;
659 }
660 if (mode & P9_STAT_MODE_DEVICE0x00800000) {
661 if (extension->size && extension->data[0] == 'c') {
662 ret |= S_IFCHR0020000;
663 } else {
664 ret |= S_IFBLK0060000;
665 }
666 }
667
668 if (!(ret&~0777)) {
669 ret |= S_IFREG0100000;
670 }
671
672 if (mode & P9_STAT_MODE_SETUID0x00080000) {
673 ret |= S_ISUID04000;
674 }
675 if (mode & P9_STAT_MODE_SETGID0x00040000) {
676 ret |= S_ISGID02000;
677 }
678 if (mode & P9_STAT_MODE_SETVTX0x00010000) {
679 ret |= S_ISVTX01000;
680 }
681
682 return ret;
683}
684
685static int donttouch_stat(V9fsStat *stat)
686{
687 if (stat->type == -1 &&
688 stat->dev == -1 &&
689 stat->qid.type == -1 &&
690 stat->qid.version == -1 &&
691 stat->qid.path == -1 &&
692 stat->mode == -1 &&
693 stat->atime == -1 &&
694 stat->mtime == -1 &&
695 stat->length == -1 &&
696 !stat->name.size &&
697 !stat->uid.size &&
698 !stat->gid.size &&
699 !stat->muid.size &&
700 stat->n_uid == -1 &&
701 stat->n_gid == -1 &&
702 stat->n_muid == -1) {
703 return 1;
704 }
705
706 return 0;
707}
708
709static void v9fs_stat_init(V9fsStat *stat)
710{
711 v9fs_string_init(&stat->name);
712 v9fs_string_init(&stat->uid);
713 v9fs_string_init(&stat->gid);
714 v9fs_string_init(&stat->muid);
715 v9fs_string_init(&stat->extension);
716}
717
718static void v9fs_stat_free(V9fsStat *stat)
719{
720 v9fs_string_free(&stat->name);
721 v9fs_string_free(&stat->uid);
722 v9fs_string_free(&stat->gid);
723 v9fs_string_free(&stat->muid);
724 v9fs_string_free(&stat->extension);
725}
726
727static uint32_t stat_to_v9mode(const struct stat *stbuf)
728{
729 uint32_t mode;
730
731 mode = stbuf->st_mode & 0777;
732 if (S_ISDIR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0040000))) {
733 mode |= P9_STAT_MODE_DIR0x80000000;
734 }
735
736 if (S_ISLNK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0120000))) {
737 mode |= P9_STAT_MODE_SYMLINK0x02000000;
738 }
739
740 if (S_ISSOCK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0140000))) {
741 mode |= P9_STAT_MODE_SOCKET0x00100000;
742 }
743
744 if (S_ISFIFO(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0010000))) {
745 mode |= P9_STAT_MODE_NAMED_PIPE0x00200000;
746 }
747
748 if (S_ISBLK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0060000)) || S_ISCHR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0020000))) {
749 mode |= P9_STAT_MODE_DEVICE0x00800000;
750 }
751
752 if (stbuf->st_mode & S_ISUID04000) {
753 mode |= P9_STAT_MODE_SETUID0x00080000;
754 }
755
756 if (stbuf->st_mode & S_ISGID02000) {
757 mode |= P9_STAT_MODE_SETGID0x00040000;
758 }
759
760 if (stbuf->st_mode & S_ISVTX01000) {
761 mode |= P9_STAT_MODE_SETVTX0x00010000;
762 }
763
764 return mode;
765}
766
767static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
768 const struct stat *stbuf,
769 V9fsStat *v9stat)
770{
771 int err;
772 const char *str;
773
774 memset(v9stat, 0, sizeof(*v9stat));
775
776 stat_to_qid(stbuf, &v9stat->qid);
777 v9stat->mode = stat_to_v9mode(stbuf);
778 v9stat->atime = stbuf->st_atimest_atim.tv_sec;
779 v9stat->mtime = stbuf->st_mtimest_mtim.tv_sec;
780 v9stat->length = stbuf->st_size;
781
782 v9fs_string_null(&v9stat->uid);
783 v9fs_string_null(&v9stat->gid);
784 v9fs_string_null(&v9stat->muid);
785
786 v9stat->n_uid = stbuf->st_uid;
787 v9stat->n_gid = stbuf->st_gid;
788 v9stat->n_muid = 0;
789
790 v9fs_string_null(&v9stat->extension);
791
792 if (v9stat->mode & P9_STAT_MODE_SYMLINK0x02000000) {
793 err = v9fs_co_readlink(pdu, name, &v9stat->extension);
794 if (err < 0) {
795 return err;
796 }
797 } else if (v9stat->mode & P9_STAT_MODE_DEVICE0x00800000) {
798 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
799 S_ISCHR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0020000)) ? 'c' : 'b',
800 major(stbuf->st_rdev)gnu_dev_major (stbuf->st_rdev), minor(stbuf->st_rdev)gnu_dev_minor (stbuf->st_rdev));
801 } else if (S_ISDIR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0040000)) || S_ISREG(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0100000))) {
802 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
803 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
804 }
805
806 str = strrchr(name->data, '/');
807 if (str) {
808 str += 1;
809 } else {
810 str = name->data;
811 }
812
813 v9fs_string_sprintf(&v9stat->name, "%s", str);
814
815 v9stat->size = 61 +
816 v9fs_string_size(&v9stat->name) +
817 v9fs_string_size(&v9stat->uid) +
818 v9fs_string_size(&v9stat->gid) +
819 v9fs_string_size(&v9stat->muid) +
820 v9fs_string_size(&v9stat->extension);
821 return 0;
822}
823
824#define P9_STATS_MODE0x00000001ULL 0x00000001ULL
825#define P9_STATS_NLINK0x00000002ULL 0x00000002ULL
826#define P9_STATS_UID0x00000004ULL 0x00000004ULL
827#define P9_STATS_GID0x00000008ULL 0x00000008ULL
828#define P9_STATS_RDEV0x00000010ULL 0x00000010ULL
829#define P9_STATS_ATIME0x00000020ULL 0x00000020ULL
830#define P9_STATS_MTIME0x00000040ULL 0x00000040ULL
831#define P9_STATS_CTIME0x00000080ULL 0x00000080ULL
832#define P9_STATS_INO0x00000100ULL 0x00000100ULL
833#define P9_STATS_SIZE0x00000200ULL 0x00000200ULL
834#define P9_STATS_BLOCKS0x00000400ULL 0x00000400ULL
835
836#define P9_STATS_BTIME0x00000800ULL 0x00000800ULL
837#define P9_STATS_GEN0x00001000ULL 0x00001000ULL
838#define P9_STATS_DATA_VERSION0x00002000ULL 0x00002000ULL
839
840#define P9_STATS_BASIC0x000007ffULL 0x000007ffULL /* Mask for fields up to BLOCKS */
841#define P9_STATS_ALL0x00003fffULL 0x00003fffULL /* Mask for All fields above */
842
843
844static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
845 V9fsStatDotl *v9lstat)
846{
847 memset(v9lstat, 0, sizeof(*v9lstat));
848
849 v9lstat->st_mode = stbuf->st_mode;
850 v9lstat->st_nlink = stbuf->st_nlink;
851 v9lstat->st_uid = stbuf->st_uid;
852 v9lstat->st_gid = stbuf->st_gid;
853 v9lstat->st_rdev = stbuf->st_rdev;
854 v9lstat->st_size = stbuf->st_size;
855 v9lstat->st_blksize = stbuf->st_blksize;
856 v9lstat->st_blocks = stbuf->st_blocks;
857 v9lstat->st_atime_sec = stbuf->st_atimest_atim.tv_sec;
858 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
859 v9lstat->st_mtime_sec = stbuf->st_mtimest_mtim.tv_sec;
860 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
861 v9lstat->st_ctime_sec = stbuf->st_ctimest_ctim.tv_sec;
862 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
863 /* Currently we only support BASIC fields in stat */
864 v9lstat->st_result_mask = P9_STATS_BASIC0x000007ffULL;
865
866 stat_to_qid(stbuf, &v9lstat->qid);
867}
868
869static void print_sg(struct iovec *sg, int cnt)
870{
871 int i;
872
873 printf("sg[%d]: {", cnt);
874 for (i = 0; i < cnt; i++) {
875 if (i) {
876 printf(", ");
877 }
878 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
879 }
880 printf("}\n");
881}
882
883/* Will call this only for path name based fid */
884static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
885{
886 V9fsPath str;
887 v9fs_path_init(&str);
888 v9fs_path_copy(&str, dst);
889 v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len);
890 v9fs_path_free(&str);
891 /* +1 to include terminating NULL */
892 dst->size++;
893}
894
895static inline bool_Bool is_ro_export(FsContext *ctx)
896{
897 return ctx->export_flags & V9FS_RDONLY0x00000040;
898}
899
900static void v9fs_version(void *opaque)
901{
902 ssize_t err;
903 V9fsPDU *pdu = opaque;
904 V9fsState *s = pdu->s;
905 V9fsString version;
906 size_t offset = 7;
907
908 v9fs_string_init(&version);
909 err = pdu_unmarshal(pdu, offset, "ds", &s->msize, &version)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "ds", &s->msize, &version);
910 if (err < 0) {
911 offset = err;
912 goto out;
913 }
914 trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
915
916 virtfs_reset(pdu);
917
918 if (!strcmp(version.data, "9P2000.u")) {
919 s->proto_version = V9FS_PROTO_2000U;
920 } else if (!strcmp(version.data, "9P2000.L")) {
921 s->proto_version = V9FS_PROTO_2000L;
922 } else {
923 v9fs_string_sprintf(&version, "unknown");
924 }
925
926 err = pdu_marshal(pdu, offset, "ds", s->msize, &version)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "ds", s->msize, &version);
927 if (err < 0) {
928 offset = err;
929 goto out;
930 }
931 offset += err;
932 trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data);
933out:
934 complete_pdu(s, pdu, offset);
935 v9fs_string_free(&version);
936}
937
938static void v9fs_attach(void *opaque)
939{
940 V9fsPDU *pdu = opaque;
941 V9fsState *s = pdu->s;
942 int32_t fid, afid, n_uname;
943 V9fsString uname, aname;
944 V9fsFidState *fidp;
945 size_t offset = 7;
946 V9fsQID qid;
947 ssize_t err;
948
949 v9fs_string_init(&uname);
950 v9fs_string_init(&aname);
951 err = pdu_unmarshal(pdu, offset, "ddssd", &fid,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "ddssd", &fid, &afid, &uname, &aname, &
n_uname)
952 &afid, &uname, &aname, &n_uname)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "ddssd", &fid, &afid, &uname, &aname, &
n_uname);
953 if (err < 0) {
954 goto out_nofid;
955 }
956 trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data);
957
958 fidp = alloc_fid(s, fid);
959 if (fidp == NULL((void*)0)) {
960 err = -EINVAL22;
961 goto out_nofid;
962 }
963 fidp->uid = n_uname;
964 err = v9fs_co_name_to_path(pdu, NULL((void*)0), "/", &fidp->path);
965 if (err < 0) {
966 err = -EINVAL22;
967 clunk_fid(s, fid);
968 goto out;
969 }
970 err = fid_to_qid(pdu, fidp, &qid);
971 if (err < 0) {
972 err = -EINVAL22;
973 clunk_fid(s, fid);
974 goto out;
975 }
976 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
977 if (err < 0) {
978 clunk_fid(s, fid);
979 goto out;
980 }
981 err += offset;
982 trace_v9fs_attach_return(pdu->tag, pdu->id,
983 qid.type, qid.version, qid.path);
984 /*
985 * disable migration if we haven't done already.
986 * attach could get called multiple times for the same export.
987 */
988 if (!s->migration_blocker) {
989 s->root_fid = fid;
990 error_set(&s->migration_blocker, QERR_VIRTFS_FEATURE_BLOCKS_MIGRATIONERROR_CLASS_GENERIC_ERROR, "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'",
991 s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag);
992 migrate_add_blocker(s->migration_blocker);
993 }
994out:
995 put_fid(pdu, fidp);
996out_nofid:
997 complete_pdu(s, pdu, err);
998 v9fs_string_free(&uname);
999 v9fs_string_free(&aname);
1000}
1001
1002static void v9fs_stat(void *opaque)
1003{
1004 int32_t fid;
1005 V9fsStat v9stat;
1006 ssize_t err = 0;
1007 size_t offset = 7;
1008 struct stat stbuf;
1009 V9fsFidState *fidp;
1010 V9fsPDU *pdu = opaque;
1011 V9fsState *s = pdu->s;
1012
1013 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
1014 if (err < 0) {
1015 goto out_nofid;
1016 }
1017 trace_v9fs_stat(pdu->tag, pdu->id, fid);
1018
1019 fidp = get_fid(pdu, fid);
1020 if (fidp == NULL((void*)0)) {
1021 err = -ENOENT2;
1022 goto out_nofid;
1023 }
1024 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1025 if (err < 0) {
1026 goto out;
1027 }
1028 err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat);
1029 if (err < 0) {
1030 goto out;
1031 }
1032 err = pdu_marshal(pdu, offset, "wS", 0, &v9stat)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "wS", 0, &v9stat);
1033 if (err < 0) {
1034 v9fs_stat_free(&v9stat);
1035 goto out;
1036 }
1037 trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode,
1038 v9stat.atime, v9stat.mtime, v9stat.length);
1039 err += offset;
1040 v9fs_stat_free(&v9stat);
1041out:
1042 put_fid(pdu, fidp);
1043out_nofid:
1044 complete_pdu(s, pdu, err);
1045}
1046
1047static void v9fs_getattr(void *opaque)
1048{
1049 int32_t fid;
1050 size_t offset = 7;
1051 ssize_t retval = 0;
1052 struct stat stbuf;
1053 V9fsFidState *fidp;
1054 uint64_t request_mask;
1055 V9fsStatDotl v9stat_dotl;
1056 V9fsPDU *pdu = opaque;
1057 V9fsState *s = pdu->s;
1058
1059 retval = pdu_unmarshal(pdu, offset, "dq", &fid, &request_mask)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dq", &fid, &request_mask);
1060 if (retval < 0) {
1061 goto out_nofid;
1062 }
1063 trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask);
1064
1065 fidp = get_fid(pdu, fid);
1066 if (fidp == NULL((void*)0)) {
1067 retval = -ENOENT2;
1068 goto out_nofid;
1069 }
1070 /*
1071 * Currently we only support BASIC fields in stat, so there is no
1072 * need to look at request_mask.
1073 */
1074 retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1075 if (retval < 0) {
1076 goto out;
1077 }
1078 stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
1079
1080 /* fill st_gen if requested and supported by underlying fs */
1081 if (request_mask & P9_STATS_GEN0x00001000ULL) {
1082 retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl);
1083 if (retval < 0) {
1084 goto out;
1085 }
1086 v9stat_dotl.st_result_mask |= P9_STATS_GEN0x00001000ULL;
1087 }
1088 retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "A", &v9stat_dotl);
1089 if (retval < 0) {
1090 goto out;
1091 }
1092 retval += offset;
1093 trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask,
1094 v9stat_dotl.st_mode, v9stat_dotl.st_uid,
1095 v9stat_dotl.st_gid);
1096out:
1097 put_fid(pdu, fidp);
1098out_nofid:
1099 complete_pdu(s, pdu, retval);
1100}
1101
1102/* Attribute flags */
1103#define P9_ATTR_MODE(1 << 0) (1 << 0)
1104#define P9_ATTR_UID(1 << 1) (1 << 1)
1105#define P9_ATTR_GID(1 << 2) (1 << 2)
1106#define P9_ATTR_SIZE(1 << 3) (1 << 3)
1107#define P9_ATTR_ATIME(1 << 4) (1 << 4)
1108#define P9_ATTR_MTIME(1 << 5) (1 << 5)
1109#define P9_ATTR_CTIME(1 << 6) (1 << 6)
1110#define P9_ATTR_ATIME_SET(1 << 7) (1 << 7)
1111#define P9_ATTR_MTIME_SET(1 << 8) (1 << 8)
1112
1113#define P9_ATTR_MASK127 127
1114
1115static void v9fs_setattr(void *opaque)
1116{
1117 int err = 0;
1118 int32_t fid;
1119 V9fsFidState *fidp;
1120 size_t offset = 7;
1121 V9fsIattr v9iattr;
1122 V9fsPDU *pdu = opaque;
1123 V9fsState *s = pdu->s;
1124
1125 err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dI", &fid, &v9iattr);
1126 if (err < 0) {
1127 goto out_nofid;
1128 }
1129
1130 fidp = get_fid(pdu, fid);
1131 if (fidp == NULL((void*)0)) {
1132 err = -EINVAL22;
1133 goto out_nofid;
1134 }
1135 if (v9iattr.valid & P9_ATTR_MODE(1 << 0)) {
1136 err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
1137 if (err < 0) {
1138 goto out;
1139 }
1140 }
1141 if (v9iattr.valid & (P9_ATTR_ATIME(1 << 4) | P9_ATTR_MTIME(1 << 5))) {
1142 struct timespec times[2];
1143 if (v9iattr.valid & P9_ATTR_ATIME(1 << 4)) {
1144 if (v9iattr.valid & P9_ATTR_ATIME_SET(1 << 7)) {
1145 times[0].tv_sec = v9iattr.atime_sec;
1146 times[0].tv_nsec = v9iattr.atime_nsec;
1147 } else {
1148 times[0].tv_nsec = UTIME_NOW((1l << 30) - 1l);
1149 }
1150 } else {
1151 times[0].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
1152 }
1153 if (v9iattr.valid & P9_ATTR_MTIME(1 << 5)) {
1154 if (v9iattr.valid & P9_ATTR_MTIME_SET(1 << 8)) {
1155 times[1].tv_sec = v9iattr.mtime_sec;
1156 times[1].tv_nsec = v9iattr.mtime_nsec;
1157 } else {
1158 times[1].tv_nsec = UTIME_NOW((1l << 30) - 1l);
1159 }
1160 } else {
1161 times[1].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
1162 }
1163 err = v9fs_co_utimensat(pdu, &fidp->path, times);
1164 if (err < 0) {
1165 goto out;
1166 }
1167 }
1168 /*
1169 * If the only valid entry in iattr is ctime we can call
1170 * chown(-1,-1) to update the ctime of the file
1171 */
1172 if ((v9iattr.valid & (P9_ATTR_UID(1 << 1) | P9_ATTR_GID(1 << 2))) ||
1173 ((v9iattr.valid & P9_ATTR_CTIME(1 << 6))
1174 && !((v9iattr.valid & P9_ATTR_MASK127) & ~P9_ATTR_CTIME(1 << 6)))) {
1175 if (!(v9iattr.valid & P9_ATTR_UID(1 << 1))) {
1176 v9iattr.uid = -1;
1177 }
1178 if (!(v9iattr.valid & P9_ATTR_GID(1 << 2))) {
1179 v9iattr.gid = -1;
1180 }
1181 err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
1182 v9iattr.gid);
1183 if (err < 0) {
1184 goto out;
1185 }
1186 }
1187 if (v9iattr.valid & (P9_ATTR_SIZE(1 << 3))) {
1188 err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
1189 if (err < 0) {
1190 goto out;
1191 }
1192 }
1193 err = offset;
1194out:
1195 put_fid(pdu, fidp);
1196out_nofid:
1197 complete_pdu(s, pdu, err);
1198}
1199
1200static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
1201{
1202 int i;
1203 ssize_t err;
1204 size_t offset = 7;
1205
1206 err = pdu_marshal(pdu, offset, "w", nwnames)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "w", nwnames);
1207 if (err < 0) {
1208 return err;
1209 }
1210 offset += err;
1211 for (i = 0; i < nwnames; i++) {
1212 err = pdu_marshal(pdu, offset, "Q", &qids[i])v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qids[i]);
1213 if (err < 0) {
1214 return err;
1215 }
1216 offset += err;
1217 }
1218 return offset;
1219}
1220
1221static void v9fs_walk(void *opaque)
1222{
1223 int name_idx;
1224 V9fsQID *qids = NULL((void*)0);
1225 int i, err = 0;
1226 V9fsPath dpath, path;
1227 uint16_t nwnames;
1228 struct stat stbuf;
1229 size_t offset = 7;
1230 int32_t fid, newfid;
1231 V9fsString *wnames = NULL((void*)0);
1232 V9fsFidState *fidp;
1233 V9fsFidState *newfidp = NULL((void*)0);
1234 V9fsPDU *pdu = opaque;
1235 V9fsState *s = pdu->s;
1236
1237 err = pdu_unmarshal(pdu, offset, "ddw", &fid, &newfid, &nwnames)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "ddw", &fid, &newfid, &nwnames);
1238 if (err < 0) {
1239 complete_pdu(s, pdu, err);
1240 return ;
1241 }
1242 offset += err;
1243
1244 trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames);
1245
1246 if (nwnames && nwnames <= P9_MAXWELEM16) {
1247 wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
1248 qids = g_malloc0(sizeof(qids[0]) * nwnames);
1249 for (i = 0; i < nwnames; i++) {
1250 err = pdu_unmarshal(pdu, offset, "s", &wnames[i])v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "s", &wnames[i]);
1251 if (err < 0) {
1252 goto out_nofid;
1253 }
1254 offset += err;
1255 }
1256 } else if (nwnames > P9_MAXWELEM16) {
1257 err = -EINVAL22;
1258 goto out_nofid;
1259 }
1260 fidp = get_fid(pdu, fid);
1261 if (fidp == NULL((void*)0)) {
1262 err = -ENOENT2;
1263 goto out_nofid;
1264 }
1265 v9fs_path_init(&dpath);
1266 v9fs_path_init(&path);
1267 /*
1268 * Both dpath and path initially poin to fidp.
1269 * Needed to handle request with nwnames == 0
1270 */
1271 v9fs_path_copy(&dpath, &fidp->path);
1272 v9fs_path_copy(&path, &fidp->path);
1273 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1274 err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path);
1275 if (err < 0) {
1276 goto out;
1277 }
1278 err = v9fs_co_lstat(pdu, &path, &stbuf);
1279 if (err < 0) {
1280 goto out;
1281 }
1282 stat_to_qid(&stbuf, &qids[name_idx]);
1283 v9fs_path_copy(&dpath, &path);
1284 }
1285 if (fid == newfid) {
1286 BUG_ON(fidp->fid_type != P9_FID_NONE)((!(fidp->fid_type != P9_FID_NONE)) ? (void) (0) : __assert_fail
("!(fidp->fid_type != P9_FID_NONE)", "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c"
, 1286, __PRETTY_FUNCTION__));
1287 v9fs_path_copy(&fidp->path, &path);
1288 } else {
1289 newfidp = alloc_fid(s, newfid);
1290 if (newfidp == NULL((void*)0)) {
1291 err = -EINVAL22;
1292 goto out;
1293 }
1294 newfidp->uid = fidp->uid;
1295 v9fs_path_copy(&newfidp->path, &path);
1296 }
1297 err = v9fs_walk_marshal(pdu, nwnames, qids);
1298 trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids);
1299out:
1300 put_fid(pdu, fidp);
1301 if (newfidp) {
1302 put_fid(pdu, newfidp);
1303 }
1304 v9fs_path_free(&dpath);
1305 v9fs_path_free(&path);
1306out_nofid:
1307 complete_pdu(s, pdu, err);
1308 if (nwnames && nwnames <= P9_MAXWELEM16) {
1309 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1310 v9fs_string_free(&wnames[name_idx]);
1311 }
1312 g_free(wnames);
1313 g_free(qids);
1314 }
1315}
1316
1317static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
1318{
1319 struct statfs stbuf;
1320 int32_t iounit = 0;
1321 V9fsState *s = pdu->s;
1322
1323 /*
1324 * iounit should be multiples of f_bsize (host filesystem block size
1325 * and as well as less than (client msize - P9_IOHDRSZ))
1326 */
1327 if (!v9fs_co_statfs(pdu, path, &stbuf)) {
1328 iounit = stbuf.f_bsize;
1329 iounit *= (s->msize - P9_IOHDRSZ24)/stbuf.f_bsize;
1330 }
1331 if (!iounit) {
1332 iounit = s->msize - P9_IOHDRSZ24;
1333 }
1334 return iounit;
1335}
1336
1337static void v9fs_open(void *opaque)
1338{
1339 int flags;
1340 int32_t fid;
1341 int32_t mode;
1342 V9fsQID qid;
1343 int iounit = 0;
1344 ssize_t err = 0;
1345 size_t offset = 7;
1346 struct stat stbuf;
1347 V9fsFidState *fidp;
1348 V9fsPDU *pdu = opaque;
1349 V9fsState *s = pdu->s;
1350
1351 if (s->proto_version == V9FS_PROTO_2000L) {
1352 err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dd", &fid, &mode);
1353 } else {
1354 uint8_t modebyte;
1355 err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "db", &fid, &modebyte);
1356 mode = modebyte;
1357 }
1358 if (err < 0) {
1359 goto out_nofid;
1360 }
1361 trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
1362
1363 fidp = get_fid(pdu, fid);
1364 if (fidp == NULL((void*)0)) {
1365 err = -ENOENT2;
1366 goto out_nofid;
1367 }
1368 BUG_ON(fidp->fid_type != P9_FID_NONE)((!(fidp->fid_type != P9_FID_NONE)) ? (void) (0) : __assert_fail
("!(fidp->fid_type != P9_FID_NONE)", "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c"
, 1368, __PRETTY_FUNCTION__));
1369
1370 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1371 if (err < 0) {
1372 goto out;
1373 }
1374 stat_to_qid(&stbuf, &qid);
1375 if (S_ISDIR(stbuf.st_mode)((((stbuf.st_mode)) & 0170000) == (0040000))) {
1376 err = v9fs_co_opendir(pdu, fidp);
1377 if (err < 0) {
1378 goto out;
1379 }
1380 fidp->fid_type = P9_FID_DIR;
1381 err = pdu_marshal(pdu, offset, "Qd", &qid, 0)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, 0);
1382 if (err < 0) {
1383 goto out;
1384 }
1385 err += offset;
1386 } else {
1387 if (s->proto_version == V9FS_PROTO_2000L) {
1388 flags = get_dotl_openflags(s, mode);
1389 } else {
1390 flags = omode_to_uflags(mode);
1391 }
1392 if (is_ro_export(&s->ctx)) {
1393 if (mode & O_WRONLY01 || mode & O_RDWR02 ||
1394 mode & O_APPEND02000 || mode & O_TRUNC01000) {
1395 err = -EROFS30;
1396 goto out;
1397 }
1398 }
1399 err = v9fs_co_open(pdu, fidp, flags);
1400 if (err < 0) {
1401 goto out;
1402 }
1403 fidp->fid_type = P9_FID_FILE;
1404 fidp->open_flags = flags;
1405 if (flags & O_EXCL0200) {
1406 /*
1407 * We let the host file system do O_EXCL check
1408 * We should not reclaim such fd
1409 */
1410 fidp->flags |= FID_NON_RECLAIMABLE0x2;
1411 }
1412 iounit = get_iounit(pdu, &fidp->path);
1413 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, iounit);
1414 if (err < 0) {
1415 goto out;
1416 }
1417 err += offset;
1418 }
1419 trace_v9fs_open_return(pdu->tag, pdu->id,
1420 qid.type, qid.version, qid.path, iounit);
1421out:
1422 put_fid(pdu, fidp);
1423out_nofid:
1424 complete_pdu(s, pdu, err);
1425}
1426
1427static void v9fs_lcreate(void *opaque)
1428{
1429 int32_t dfid, flags, mode;
1430 gid_t gid;
1431 ssize_t err = 0;
1432 ssize_t offset = 7;
1433 V9fsString name;
1434 V9fsFidState *fidp;
1435 struct stat stbuf;
1436 V9fsQID qid;
1437 int32_t iounit;
1438 V9fsPDU *pdu = opaque;
1439
1440 v9fs_string_init(&name);
1441 err = pdu_unmarshal(pdu, offset, "dsddd", &dfid,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsddd", &dfid, &name, &flags, &mode, &
gid)
1442 &name, &flags, &mode, &gid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsddd", &dfid, &name, &flags, &mode, &
gid);
1443 if (err < 0) {
1444 goto out_nofid;
1445 }
1446 trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid);
1447
1448 fidp = get_fid(pdu, dfid);
1449 if (fidp == NULL((void*)0)) {
1450 err = -ENOENT2;
1451 goto out_nofid;
1452 }
1453
1454 flags = get_dotl_openflags(pdu->s, flags);
1455 err = v9fs_co_open2(pdu, fidp, &name, gid,
1456 flags | O_CREAT0100, mode, &stbuf);
1457 if (err < 0) {
1458 goto out;
1459 }
1460 fidp->fid_type = P9_FID_FILE;
1461 fidp->open_flags = flags;
1462 if (flags & O_EXCL0200) {
1463 /*
1464 * We let the host file system do O_EXCL check
1465 * We should not reclaim such fd
1466 */
1467 fidp->flags |= FID_NON_RECLAIMABLE0x2;
1468 }
1469 iounit = get_iounit(pdu, &fidp->path);
1470 stat_to_qid(&stbuf, &qid);
1471 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, iounit);
1472 if (err < 0) {
1473 goto out;
1474 }
1475 err += offset;
1476 trace_v9fs_lcreate_return(pdu->tag, pdu->id,
1477 qid.type, qid.version, qid.path, iounit);
1478out:
1479 put_fid(pdu, fidp);
1480out_nofid:
1481 complete_pdu(pdu->s, pdu, err);
1482 v9fs_string_free(&name);
1483}
1484
1485static void v9fs_fsync(void *opaque)
1486{
1487 int err;
1488 int32_t fid;
1489 int datasync;
1490 size_t offset = 7;
1491 V9fsFidState *fidp;
1492 V9fsPDU *pdu = opaque;
1493 V9fsState *s = pdu->s;
1494
1495 err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dd", &fid, &datasync);
1496 if (err < 0) {
1497 goto out_nofid;
1498 }
1499 trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync);
1500
1501 fidp = get_fid(pdu, fid);
1502 if (fidp == NULL((void*)0)) {
1503 err = -ENOENT2;
1504 goto out_nofid;
1505 }
1506 err = v9fs_co_fsync(pdu, fidp, datasync);
1507 if (!err) {
1508 err = offset;
1509 }
1510 put_fid(pdu, fidp);
1511out_nofid:
1512 complete_pdu(s, pdu, err);
1513}
1514
1515static void v9fs_clunk(void *opaque)
1516{
1517 int err;
1518 int32_t fid;
1519 size_t offset = 7;
1520 V9fsFidState *fidp;
1521 V9fsPDU *pdu = opaque;
1522 V9fsState *s = pdu->s;
1523
1524 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
1525 if (err < 0) {
1526 goto out_nofid;
1527 }
1528 trace_v9fs_clunk(pdu->tag, pdu->id, fid);
1529
1530 fidp = clunk_fid(s, fid);
1531 if (fidp == NULL((void*)0)) {
1532 err = -ENOENT2;
1533 goto out_nofid;
1534 }
1535 /*
1536 * Bump the ref so that put_fid will
1537 * free the fid.
1538 */
1539 fidp->ref++;
1540 err = put_fid(pdu, fidp);
1541 if (!err) {
1542 err = offset;
1543 }
1544out_nofid:
1545 complete_pdu(s, pdu, err);
1546}
1547
1548static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1549 uint64_t off, uint32_t max_count)
1550{
1551 ssize_t err;
1552 size_t offset = 7;
1553 int read_count;
1554 int64_t xattr_len;
1555
1556 xattr_len = fidp->fs.xattr.len;
1557 read_count = xattr_len - off;
1558 if (read_count > max_count) {
1559 read_count = max_count;
1560 } else if (read_count < 0) {
1561 /*
1562 * read beyond XATTR value
1563 */
1564 read_count = 0;
1565 }
1566 err = pdu_marshal(pdu, offset, "d", read_count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", read_count);
1567 if (err < 0) {
1568 return err;
1569 }
1570 offset += err;
1571 err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset,
1572 ((char *)fidp->fs.xattr.value) + off,
1573 read_count);
1574 if (err < 0) {
1575 return err;
1576 }
1577 offset += err;
1578 return offset;
1579}
1580
1581static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
1582 V9fsFidState *fidp, uint32_t max_count)
1583{
1584 V9fsPath path;
1585 V9fsStat v9stat;
1586 int len, err = 0;
1587 int32_t count = 0;
1588 struct stat stbuf;
1589 off_t saved_dir_pos;
1590 struct dirent *dent, *result;
1591
1592 /* save the directory position */
1593 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1594 if (saved_dir_pos < 0) {
1595 return saved_dir_pos;
1596 }
1597
1598 dent = g_malloc(sizeof(struct dirent));
1599
1600 while (1) {
1601 v9fs_path_init(&path);
1602 err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
1603 if (err || !result) {
1604 break;
1605 }
1606 err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
1607 if (err < 0) {
1608 goto out;
1609 }
1610 err = v9fs_co_lstat(pdu, &path, &stbuf);
1611 if (err < 0) {
1612 goto out;
1613 }
1614 err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat);
1615 if (err < 0) {
1616 goto out;
1617 }
1618 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1619 len = pdu_marshal(pdu, 11 + count, "S", &v9stat)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, 11 + count
, 1, "S", &v9stat);
1620 if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
1621 /* Ran out of buffer. Set dir back to old position and return */
1622 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1623 v9fs_stat_free(&v9stat);
1624 v9fs_path_free(&path);
1625 g_free(dent);
1626 return count;
1627 }
1628 count += len;
1629 v9fs_stat_free(&v9stat);
1630 v9fs_path_free(&path);
1631 saved_dir_pos = dent->d_off;
1632 }
1633out:
1634 g_free(dent);
1635 v9fs_path_free(&path);
1636 if (err < 0) {
1637 return err;
1638 }
1639 return count;
1640}
1641
1642/*
1643 * Create a QEMUIOVector for a sub-region of PDU iovecs
1644 *
1645 * @qiov: uninitialized QEMUIOVector
1646 * @skip: number of bytes to skip from beginning of PDU
1647 * @size: number of bytes to include
1648 * @is_write: true - write, false - read
1649 *
1650 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1651 * with qemu_iovec_destroy().
1652 */
1653static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
1654 size_t skip, size_t size,
1655 bool_Bool is_write)
1656{
1657 QEMUIOVector elem;
1658 struct iovec *iov;
1659 unsigned int niov;
1660
1661 if (is_write) {
1662 iov = pdu->elem.out_sg;
1663 niov = pdu->elem.out_num;
1664 } else {
1665 iov = pdu->elem.in_sg;
1666 niov = pdu->elem.in_num;
1667 }
1668
1669 qemu_iovec_init_external(&elem, iov, niov);
1670 qemu_iovec_init(qiov, niov);
1671 qemu_iovec_concat(qiov, &elem, skip, size);
1672}
1673
1674static void v9fs_read(void *opaque)
1675{
1676 int32_t fid;
1677 uint64_t off;
1678 ssize_t err = 0;
1679 int32_t count = 0;
1680 size_t offset = 7;
1681 uint32_t max_count;
1682 V9fsFidState *fidp;
1683 V9fsPDU *pdu = opaque;
1684 V9fsState *s = pdu->s;
1685
1686 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dqd", &fid, &off, &max_count);
1687 if (err < 0) {
1688 goto out_nofid;
1689 }
1690 trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count);
1691
1692 fidp = get_fid(pdu, fid);
1693 if (fidp == NULL((void*)0)) {
1694 err = -EINVAL22;
1695 goto out_nofid;
1696 }
1697 if (fidp->fid_type == P9_FID_DIR) {
1698
1699 if (off == 0) {
1700 v9fs_co_rewinddir(pdu, fidp);
1701 }
1702 count = v9fs_do_readdir_with_stat(pdu, fidp, max_count);
1703 if (count < 0) {
1704 err = count;
1705 goto out;
1706 }
1707 err = pdu_marshal(pdu, offset, "d", count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", count);
1708 if (err < 0) {
1709 goto out;
1710 }
1711 err += offset + count;
1712 } else if (fidp->fid_type == P9_FID_FILE) {
1713 QEMUIOVector qiov_full;
1714 QEMUIOVector qiov;
1715 int32_t len;
1716
1717 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false0);
1718 qemu_iovec_init(&qiov, qiov_full.niov);
1719 do {
1720 qemu_iovec_reset(&qiov);
1721 qemu_iovec_concat(&qiov, &qiov_full, count, qiov_full.size - count);
1722 if (0) {
1723 print_sg(qiov.iov, qiov.niov);
1724 }
1725 /* Loop in case of EINTR */
1726 do {
1727 len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off);
1728 if (len >= 0) {
1729 off += len;
1730 count += len;
1731 }
1732 } while (len == -EINTR4 && !pdu->cancelled);
1733 if (len < 0) {
1734 /* IO error return the error */
1735 err = len;
1736 goto out;
1737 }
1738 } while (count < max_count && len > 0);
1739 err = pdu_marshal(pdu, offset, "d", count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", count);
1740 if (err < 0) {
1741 goto out;
1742 }
1743 err += offset + count;
1744 qemu_iovec_destroy(&qiov);
1745 qemu_iovec_destroy(&qiov_full);
1746 } else if (fidp->fid_type == P9_FID_XATTR) {
1747 err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
1748 } else {
1749 err = -EINVAL22;
1750 }
1751 trace_v9fs_read_return(pdu->tag, pdu->id, count, err);
1752out:
1753 put_fid(pdu, fidp);
1754out_nofid:
1755 complete_pdu(s, pdu, err);
1756}
1757
1758static size_t v9fs_readdir_data_size(V9fsString *name)
1759{
1760 /*
1761 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1762 * size of type (1) + size of name.size (2) + strlen(name.data)
1763 */
1764 return 24 + v9fs_string_size(name);
1765}
1766
1767static int v9fs_do_readdir(V9fsPDU *pdu,
1768 V9fsFidState *fidp, int32_t max_count)
1769{
1770 size_t size;
1771 V9fsQID qid;
1772 V9fsString name;
1773 int len, err = 0;
1774 int32_t count = 0;
1775 off_t saved_dir_pos;
1776 struct dirent *dent, *result;
1777
1778 /* save the directory position */
1779 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1780 if (saved_dir_pos < 0) {
1781 return saved_dir_pos;
1782 }
1783
1784 dent = g_malloc(sizeof(struct dirent));
1785
1786 while (1) {
1787 err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
1788 if (err || !result) {
1789 break;
1790 }
1791 v9fs_string_init(&name);
1792 v9fs_string_sprintf(&name, "%s", dent->d_name);
1793 if ((count + v9fs_readdir_data_size(&name)) > max_count) {
1794 /* Ran out of buffer. Set dir back to old position and return */
1795 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1796 v9fs_string_free(&name);
1797 g_free(dent);
1798 return count;
1799 }
1800 /*
1801 * Fill up just the path field of qid because the client uses
1802 * only that. To fill the entire qid structure we will have
1803 * to stat each dirent found, which is expensive
1804 */
1805 size = MIN(sizeof(dent->d_ino), sizeof(qid.path))(((sizeof(dent->d_ino)) < (sizeof(qid.path))) ? (sizeof
(dent->d_ino)) : (sizeof(qid.path)));
1806 memcpy(&qid.path, &dent->d_ino, size);
1807 /* Fill the other fields with dummy values */
1808 qid.type = 0;
1809 qid.version = 0;
1810
1811 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1812 len = pdu_marshal(pdu, 11 + count, "Qqbs",v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, 11 + count
, 1, "Qqbs", &qid, dent->d_off, dent->d_type, &
name)
1813 &qid, dent->d_off,v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, 11 + count
, 1, "Qqbs", &qid, dent->d_off, dent->d_type, &
name)
1814 dent->d_type, &name)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, 11 + count
, 1, "Qqbs", &qid, dent->d_off, dent->d_type, &
name);
1815 if (len < 0) {
1816 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1817 v9fs_string_free(&name);
1818 g_free(dent);
1819 return len;
1820 }
1821 count += len;
1822 v9fs_string_free(&name);
1823 saved_dir_pos = dent->d_off;
1824 }
1825 g_free(dent);
1826 if (err < 0) {
1827 return err;
1828 }
1829 return count;
1830}
1831
1832static void v9fs_readdir(void *opaque)
1833{
1834 int32_t fid;
1835 V9fsFidState *fidp;
1836 ssize_t retval = 0;
1837 size_t offset = 7;
1838 uint64_t initial_offset;
1839 int32_t count;
1840 uint32_t max_count;
1841 V9fsPDU *pdu = opaque;
1842 V9fsState *s = pdu->s;
1843
1844 retval = pdu_unmarshal(pdu, offset, "dqd", &fid,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dqd", &fid, &initial_offset, &max_count)
1845 &initial_offset, &max_count)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dqd", &fid, &initial_offset, &max_count);
1846 if (retval < 0) {
1847 goto out_nofid;
1848 }
1849 trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count);
1850
1851 fidp = get_fid(pdu, fid);
1852 if (fidp == NULL((void*)0)) {
1853 retval = -EINVAL22;
1854 goto out_nofid;
1855 }
1856 if (!fidp->fs.dir) {
1857 retval = -EINVAL22;
1858 goto out;
1859 }
1860 if (initial_offset == 0) {
1861 v9fs_co_rewinddir(pdu, fidp);
1862 } else {
1863 v9fs_co_seekdir(pdu, fidp, initial_offset);
1864 }
1865 count = v9fs_do_readdir(pdu, fidp, max_count);
1866 if (count < 0) {
1867 retval = count;
1868 goto out;
1869 }
1870 retval = pdu_marshal(pdu, offset, "d", count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", count);
1871 if (retval < 0) {
1872 goto out;
1873 }
1874 retval += count + offset;
1875 trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval);
1876out:
1877 put_fid(pdu, fidp);
1878out_nofid:
1879 complete_pdu(s, pdu, retval);
1880}
1881
1882static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1883 uint64_t off, uint32_t count,
1884 struct iovec *sg, int cnt)
1885{
1886 int i, to_copy;
1887 ssize_t err = 0;
1888 int write_count;
1889 int64_t xattr_len;
1890 size_t offset = 7;
1891
1892
1893 xattr_len = fidp->fs.xattr.len;
1894 write_count = xattr_len - off;
1895 if (write_count > count) {
1896 write_count = count;
1897 } else if (write_count < 0) {
1898 /*
1899 * write beyond XATTR value len specified in
1900 * xattrcreate
1901 */
1902 err = -ENOSPC28;
1903 goto out;
1904 }
1905 err = pdu_marshal(pdu, offset, "d", write_count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", write_count);
1906 if (err < 0) {
1907 return err;
1908 }
1909 err += offset;
1910 fidp->fs.xattr.copied_len += write_count;
1911 /*
1912 * Now copy the content from sg list
1913 */
1914 for (i = 0; i < cnt; i++) {
1915 if (write_count > sg[i].iov_len) {
1916 to_copy = sg[i].iov_len;
1917 } else {
1918 to_copy = write_count;
1919 }
1920 memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
1921 /* updating vs->off since we are not using below */
1922 off += to_copy;
1923 write_count -= to_copy;
1924 }
1925out:
1926 return err;
1927}
1928
1929static void v9fs_write(void *opaque)
1930{
1931 ssize_t err;
1932 int32_t fid;
1933 uint64_t off;
1934 uint32_t count;
1935 int32_t len = 0;
1936 int32_t total = 0;
1937 size_t offset = 7;
1938 V9fsFidState *fidp;
1939 V9fsPDU *pdu = opaque;
1940 V9fsState *s = pdu->s;
1941 QEMUIOVector qiov_full;
1942 QEMUIOVector qiov;
1943
1944 err = pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &count)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dqd", &fid, &off, &count);
1945 if (err < 0) {
1946 return complete_pdu(s, pdu, err);
1947 }
1948 offset += err;
1949 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true1);
1950 trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov);
1951
1952 fidp = get_fid(pdu, fid);
1953 if (fidp == NULL((void*)0)) {
1954 err = -EINVAL22;
1955 goto out_nofid;
1956 }
1957 if (fidp->fid_type == P9_FID_FILE) {
1958 if (fidp->fs.fd == -1) {
1959 err = -EINVAL22;
1960 goto out;
1961 }
1962 } else if (fidp->fid_type == P9_FID_XATTR) {
1963 /*
1964 * setxattr operation
1965 */
1966 err = v9fs_xattr_write(s, pdu, fidp, off, count,
1967 qiov_full.iov, qiov_full.niov);
1968 goto out;
1969 } else {
1970 err = -EINVAL22;
1971 goto out;
1972 }
1973 qemu_iovec_init(&qiov, qiov_full.niov);
1974 do {
1975 qemu_iovec_reset(&qiov);
1976 qemu_iovec_concat(&qiov, &qiov_full, total, qiov_full.size - total);
1977 if (0) {
1978 print_sg(qiov.iov, qiov.niov);
1979 }
1980 /* Loop in case of EINTR */
1981 do {
1982 len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off);
1983 if (len >= 0) {
1984 off += len;
1985 total += len;
1986 }
1987 } while (len == -EINTR4 && !pdu->cancelled);
1988 if (len < 0) {
1989 /* IO error return the error */
1990 err = len;
1991 goto out_qiov;
1992 }
1993 } while (total < count && len > 0);
1994
1995 offset = 7;
1996 err = pdu_marshal(pdu, offset, "d", total)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", total);
1997 if (err < 0) {
1998 goto out;
1999 }
2000 err += offset;
2001 trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
2002out_qiov:
2003 qemu_iovec_destroy(&qiov);
2004out:
2005 put_fid(pdu, fidp);
2006out_nofid:
2007 qemu_iovec_destroy(&qiov_full);
2008 complete_pdu(s, pdu, err);
2009}
2010
2011static void v9fs_create(void *opaque)
2012{
2013 int32_t fid;
2014 int err = 0;
2015 size_t offset = 7;
2016 V9fsFidState *fidp;
2017 V9fsQID qid;
2018 int32_t perm;
2019 int8_t mode;
2020 V9fsPath path;
2021 struct stat stbuf;
2022 V9fsString name;
2023 V9fsString extension;
2024 int iounit;
2025 V9fsPDU *pdu = opaque;
2026
2027 v9fs_path_init(&path);
2028 v9fs_string_init(&name);
2029 v9fs_string_init(&extension);
2030 err = pdu_unmarshal(pdu, offset, "dsdbs", &fid, &name,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdbs", &fid, &name, &perm, &mode, &
extension)
2031 &perm, &mode, &extension)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdbs", &fid, &name, &perm, &mode, &
extension);
2032 if (err < 0) {
2033 goto out_nofid;
2034 }
2035 trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode);
2036
2037 fidp = get_fid(pdu, fid);
2038 if (fidp == NULL((void*)0)) {
2039 err = -EINVAL22;
2040 goto out_nofid;
2041 }
2042 if (perm & P9_STAT_MODE_DIR0x80000000) {
2043 err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777,
2044 fidp->uid, -1, &stbuf);
2045 if (err < 0) {
2046 goto out;
2047 }
2048 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2049 if (err < 0) {
2050 goto out;
2051 }
2052 v9fs_path_copy(&fidp->path, &path);
2053 err = v9fs_co_opendir(pdu, fidp);
2054 if (err < 0) {
2055 goto out;
2056 }
2057 fidp->fid_type = P9_FID_DIR;
2058 } else if (perm & P9_STAT_MODE_SYMLINK0x02000000) {
2059 err = v9fs_co_symlink(pdu, fidp, &name,
2060 extension.data, -1 , &stbuf);
2061 if (err < 0) {
2062 goto out;
2063 }
2064 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2065 if (err < 0) {
2066 goto out;
2067 }
2068 v9fs_path_copy(&fidp->path, &path);
2069 } else if (perm & P9_STAT_MODE_LINK0x01000000) {
2070 int32_t ofid = atoi(extension.data);
2071 V9fsFidState *ofidp = get_fid(pdu, ofid);
2072 if (ofidp == NULL((void*)0)) {
2073 err = -EINVAL22;
2074 goto out;
2075 }
2076 err = v9fs_co_link(pdu, ofidp, fidp, &name);
2077 put_fid(pdu, ofidp);
2078 if (err < 0) {
2079 goto out;
2080 }
2081 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2082 if (err < 0) {
2083 fidp->fid_type = P9_FID_NONE;
2084 goto out;
2085 }
2086 v9fs_path_copy(&fidp->path, &path);
2087 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2088 if (err < 0) {
2089 fidp->fid_type = P9_FID_NONE;
2090 goto out;
2091 }
2092 } else if (perm & P9_STAT_MODE_DEVICE0x00800000) {
2093 char ctype;
2094 uint32_t major, minor;
2095 mode_t nmode = 0;
2096
2097 if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) {
2098 err = -errno(*__errno_location ());
2099 goto out;
2100 }
2101
2102 switch (ctype) {
2103 case 'c':
2104 nmode = S_IFCHR0020000;
2105 break;
2106 case 'b':
2107 nmode = S_IFBLK0060000;
2108 break;
2109 default:
2110 err = -EIO5;
2111 goto out;
2112 }
2113
2114 nmode |= perm & 0777;
2115 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2116 makedev(major, minor)gnu_dev_makedev (major, minor), nmode, &stbuf);
2117 if (err < 0) {
2118 goto out;
2119 }
2120 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2121 if (err < 0) {
2122 goto out;
2123 }
2124 v9fs_path_copy(&fidp->path, &path);
2125 } else if (perm & P9_STAT_MODE_NAMED_PIPE0x00200000) {
2126 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2127 0, S_IFIFO0010000 | (perm & 0777), &stbuf);
2128 if (err < 0) {
2129 goto out;
2130 }
2131 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2132 if (err < 0) {
2133 goto out;
2134 }
2135 v9fs_path_copy(&fidp->path, &path);
2136 } else if (perm & P9_STAT_MODE_SOCKET0x00100000) {
2137 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2138 0, S_IFSOCK0140000 | (perm & 0777), &stbuf);
2139 if (err < 0) {
2140 goto out;
2141 }
2142 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2143 if (err < 0) {
2144 goto out;
2145 }
2146 v9fs_path_copy(&fidp->path, &path);
2147 } else {
2148 err = v9fs_co_open2(pdu, fidp, &name, -1,
2149 omode_to_uflags(mode)|O_CREAT0100, perm, &stbuf);
2150 if (err < 0) {
2151 goto out;
2152 }
2153 fidp->fid_type = P9_FID_FILE;
2154 fidp->open_flags = omode_to_uflags(mode);
2155 if (fidp->open_flags & O_EXCL0200) {
2156 /*
2157 * We let the host file system do O_EXCL check
2158 * We should not reclaim such fd
2159 */
2160 fidp->flags |= FID_NON_RECLAIMABLE0x2;
2161 }
2162 }
2163 iounit = get_iounit(pdu, &fidp->path);
2164 stat_to_qid(&stbuf, &qid);
2165 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, iounit);
2166 if (err < 0) {
2167 goto out;
2168 }
2169 err += offset;
2170 trace_v9fs_create_return(pdu->tag, pdu->id,
2171 qid.type, qid.version, qid.path, iounit);
2172out:
2173 put_fid(pdu, fidp);
2174out_nofid:
2175 complete_pdu(pdu->s, pdu, err);
2176 v9fs_string_free(&name);
2177 v9fs_string_free(&extension);
2178 v9fs_path_free(&path);
2179}
2180
2181static void v9fs_symlink(void *opaque)
2182{
2183 V9fsPDU *pdu = opaque;
2184 V9fsString name;
2185 V9fsString symname;
2186 V9fsFidState *dfidp;
2187 V9fsQID qid;
2188 struct stat stbuf;
2189 int32_t dfid;
2190 int err = 0;
2191 gid_t gid;
2192 size_t offset = 7;
2193
2194 v9fs_string_init(&name);
2195 v9fs_string_init(&symname);
2196 err = pdu_unmarshal(pdu, offset, "dssd", &dfid, &name, &symname, &gid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dssd", &dfid, &name, &symname, &gid);
2197 if (err < 0) {
2198 goto out_nofid;
2199 }
2200 trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid);
2201
2202 dfidp = get_fid(pdu, dfid);
2203 if (dfidp == NULL((void*)0)) {
2204 err = -EINVAL22;
2205 goto out_nofid;
2206 }
2207 err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf);
2208 if (err < 0) {
2209 goto out;
2210 }
2211 stat_to_qid(&stbuf, &qid);
2212 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
2213 if (err < 0) {
2214 goto out;
2215 }
2216 err += offset;
2217 trace_v9fs_symlink_return(pdu->tag, pdu->id,
2218 qid.type, qid.version, qid.path);
2219out:
2220 put_fid(pdu, dfidp);
2221out_nofid:
2222 complete_pdu(pdu->s, pdu, err);
2223 v9fs_string_free(&name);
2224 v9fs_string_free(&symname);
2225}
2226
2227static void v9fs_flush(void *opaque)
2228{
2229 ssize_t err;
2230 int16_t tag;
2231 size_t offset = 7;
2232 V9fsPDU *cancel_pdu;
2233 V9fsPDU *pdu = opaque;
2234 V9fsState *s = pdu->s;
2235
2236 err = pdu_unmarshal(pdu, offset, "w", &tag)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "w", &tag);
2237 if (err < 0) {
2238 complete_pdu(s, pdu, err);
2239 return;
2240 }
2241 trace_v9fs_flush(pdu->tag, pdu->id, tag);
2242
2243 QLIST_FOREACH(cancel_pdu, &s->active_list, next)for ((cancel_pdu) = ((&s->active_list)->lh_first); (
cancel_pdu); (cancel_pdu) = ((cancel_pdu)->next.le_next)) {
2244 if (cancel_pdu->tag == tag) {
2245 break;
2246 }
2247 }
2248 if (cancel_pdu) {
2249 cancel_pdu->cancelled = 1;
2250 /*
2251 * Wait for pdu to complete.
2252 */
2253 qemu_co_queue_wait(&cancel_pdu->complete);
2254 cancel_pdu->cancelled = 0;
2255 free_pdu(pdu->s, cancel_pdu);
2256 }
2257 complete_pdu(s, pdu, 7);
2258}
2259
2260static void v9fs_link(void *opaque)
2261{
2262 V9fsPDU *pdu = opaque;
2263 V9fsState *s = pdu->s;
2264 int32_t dfid, oldfid;
2265 V9fsFidState *dfidp, *oldfidp;
2266 V9fsString name;
2267 size_t offset = 7;
2268 int err = 0;
2269
2270 v9fs_string_init(&name);
2271 err = pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dds", &dfid, &oldfid, &name);
2272 if (err < 0) {
2273 goto out_nofid;
2274 }
2275 trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data);
2276
2277 dfidp = get_fid(pdu, dfid);
2278 if (dfidp == NULL((void*)0)) {
2279 err = -ENOENT2;
2280 goto out_nofid;
2281 }
2282
2283 oldfidp = get_fid(pdu, oldfid);
2284 if (oldfidp == NULL((void*)0)) {
2285 err = -ENOENT2;
2286 goto out;
2287 }
2288 err = v9fs_co_link(pdu, oldfidp, dfidp, &name);
2289 if (!err) {
2290 err = offset;
2291 }
2292out:
2293 put_fid(pdu, dfidp);
2294out_nofid:
2295 v9fs_string_free(&name);
2296 complete_pdu(s, pdu, err);
2297}
2298
2299/* Only works with path name based fid */
2300static void v9fs_remove(void *opaque)
2301{
2302 int32_t fid;
2303 int err = 0;
2304 size_t offset = 7;
2305 V9fsFidState *fidp;
2306 V9fsPDU *pdu = opaque;
2307
2308 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
2309 if (err < 0) {
2310 goto out_nofid;
2311 }
2312 trace_v9fs_remove(pdu->tag, pdu->id, fid);
2313
2314 fidp = get_fid(pdu, fid);
2315 if (fidp == NULL((void*)0)) {
2316 err = -EINVAL22;
2317 goto out_nofid;
2318 }
2319 /* if fs driver is not path based, return EOPNOTSUPP */
2320 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT0x00000002)) {
2321 err = -EOPNOTSUPP95;
2322 goto out_err;
2323 }
2324 /*
2325 * IF the file is unlinked, we cannot reopen
2326 * the file later. So don't reclaim fd
2327 */
2328 err = v9fs_mark_fids_unreclaim(pdu, &fidp->path);
2329 if (err < 0) {
2330 goto out_err;
2331 }
2332 err = v9fs_co_remove(pdu, &fidp->path);
2333 if (!err) {
2334 err = offset;
2335 }
2336out_err:
2337 /* For TREMOVE we need to clunk the fid even on failed remove */
2338 clunk_fid(pdu->s, fidp->fid);
2339 put_fid(pdu, fidp);
2340out_nofid:
2341 complete_pdu(pdu->s, pdu, err);
2342}
2343
2344static void v9fs_unlinkat(void *opaque)
2345{
2346 int err = 0;
2347 V9fsString name;
2348 int32_t dfid, flags;
2349 size_t offset = 7;
2350 V9fsPath path;
2351 V9fsFidState *dfidp;
2352 V9fsPDU *pdu = opaque;
2353
2354 v9fs_string_init(&name);
2355 err = pdu_unmarshal(pdu, offset, "dsd", &dfid, &name, &flags)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsd", &dfid, &name, &flags);
2356 if (err < 0) {
2357 goto out_nofid;
2358 }
2359 dfidp = get_fid(pdu, dfid);
2360 if (dfidp == NULL((void*)0)) {
2361 err = -EINVAL22;
2362 goto out_nofid;
2363 }
2364 /*
2365 * IF the file is unlinked, we cannot reopen
2366 * the file later. So don't reclaim fd
2367 */
2368 v9fs_path_init(&path);
2369 err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path);
2370 if (err < 0) {
2371 goto out_err;
2372 }
2373 err = v9fs_mark_fids_unreclaim(pdu, &path);
2374 if (err < 0) {
2375 goto out_err;
2376 }
2377 err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
2378 if (!err) {
2379 err = offset;
2380 }
2381out_err:
2382 put_fid(pdu, dfidp);
2383 v9fs_path_free(&path);
2384out_nofid:
2385 complete_pdu(pdu->s, pdu, err);
2386 v9fs_string_free(&name);
2387}
2388
2389
2390/* Only works with path name based fid */
2391static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
2392 int32_t newdirfid, V9fsString *name)
2393{
2394 char *end;
2395 int err = 0;
2396 V9fsPath new_path;
2397 V9fsFidState *tfidp;
2398 V9fsState *s = pdu->s;
2399 V9fsFidState *dirfidp = NULL((void*)0);
2400 char *old_name, *new_name;
2401
2402 v9fs_path_init(&new_path);
2403 if (newdirfid != -1) {
2404 dirfidp = get_fid(pdu, newdirfid);
2405 if (dirfidp == NULL((void*)0)) {
2406 err = -ENOENT2;
2407 goto out_nofid;
2408 }
2409 BUG_ON(dirfidp->fid_type != P9_FID_NONE)((!(dirfidp->fid_type != P9_FID_NONE)) ? (void) (0) : __assert_fail
("!(dirfidp->fid_type != P9_FID_NONE)", "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c"
, 2409, __PRETTY_FUNCTION__));
2410 v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
2411 } else {
2412 old_name = fidp->path.data;
2413 end = strrchr(old_name, '/');
2414 if (end) {
2415 end++;
2416 } else {
2417 end = old_name;
2418 }
2419 new_name = g_malloc0(end - old_name + name->size + 1);
2420 strncat(new_name, old_name, end - old_name);
2421 strncat(new_name + (end - old_name), name->data, name->size);
2422 v9fs_co_name_to_path(pdu, NULL((void*)0), new_name, &new_path);
2423 g_free(new_name);
2424 }
2425 err = v9fs_co_rename(pdu, &fidp->path, &new_path);
2426 if (err < 0) {
2427 goto out;
2428 }
2429 /*
2430 * Fixup fid's pointing to the old name to
2431 * start pointing to the new name
2432 */
2433 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2434 if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
2435 /* replace the name */
2436 v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data));
2437 }
2438 }
2439out:
2440 if (dirfidp) {
2441 put_fid(pdu, dirfidp);
2442 }
2443 v9fs_path_free(&new_path);
2444out_nofid:
2445 return err;
2446}
2447
2448/* Only works with path name based fid */
2449static void v9fs_rename(void *opaque)
2450{
2451 int32_t fid;
2452 ssize_t err = 0;
2453 size_t offset = 7;
2454 V9fsString name;
2455 int32_t newdirfid;
2456 V9fsFidState *fidp;
2457 V9fsPDU *pdu = opaque;
2458 V9fsState *s = pdu->s;
2459
2460 v9fs_string_init(&name);
2461 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newdirfid, &name)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dds", &fid, &newdirfid, &name);
2462 if (err < 0) {
2463 goto out_nofid;
2464 }
2465 fidp = get_fid(pdu, fid);
2466 if (fidp == NULL((void*)0)) {
2467 err = -ENOENT2;
2468 goto out_nofid;
2469 }
2470 BUG_ON(fidp->fid_type != P9_FID_NONE)((!(fidp->fid_type != P9_FID_NONE)) ? (void) (0) : __assert_fail
("!(fidp->fid_type != P9_FID_NONE)", "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c"
, 2470, __PRETTY_FUNCTION__));
2471 /* if fs driver is not path based, return EOPNOTSUPP */
2472 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT0x00000002)) {
2473 err = -EOPNOTSUPP95;
2474 goto out;
2475 }
2476 v9fs_path_write_lock(s);
2477 err = v9fs_complete_rename(pdu, fidp, newdirfid, &name);
2478 v9fs_path_unlock(s);
2479 if (!err) {
2480 err = offset;
2481 }
2482out:
2483 put_fid(pdu, fidp);
2484out_nofid:
2485 complete_pdu(s, pdu, err);
2486 v9fs_string_free(&name);
2487}
2488
2489static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
2490 V9fsString *old_name, V9fsPath *newdir,
2491 V9fsString *new_name)
2492{
2493 V9fsFidState *tfidp;
2494 V9fsPath oldpath, newpath;
2495 V9fsState *s = pdu->s;
2496
2497
2498 v9fs_path_init(&oldpath);
2499 v9fs_path_init(&newpath);
2500 v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
2501 v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
2502
2503 /*
2504 * Fixup fid's pointing to the old name to
2505 * start pointing to the new name
2506 */
2507 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2508 if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) {
2509 /* replace the name */
2510 v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
2511 }
2512 }
2513 v9fs_path_free(&oldpath);
2514 v9fs_path_free(&newpath);
2515}
2516
2517static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
2518 V9fsString *old_name, int32_t newdirfid,
2519 V9fsString *new_name)
2520{
2521 int err = 0;
2522 V9fsState *s = pdu->s;
2523 V9fsFidState *newdirfidp = NULL((void*)0), *olddirfidp = NULL((void*)0);
2524
2525 olddirfidp = get_fid(pdu, olddirfid);
2526 if (olddirfidp == NULL((void*)0)) {
2527 err = -ENOENT2;
2528 goto out;
2529 }
2530 if (newdirfid != -1) {
2531 newdirfidp = get_fid(pdu, newdirfid);
2532 if (newdirfidp == NULL((void*)0)) {
2533 err = -ENOENT2;
2534 goto out;
2535 }
2536 } else {
2537 newdirfidp = get_fid(pdu, olddirfid);
2538 }
2539
2540 err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name,
2541 &newdirfidp->path, new_name);
2542 if (err < 0) {
2543 goto out;
2544 }
2545 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT0x00000002) {
2546 /* Only for path based fid we need to do the below fixup */
2547 v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
2548 &newdirfidp->path, new_name);
2549 }
2550out:
2551 if (olddirfidp) {
2552 put_fid(pdu, olddirfidp);
2553 }
2554 if (newdirfidp) {
2555 put_fid(pdu, newdirfidp);
2556 }
2557 return err;
2558}
2559
2560static void v9fs_renameat(void *opaque)
2561{
2562 ssize_t err = 0;
2563 size_t offset = 7;
2564 V9fsPDU *pdu = opaque;
2565 V9fsState *s = pdu->s;
2566 int32_t olddirfid, newdirfid;
2567 V9fsString old_name, new_name;
2568
2569 v9fs_string_init(&old_name);
2570 v9fs_string_init(&new_name);
2571 err = pdu_unmarshal(pdu, offset, "dsds", &olddirfid,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsds", &olddirfid, &old_name, &newdirfid, &
new_name)
2572 &old_name, &newdirfid, &new_name)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsds", &olddirfid, &old_name, &newdirfid, &
new_name);
2573 if (err < 0) {
2574 goto out_err;
2575 }
2576
2577 v9fs_path_write_lock(s);
2578 err = v9fs_complete_renameat(pdu, olddirfid,
2579 &old_name, newdirfid, &new_name);
2580 v9fs_path_unlock(s);
2581 if (!err) {
2582 err = offset;
2583 }
2584
2585out_err:
2586 complete_pdu(s, pdu, err);
2587 v9fs_string_free(&old_name);
2588 v9fs_string_free(&new_name);
2589}
2590
2591static void v9fs_wstat(void *opaque)
2592{
2593 int32_t fid;
2594 int err = 0;
2595 int16_t unused;
2596 V9fsStat v9stat;
2597 size_t offset = 7;
2598 struct stat stbuf;
2599 V9fsFidState *fidp;
2600 V9fsPDU *pdu = opaque;
2601 V9fsState *s = pdu->s;
2602
2603 v9fs_stat_init(&v9stat);
2604 err = pdu_unmarshal(pdu, offset, "dwS", &fid, &unused, &v9stat)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dwS", &fid, &unused, &v9stat);
2605 if (err < 0) {
2606 goto out_nofid;
2607 }
2608 trace_v9fs_wstat(pdu->tag, pdu->id, fid,
2609 v9stat.mode, v9stat.atime, v9stat.mtime);
2610
2611 fidp = get_fid(pdu, fid);
2612 if (fidp == NULL((void*)0)) {
2613 err = -EINVAL22;
2614 goto out_nofid;
2615 }
2616 /* do we need to sync the file? */
2617 if (donttouch_stat(&v9stat)) {
2618 err = v9fs_co_fsync(pdu, fidp, 0);
2619 goto out;
2620 }
2621 if (v9stat.mode != -1) {
2622 uint32_t v9_mode;
2623 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2624 if (err < 0) {
2625 goto out;
2626 }
2627 v9_mode = stat_to_v9mode(&stbuf);
2628 if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS(0x80000000 | 0x02000000 | 0x01000000 | 0x00800000 | 0x00200000
| 0x00100000)) !=
2629 (v9_mode & P9_STAT_MODE_TYPE_BITS(0x80000000 | 0x02000000 | 0x01000000 | 0x00800000 | 0x00200000
| 0x00100000))) {
2630 /* Attempting to change the type */
2631 err = -EIO5;
2632 goto out;
2633 }
2634 err = v9fs_co_chmod(pdu, &fidp->path,
2635 v9mode_to_mode(v9stat.mode,
2636 &v9stat.extension));
2637 if (err < 0) {
2638 goto out;
2639 }
2640 }
2641 if (v9stat.mtime != -1 || v9stat.atime != -1) {
2642 struct timespec times[2];
2643 if (v9stat.atime != -1) {
2644 times[0].tv_sec = v9stat.atime;
2645 times[0].tv_nsec = 0;
2646 } else {
2647 times[0].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
2648 }
2649 if (v9stat.mtime != -1) {
2650 times[1].tv_sec = v9stat.mtime;
2651 times[1].tv_nsec = 0;
2652 } else {
2653 times[1].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
2654 }
2655 err = v9fs_co_utimensat(pdu, &fidp->path, times);
2656 if (err < 0) {
2657 goto out;
2658 }
2659 }
2660 if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
2661 err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid);
2662 if (err < 0) {
2663 goto out;
2664 }
2665 }
2666 if (v9stat.name.size != 0) {
2667 err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
2668 if (err < 0) {
2669 goto out;
2670 }
2671 }
2672 if (v9stat.length != -1) {
2673 err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length);
2674 if (err < 0) {
2675 goto out;
2676 }
2677 }
2678 err = offset;
2679out:
2680 put_fid(pdu, fidp);
2681out_nofid:
2682 v9fs_stat_free(&v9stat);
2683 complete_pdu(s, pdu, err);
2684}
2685
2686static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
2687{
2688 uint32_t f_type;
2689 uint32_t f_bsize;
2690 uint64_t f_blocks;
2691 uint64_t f_bfree;
2692 uint64_t f_bavail;
2693 uint64_t f_files;
2694 uint64_t f_ffree;
2695 uint64_t fsid_val;
2696 uint32_t f_namelen;
2697 size_t offset = 7;
2698 int32_t bsize_factor;
2699
2700 /*
2701 * compute bsize factor based on host file system block size
2702 * and client msize
2703 */
2704 bsize_factor = (s->msize - P9_IOHDRSZ24)/stbuf->f_bsize;
2705 if (!bsize_factor) {
2706 bsize_factor = 1;
2707 }
2708 f_type = stbuf->f_type;
2709 f_bsize = stbuf->f_bsize;
2710 f_bsize *= bsize_factor;
2711 /*
2712 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2713 * adjust(divide) the number of blocks, free blocks and available
2714 * blocks by bsize factor
2715 */
2716 f_blocks = stbuf->f_blocks/bsize_factor;
2717 f_bfree = stbuf->f_bfree/bsize_factor;
2718 f_bavail = stbuf->f_bavail/bsize_factor;
2719 f_files = stbuf->f_files;
2720 f_ffree = stbuf->f_ffree;
2721 fsid_val = (unsigned int) stbuf->f_fsid.__val[0] |
2722 (unsigned long long)stbuf->f_fsid.__val[1] << 32;
2723 f_namelen = stbuf->f_namelen;
2724
2725 return pdu_marshal(pdu, offset, "ddqqqqqqd",v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "ddqqqqqqd", f_type, f_bsize, f_blocks, f_bfree, f_bavail
, f_files, f_ffree, fsid_val, f_namelen)
2726 f_type, f_bsize, f_blocks, f_bfree,v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "ddqqqqqqd", f_type, f_bsize, f_blocks, f_bfree, f_bavail
, f_files, f_ffree, fsid_val, f_namelen)
2727 f_bavail, f_files, f_ffree,v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "ddqqqqqqd", f_type, f_bsize, f_blocks, f_bfree, f_bavail
, f_files, f_ffree, fsid_val, f_namelen)
2728 fsid_val, f_namelen)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "ddqqqqqqd", f_type, f_bsize, f_blocks, f_bfree, f_bavail
, f_files, f_ffree, fsid_val, f_namelen);
2729}
2730
2731static void v9fs_statfs(void *opaque)
2732{
2733 int32_t fid;
2734 ssize_t retval = 0;
2735 size_t offset = 7;
2736 V9fsFidState *fidp;
2737 struct statfs stbuf;
2738 V9fsPDU *pdu = opaque;
2739 V9fsState *s = pdu->s;
2740
2741 retval = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
2742 if (retval < 0) {
2743 goto out_nofid;
2744 }
2745 fidp = get_fid(pdu, fid);
2746 if (fidp == NULL((void*)0)) {
2747 retval = -ENOENT2;
2748 goto out_nofid;
2749 }
2750 retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf);
2751 if (retval < 0) {
2752 goto out;
2753 }
2754 retval = v9fs_fill_statfs(s, pdu, &stbuf);
2755 if (retval < 0) {
2756 goto out;
2757 }
2758 retval += offset;
2759out:
2760 put_fid(pdu, fidp);
2761out_nofid:
2762 complete_pdu(s, pdu, retval);
2763}
2764
2765static void v9fs_mknod(void *opaque)
2766{
2767
2768 int mode;
2769 gid_t gid;
2770 int32_t fid;
2771 V9fsQID qid;
2772 int err = 0;
2773 int major, minor;
2774 size_t offset = 7;
2775 V9fsString name;
2776 struct stat stbuf;
2777 V9fsFidState *fidp;
2778 V9fsPDU *pdu = opaque;
2779 V9fsState *s = pdu->s;
2780
2781 v9fs_string_init(&name);
2782 err = pdu_unmarshal(pdu, offset, "dsdddd", &fid, &name, &mode,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdddd", &fid, &name, &mode, &major, &
minor, &gid)
2783 &major, &minor, &gid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdddd", &fid, &name, &mode, &major, &
minor, &gid);
2784 if (err < 0) {
2785 goto out_nofid;
2786 }
2787 trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor);
2788
2789 fidp = get_fid(pdu, fid);
2790 if (fidp == NULL((void*)0)) {
2791 err = -ENOENT2;
2792 goto out_nofid;
2793 }
2794 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid,
2795 makedev(major, minor)gnu_dev_makedev (major, minor), mode, &stbuf);
2796 if (err < 0) {
2797 goto out;
2798 }
2799 stat_to_qid(&stbuf, &qid);
2800 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
2801 if (err < 0) {
2802 goto out;
2803 }
2804 err += offset;
2805 trace_v9fs_mknod_return(pdu->tag, pdu->id,
2806 qid.type, qid.version, qid.path);
2807out:
2808 put_fid(pdu, fidp);
2809out_nofid:
2810 complete_pdu(s, pdu, err);
2811 v9fs_string_free(&name);
2812}
2813
2814/*
2815 * Implement posix byte range locking code
2816 * Server side handling of locking code is very simple, because 9p server in
2817 * QEMU can handle only one client. And most of the lock handling
2818 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
2819 * do any thing in * qemu 9p server side lock code path.
2820 * So when a TLOCK request comes, always return success
2821 */
2822static void v9fs_lock(void *opaque)
2823{
2824 int8_t status;
2825 V9fsFlock flock;
2826 size_t offset = 7;
2827 struct stat stbuf;
2828 V9fsFidState *fidp;
2829 int32_t fid, err = 0;
2830 V9fsPDU *pdu = opaque;
2831 V9fsState *s = pdu->s;
2832
2833 status = P9_LOCK_ERROR2;
2834 v9fs_string_init(&flock.client_id);
2835 err = pdu_unmarshal(pdu, offset, "dbdqqds", &fid, &flock.type,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dbdqqds", &fid, &flock.type, &flock.flags, &
flock.start, &flock.length, &flock.proc_id, &flock
.client_id)
2836 &flock.flags, &flock.start, &flock.length,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dbdqqds", &fid, &flock.type, &flock.flags, &
flock.start, &flock.length, &flock.proc_id, &flock
.client_id)
2837 &flock.proc_id, &flock.client_id)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dbdqqds", &fid, &flock.type, &flock.flags, &
flock.start, &flock.length, &flock.proc_id, &flock
.client_id);
2838 if (err < 0) {
2839 goto out_nofid;
2840 }
2841 trace_v9fs_lock(pdu->tag, pdu->id, fid,
2842 flock.type, flock.start, flock.length);
2843
2844
2845 /* We support only block flag now (that too ignored currently) */
2846 if (flock.flags & ~P9_LOCK_FLAGS_BLOCK1) {
2847 err = -EINVAL22;
2848 goto out_nofid;
2849 }
2850 fidp = get_fid(pdu, fid);
2851 if (fidp == NULL((void*)0)) {
2852 err = -ENOENT2;
Value stored to 'err' is never read
2853 goto out_nofid;
2854 }
2855 err = v9fs_co_fstat(pdu, fidp, &stbuf);
2856 if (err < 0) {
2857 goto out;
2858 }
2859 status = P9_LOCK_SUCCESS0;
2860out:
2861 put_fid(pdu, fidp);
2862out_nofid:
2863 err = pdu_marshal(pdu, offset, "b", status)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "b", status);
2864 if (err > 0) {
2865 err += offset;
2866 }
2867 trace_v9fs_lock_return(pdu->tag, pdu->id, status);
2868 complete_pdu(s, pdu, err);
2869 v9fs_string_free(&flock.client_id);
2870}
2871
2872/*
2873 * When a TGETLOCK request comes, always return success because all lock
2874 * handling is done by client's VFS layer.
2875 */
2876static void v9fs_getlock(void *opaque)
2877{
2878 size_t offset = 7;
2879 struct stat stbuf;
2880 V9fsFidState *fidp;
2881 V9fsGetlock glock;
2882 int32_t fid, err = 0;
2883 V9fsPDU *pdu = opaque;
2884 V9fsState *s = pdu->s;
2885
2886 v9fs_string_init(&glock.client_id);
2887 err = pdu_unmarshal(pdu, offset, "dbqqds", &fid, &glock.type,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dbqqds", &fid, &glock.type, &glock.start, &
glock.length, &glock.proc_id, &glock.client_id)
2888 &glock.start, &glock.length, &glock.proc_id,v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dbqqds", &fid, &glock.type, &glock.start, &
glock.length, &glock.proc_id, &glock.client_id)
2889 &glock.client_id)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dbqqds", &fid, &glock.type, &glock.start, &
glock.length, &glock.proc_id, &glock.client_id);
2890 if (err < 0) {
2891 goto out_nofid;
2892 }
2893 trace_v9fs_getlock(pdu->tag, pdu->id, fid,
2894 glock.type, glock.start, glock.length);
2895
2896 fidp = get_fid(pdu, fid);
2897 if (fidp == NULL((void*)0)) {
2898 err = -ENOENT2;
2899 goto out_nofid;
2900 }
2901 err = v9fs_co_fstat(pdu, fidp, &stbuf);
2902 if (err < 0) {
2903 goto out;
2904 }
2905 glock.type = P9_LOCK_TYPE_UNLCK2;
2906 err = pdu_marshal(pdu, offset, "bqqds", glock.type,v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "bqqds", glock.type, glock.start, glock.length, glock.proc_id
, &glock.client_id)
2907 glock.start, glock.length, glock.proc_id,v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "bqqds", glock.type, glock.start, glock.length, glock.proc_id
, &glock.client_id)
2908 &glock.client_id)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "bqqds", glock.type, glock.start, glock.length, glock.proc_id
, &glock.client_id);
2909 if (err < 0) {
2910 goto out;
2911 }
2912 err += offset;
2913 trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start,
2914 glock.length, glock.proc_id);
2915out:
2916 put_fid(pdu, fidp);
2917out_nofid:
2918 complete_pdu(s, pdu, err);
2919 v9fs_string_free(&glock.client_id);
2920}
2921
2922static void v9fs_mkdir(void *opaque)
2923{
2924 V9fsPDU *pdu = opaque;
2925 size_t offset = 7;
2926 int32_t fid;
2927 struct stat stbuf;
2928 V9fsQID qid;
2929 V9fsString name;
2930 V9fsFidState *fidp;
2931 gid_t gid;
2932 int mode;
2933 int err = 0;
2934
2935 v9fs_string_init(&name);
2936 err = pdu_unmarshal(pdu, offset, "dsdd", &fid, &name, &mode, &gid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdd", &fid, &name, &mode, &gid);
2937 if (err < 0) {
2938 goto out_nofid;
2939 }
2940 trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid);
2941
2942 fidp = get_fid(pdu, fid);
2943 if (fidp == NULL((void*)0)) {
2944 err = -ENOENT2;
2945 goto out_nofid;
2946 }
2947 err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf);
2948 if (err < 0) {
2949 goto out;
2950 }
2951 stat_to_qid(&stbuf, &qid);
2952 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
2953 if (err < 0) {
2954 goto out;
2955 }
2956 err += offset;
2957 trace_v9fs_mkdir_return(pdu->tag, pdu->id,
2958 qid.type, qid.version, qid.path, err);
2959out:
2960 put_fid(pdu, fidp);
2961out_nofid:
2962 complete_pdu(pdu->s, pdu, err);
2963 v9fs_string_free(&name);
2964}
2965
2966static void v9fs_xattrwalk(void *opaque)
2967{
2968 int64_t size;
2969 V9fsString name;
2970 ssize_t err = 0;
2971 size_t offset = 7;
2972 int32_t fid, newfid;
2973 V9fsFidState *file_fidp;
2974 V9fsFidState *xattr_fidp = NULL((void*)0);
2975 V9fsPDU *pdu = opaque;
2976 V9fsState *s = pdu->s;
2977
2978 v9fs_string_init(&name);
2979 err = pdu_unmarshal(pdu, offset, "dds", &fid, &newfid, &name)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dds", &fid, &newfid, &name);
2980 if (err < 0) {
2981 goto out_nofid;
2982 }
2983 trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data);
2984
2985 file_fidp = get_fid(pdu, fid);
2986 if (file_fidp == NULL((void*)0)) {
2987 err = -ENOENT2;
2988 goto out_nofid;
2989 }
2990 xattr_fidp = alloc_fid(s, newfid);
2991 if (xattr_fidp == NULL((void*)0)) {
2992 err = -EINVAL22;
2993 goto out;
2994 }
2995 v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
2996 if (name.data == NULL((void*)0)) {
2997 /*
2998 * listxattr request. Get the size first
2999 */
3000 size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL((void*)0), 0);
3001 if (size < 0) {
3002 err = size;
3003 clunk_fid(s, xattr_fidp->fid);
3004 goto out;
3005 }
3006 /*
3007 * Read the xattr value
3008 */
3009 xattr_fidp->fs.xattr.len = size;
3010 xattr_fidp->fid_type = P9_FID_XATTR;
3011 xattr_fidp->fs.xattr.copied_len = -1;
3012 if (size) {
3013 xattr_fidp->fs.xattr.value = g_malloc(size);
3014 err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
3015 xattr_fidp->fs.xattr.value,
3016 xattr_fidp->fs.xattr.len);
3017 if (err < 0) {
3018 clunk_fid(s, xattr_fidp->fid);
3019 goto out;
3020 }
3021 }
3022 err = pdu_marshal(pdu, offset, "q", size)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "q", size);
3023 if (err < 0) {
3024 goto out;
3025 }
3026 err += offset;
3027 } else {
3028 /*
3029 * specific xattr fid. We check for xattr
3030 * presence also collect the xattr size
3031 */
3032 size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3033 &name, NULL((void*)0), 0);
3034 if (size < 0) {
3035 err = size;
3036 clunk_fid(s, xattr_fidp->fid);
3037 goto out;
3038 }
3039 /*
3040 * Read the xattr value
3041 */
3042 xattr_fidp->fs.xattr.len = size;
3043 xattr_fidp->fid_type = P9_FID_XATTR;
3044 xattr_fidp->fs.xattr.copied_len = -1;
3045 if (size) {
3046 xattr_fidp->fs.xattr.value = g_malloc(size);
3047 err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3048 &name, xattr_fidp->fs.xattr.value,
3049 xattr_fidp->fs.xattr.len);
3050 if (err < 0) {
3051 clunk_fid(s, xattr_fidp->fid);
3052 goto out;
3053 }
3054 }
3055 err = pdu_marshal(pdu, offset, "q", size)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "q", size);
3056 if (err < 0) {
3057 goto out;
3058 }
3059 err += offset;
3060 }
3061 trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size);
3062out:
3063 put_fid(pdu, file_fidp);
3064 if (xattr_fidp) {
3065 put_fid(pdu, xattr_fidp);
3066 }
3067out_nofid:
3068 complete_pdu(s, pdu, err);
3069 v9fs_string_free(&name);
3070}
3071
3072static void v9fs_xattrcreate(void *opaque)
3073{
3074 int flags;
3075 int32_t fid;
3076 int64_t size;
3077 ssize_t err = 0;
3078 V9fsString name;
3079 size_t offset = 7;
3080 V9fsFidState *file_fidp;
3081 V9fsFidState *xattr_fidp;
3082 V9fsPDU *pdu = opaque;
3083 V9fsState *s = pdu->s;
3084
3085 v9fs_string_init(&name);
3086 err = pdu_unmarshal(pdu, offset, "dsqd", &fid, &name, &size, &flags)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsqd", &fid, &name, &size, &flags);
3087 if (err < 0) {
3088 goto out_nofid;
3089 }
3090 trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
3091
3092 file_fidp = get_fid(pdu, fid);
3093 if (file_fidp == NULL((void*)0)) {
3094 err = -EINVAL22;
3095 goto out_nofid;
3096 }
3097 /* Make the file fid point to xattr */
3098 xattr_fidp = file_fidp;
3099 xattr_fidp->fid_type = P9_FID_XATTR;
3100 xattr_fidp->fs.xattr.copied_len = 0;
3101 xattr_fidp->fs.xattr.len = size;
3102 xattr_fidp->fs.xattr.flags = flags;
3103 v9fs_string_init(&xattr_fidp->fs.xattr.name);
3104 v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
3105 xattr_fidp->fs.xattr.value = g_malloc(size);
3106 err = offset;
3107 put_fid(pdu, file_fidp);
3108out_nofid:
3109 complete_pdu(s, pdu, err);
3110 v9fs_string_free(&name);
3111}
3112
3113static void v9fs_readlink(void *opaque)
3114{
3115 V9fsPDU *pdu = opaque;
3116 size_t offset = 7;
3117 V9fsString target;
3118 int32_t fid;
3119 int err = 0;
3120 V9fsFidState *fidp;
3121
3122 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
3123 if (err < 0) {
3124 goto out_nofid;
3125 }
3126 trace_v9fs_readlink(pdu->tag, pdu->id, fid);
3127 fidp = get_fid(pdu, fid);
3128 if (fidp == NULL((void*)0)) {
3129 err = -ENOENT2;
3130 goto out_nofid;
3131 }
3132
3133 v9fs_string_init(&target);
3134 err = v9fs_co_readlink(pdu, &fidp->path, &target);
3135 if (err < 0) {
3136 goto out;
3137 }
3138 err = pdu_marshal(pdu, offset, "s", &target)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "s", &target);
3139 if (err < 0) {
3140 v9fs_string_free(&target);
3141 goto out;
3142 }
3143 err += offset;
3144 trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data);
3145 v9fs_string_free(&target);
3146out:
3147 put_fid(pdu, fidp);
3148out_nofid:
3149 complete_pdu(pdu->s, pdu, err);
3150}
3151
3152static CoroutineEntry *pdu_co_handlers[] = {
3153 [P9_TREADDIR] = v9fs_readdir,
3154 [P9_TSTATFS] = v9fs_statfs,
3155 [P9_TGETATTR] = v9fs_getattr,
3156 [P9_TSETATTR] = v9fs_setattr,
3157 [P9_TXATTRWALK] = v9fs_xattrwalk,
3158 [P9_TXATTRCREATE] = v9fs_xattrcreate,
3159 [P9_TMKNOD] = v9fs_mknod,
3160 [P9_TRENAME] = v9fs_rename,
3161 [P9_TLOCK] = v9fs_lock,
3162 [P9_TGETLOCK] = v9fs_getlock,
3163 [P9_TRENAMEAT] = v9fs_renameat,
3164 [P9_TREADLINK] = v9fs_readlink,
3165 [P9_TUNLINKAT] = v9fs_unlinkat,
3166 [P9_TMKDIR] = v9fs_mkdir,
3167 [P9_TVERSION] = v9fs_version,
3168 [P9_TLOPEN] = v9fs_open,
3169 [P9_TATTACH] = v9fs_attach,
3170 [P9_TSTAT] = v9fs_stat,
3171 [P9_TWALK] = v9fs_walk,
3172 [P9_TCLUNK] = v9fs_clunk,
3173 [P9_TFSYNC] = v9fs_fsync,
3174 [P9_TOPEN] = v9fs_open,
3175 [P9_TREAD] = v9fs_read,
3176#if 0
3177 [P9_TAUTH] = v9fs_auth,
3178#endif
3179 [P9_TFLUSH] = v9fs_flush,
3180 [P9_TLINK] = v9fs_link,
3181 [P9_TSYMLINK] = v9fs_symlink,
3182 [P9_TCREATE] = v9fs_create,
3183 [P9_TLCREATE] = v9fs_lcreate,
3184 [P9_TWRITE] = v9fs_write,
3185 [P9_TWSTAT] = v9fs_wstat,
3186 [P9_TREMOVE] = v9fs_remove,
3187};
3188
3189static void v9fs_op_not_supp(void *opaque)
3190{
3191 V9fsPDU *pdu = opaque;
3192 complete_pdu(pdu->s, pdu, -EOPNOTSUPP95);
3193}
3194
3195static void v9fs_fs_ro(void *opaque)
3196{
3197 V9fsPDU *pdu = opaque;
3198 complete_pdu(pdu->s, pdu, -EROFS30);
3199}
3200
3201static inline bool_Bool is_read_only_op(V9fsPDU *pdu)
3202{
3203 switch (pdu->id) {
3204 case P9_TREADDIR:
3205 case P9_TSTATFS:
3206 case P9_TGETATTR:
3207 case P9_TXATTRWALK:
3208 case P9_TLOCK:
3209 case P9_TGETLOCK:
3210 case P9_TREADLINK:
3211 case P9_TVERSION:
3212 case P9_TLOPEN:
3213 case P9_TATTACH:
3214 case P9_TSTAT:
3215 case P9_TWALK:
3216 case P9_TCLUNK:
3217 case P9_TFSYNC:
3218 case P9_TOPEN:
3219 case P9_TREAD:
3220 case P9_TAUTH:
3221 case P9_TFLUSH:
3222 return 1;
3223 default:
3224 return 0;
3225 }
3226}
3227
3228static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3229{
3230 Coroutine *co;
3231 CoroutineEntry *handler;
3232
3233 if (pdu->id >= ARRAY_SIZE(pdu_co_handlers)(sizeof(pdu_co_handlers) / sizeof((pdu_co_handlers)[0])) ||
3234 (pdu_co_handlers[pdu->id] == NULL((void*)0))) {
3235 handler = v9fs_op_not_supp;
3236 } else {
3237 handler = pdu_co_handlers[pdu->id];
3238 }
3239
3240 if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) {
3241 handler = v9fs_fs_ro;
3242 }
3243 co = qemu_coroutine_create(handler);
3244 qemu_coroutine_enter(co, pdu);
3245}
3246
3247void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3248{
3249 V9fsState *s = (V9fsState *)vdev;
3250 V9fsPDU *pdu;
3251 ssize_t len;
3252
3253 while ((pdu = alloc_pdu(s)) &&
3254 (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
3255 uint8_t *ptr;
3256 pdu->s = s;
3257 BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0)((!(pdu->elem.out_num == 0 || pdu->elem.in_num == 0)) ?
(void) (0) : __assert_fail ("!(pdu->elem.out_num == 0 || pdu->elem.in_num == 0)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 3257
, __PRETTY_FUNCTION__));
3258 BUG_ON(pdu->elem.out_sg[0].iov_len < 7)((!(pdu->elem.out_sg[0].iov_len < 7)) ? (void) (0) : __assert_fail
("!(pdu->elem.out_sg[0].iov_len < 7)", "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c"
, 3258, __PRETTY_FUNCTION__));
3259
3260 ptr = pdu->elem.out_sg[0].iov_base;
3261
3262 pdu->size = le32_to_cpu(*(uint32_t *)ptr);
3263 pdu->id = ptr[4];
3264 pdu->tag = le16_to_cpu(*(uint16_t *)(ptr + 5));
3265 qemu_co_queue_init(&pdu->complete);
3266 submit_pdu(s, pdu);
3267 }
3268 free_pdu(s, pdu);
3269}
3270
3271static void __attribute__((__constructor__)) virtio_9p_set_fd_limit(void)
3272{
3273 struct rlimit rlim;
3274 if (getrlimit(RLIMIT_NOFILERLIMIT_NOFILE, &rlim) < 0) {
3275 fprintf(stderrstderr, "Failed to get the resource limit\n");
3276 exit(1);
3277 }
3278 open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3)(((400) < (rlim.rlim_cur/3)) ? (400) : (rlim.rlim_cur/3));
3279 open_fd_rc = rlim.rlim_cur/2;
3280}