Bug Summary

File:hw/9pfs/virtio-9p.c
Location:line 3257, column 14
Description:Although the value stored to 'len' is used in the enclosing expression, the value is never actually read from 'len'

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.h"
15#include "hw/pc.h"
16#include "qemu_socket.h"
17#include "hw/virtio-pci.h"
18#include "virtio-9p.h"
19#include "fsdev/qemu-fsdev.h"
20#include "virtio-9p-xattr.h"
21#include "virtio-9p-coth.h"
22#include "trace.h"
23#include "migration.h"
24
25int open_fd_hw;
26int total_open_fd;
27static int open_fd_rc;
28
29enum {
30 Oread = 0x00,
31 Owrite = 0x01,
32 Ordwr = 0x02,
33 Oexec = 0x03,
34 Oexcl = 0x04,
35 Otrunc = 0x10,
36 Orexec = 0x20,
37 Orclose = 0x40,
38 Oappend = 0x80,
39};
40
41static int omode_to_uflags(int8_t mode)
42{
43 int ret = 0;
44
45 switch (mode & 3) {
46 case Oread:
47 ret = O_RDONLY00;
48 break;
49 case Ordwr:
50 ret = O_RDWR02;
51 break;
52 case Owrite:
53 ret = O_WRONLY01;
54 break;
55 case Oexec:
56 ret = O_RDONLY00;
57 break;
58 }
59
60 if (mode & Otrunc) {
61 ret |= O_TRUNC01000;
62 }
63
64 if (mode & Oappend) {
65 ret |= O_APPEND02000;
66 }
67
68 if (mode & Oexcl) {
69 ret |= O_EXCL0200;
70 }
71
72 return ret;
73}
74
75struct dotl_openflag_map {
76 int dotl_flag;
77 int open_flag;
78};
79
80static int dotl_to_open_flags(int flags)
81{
82 int i;
83 /*
84 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
85 * and P9_DOTL_NOACCESS
86 */
87 int oflags = flags & O_ACCMODE0003;
88
89 struct dotl_openflag_map dotl_oflag_map[] = {
90 { P9_DOTL_CREATE00000100, O_CREAT0100 },
91 { P9_DOTL_EXCL00000200, O_EXCL0200 },
92 { P9_DOTL_NOCTTY00000400 , O_NOCTTY0400 },
93 { P9_DOTL_TRUNC00001000, O_TRUNC01000 },
94 { P9_DOTL_APPEND00002000, O_APPEND02000 },
95 { P9_DOTL_NONBLOCK00004000, O_NONBLOCK04000 } ,
96 { P9_DOTL_DSYNC00010000, O_DSYNC010000 },
97 { P9_DOTL_FASYNC00020000, FASYNC020000 },
98 { P9_DOTL_DIRECT00040000, O_DIRECT040000 },
99 { P9_DOTL_LARGEFILE00100000, O_LARGEFILE0 },
100 { P9_DOTL_DIRECTORY00200000, O_DIRECTORY0200000 },
101 { P9_DOTL_NOFOLLOW00400000, O_NOFOLLOW0400000 },
102 { P9_DOTL_NOATIME01000000, O_NOATIME01000000 },
103 { P9_DOTL_SYNC04000000, O_SYNC010000 },
104 };
105
106 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map)(sizeof(dotl_oflag_map) / sizeof((dotl_oflag_map)[0])); i++) {
107 if (flags & dotl_oflag_map[i].dotl_flag) {
108 oflags |= dotl_oflag_map[i].open_flag;
109 }
110 }
111
112 return oflags;
113}
114
115void cred_init(FsCred *credp)
116{
117 credp->fc_uid = -1;
118 credp->fc_gid = -1;
119 credp->fc_mode = -1;
120 credp->fc_rdev = -1;
121}
122
123static int get_dotl_openflags(V9fsState *s, int oflags)
124{
125 int flags;
126 /*
127 * Filter the client open flags
128 */
129 flags = dotl_to_open_flags(oflags);
130 flags &= ~(O_NOCTTY0400 | O_ASYNC020000 | O_CREAT0100);
131 /*
132 * Ignore direct disk access hint until the server supports it.
133 */
134 flags &= ~O_DIRECT040000;
135 return flags;
136}
137
138void v9fs_path_init(V9fsPath *path)
139{
140 path->data = NULL((void*)0);
141 path->size = 0;
142}
143
144void v9fs_path_free(V9fsPath *path)
145{
146 g_free(path->data);
147 path->data = NULL((void*)0);
148 path->size = 0;
149}
150
151void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs)
152{
153 v9fs_path_free(lhs);
154 lhs->data = g_malloc(rhs->size);
155 memcpy(lhs->data, rhs->data, rhs->size);
156 lhs->size = rhs->size;
157}
158
159int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
160 const char *name, V9fsPath *path)
161{
162 int err;
163 err = s->ops->name_to_path(&s->ctx, dirpath, name, path);
164 if (err < 0) {
165 err = -errno(*__errno_location ());
166 }
167 return err;
168}
169
170/*
171 * Return TRUE if s1 is an ancestor of s2.
172 *
173 * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
174 * As a special case, We treat s1 as ancestor of s2 if they are same!
175 */
176static int v9fs_path_is_ancestor(V9fsPath *s1, V9fsPath *s2)
177{
178 if (!strncmp(s1->data, s2->data, s1->size - 1)) {
179 if (s2->data[s1->size - 1] == '\0' || s2->data[s1->size - 1] == '/') {
180 return 1;
181 }
182 }
183 return 0;
184}
185
186static size_t v9fs_string_size(V9fsString *str)
187{
188 return str->size;
189}
190
191/*
192 * returns 0 if fid got re-opened, 1 if not, < 0 on error */
193static int v9fs_reopen_fid(V9fsPDU *pdu, V9fsFidState *f)
194{
195 int err = 1;
196 if (f->fid_type == P9_FID_FILE) {
197 if (f->fs.fd == -1) {
198 do {
199 err = v9fs_co_open(pdu, f, f->open_flags);
200 } while (err == -EINTR4 && !pdu->cancelled);
201 }
202 } else if (f->fid_type == P9_FID_DIR) {
203 if (f->fs.dir == NULL((void*)0)) {
204 do {
205 err = v9fs_co_opendir(pdu, f);
206 } while (err == -EINTR4 && !pdu->cancelled);
207 }
208 }
209 return err;
210}
211
212static V9fsFidState *get_fid(V9fsPDU *pdu, int32_t fid)
213{
214 int err;
215 V9fsFidState *f;
216 V9fsState *s = pdu->s;
217
218 for (f = s->fid_list; f; f = f->next) {
219 BUG_ON(f->clunked)((!(f->clunked)) ? (void) (0) : __assert_fail ("!(f->clunked)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 219
, __PRETTY_FUNCTION__));
220 if (f->fid == fid) {
221 /*
222 * Update the fid ref upfront so that
223 * we don't get reclaimed when we yield
224 * in open later.
225 */
226 f->ref++;
227 /*
228 * check whether we need to reopen the
229 * file. We might have closed the fd
230 * while trying to free up some file
231 * descriptors.
232 */
233 err = v9fs_reopen_fid(pdu, f);
234 if (err < 0) {
235 f->ref--;
236 return NULL((void*)0);
237 }
238 /*
239 * Mark the fid as referenced so that the LRU
240 * reclaim won't close the file descriptor
241 */
242 f->flags |= FID_REFERENCED0x1;
243 return f;
244 }
245 }
246 return NULL((void*)0);
247}
248
249static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
250{
251 V9fsFidState *f;
252
253 for (f = s->fid_list; f; f = f->next) {
254 /* If fid is already there return NULL */
255 BUG_ON(f->clunked)((!(f->clunked)) ? (void) (0) : __assert_fail ("!(f->clunked)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 255
, __PRETTY_FUNCTION__));
256 if (f->fid == fid) {
257 return NULL((void*)0);
258 }
259 }
260 f = g_malloc0(sizeof(V9fsFidState));
261 f->fid = fid;
262 f->fid_type = P9_FID_NONE;
263 f->ref = 1;
264 /*
265 * Mark the fid as referenced so that the LRU
266 * reclaim won't close the file descriptor
267 */
268 f->flags |= FID_REFERENCED0x1;
269 f->next = s->fid_list;
270 s->fid_list = f;
271
272 return f;
273}
274
275static int v9fs_xattr_fid_clunk(V9fsPDU *pdu, V9fsFidState *fidp)
276{
277 int retval = 0;
278
279 if (fidp->fs.xattr.copied_len == -1) {
280 /* getxattr/listxattr fid */
281 goto free_value;
282 }
283 /*
284 * if this is fid for setxattr. clunk should
285 * result in setxattr localcall
286 */
287 if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
288 /* clunk after partial write */
289 retval = -EINVAL22;
290 goto free_out;
291 }
292 if (fidp->fs.xattr.len) {
293 retval = v9fs_co_lsetxattr(pdu, &fidp->path, &fidp->fs.xattr.name,
294 fidp->fs.xattr.value,
295 fidp->fs.xattr.len,
296 fidp->fs.xattr.flags);
297 } else {
298 retval = v9fs_co_lremovexattr(pdu, &fidp->path, &fidp->fs.xattr.name);
299 }
300free_out:
301 v9fs_string_free(&fidp->fs.xattr.name);
302free_value:
303 if (fidp->fs.xattr.value) {
304 g_free(fidp->fs.xattr.value);
305 }
306 return retval;
307}
308
309static int free_fid(V9fsPDU *pdu, V9fsFidState *fidp)
310{
311 int retval = 0;
312
313 if (fidp->fid_type == P9_FID_FILE) {
314 /* If we reclaimed the fd no need to close */
315 if (fidp->fs.fd != -1) {
316 retval = v9fs_co_close(pdu, &fidp->fs);
317 }
318 } else if (fidp->fid_type == P9_FID_DIR) {
319 if (fidp->fs.dir != NULL((void*)0)) {
320 retval = v9fs_co_closedir(pdu, &fidp->fs);
321 }
322 } else if (fidp->fid_type == P9_FID_XATTR) {
323 retval = v9fs_xattr_fid_clunk(pdu, fidp);
324 }
325 v9fs_path_free(&fidp->path);
326 g_free(fidp);
327 return retval;
328}
329
330static void put_fid(V9fsPDU *pdu, V9fsFidState *fidp)
331{
332 BUG_ON(!fidp->ref)((!(!fidp->ref)) ? (void) (0) : __assert_fail ("!(!fidp->ref)"
, "/home/stefan/src/qemu/qemu.org/qemu/hw/9pfs/virtio-9p.c", 332
, __PRETTY_FUNCTION__));
333 fidp->ref--;
334 /*
335 * Don't free the fid if it is in reclaim list
336 */
337 if (!fidp->ref && fidp->clunked) {
338 if (fidp->fid == pdu->s->root_fid) {
339 /*
340 * if the clunked fid is root fid then we
341 * have unmounted the fs on the client side.
342 * delete the migration blocker. Ideally, this
343 * should be hooked to transport close notification
344 */
345 if (pdu->s->migration_blocker) {
346 migrate_del_blocker(pdu->s->migration_blocker);
347 error_free(pdu->s->migration_blocker);
348 pdu->s->migration_blocker = NULL((void*)0);
349 }
350 }
351 free_fid(pdu, fidp);
352 }
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 return;
509}
510
511#define P9_QID_TYPE_DIR0x80 0x80
512#define P9_QID_TYPE_SYMLINK0x02 0x02
513
514#define P9_STAT_MODE_DIR0x80000000 0x80000000
515#define P9_STAT_MODE_APPEND0x40000000 0x40000000
516#define P9_STAT_MODE_EXCL0x20000000 0x20000000
517#define P9_STAT_MODE_MOUNT0x10000000 0x10000000
518#define P9_STAT_MODE_AUTH0x08000000 0x08000000
519#define P9_STAT_MODE_TMP0x04000000 0x04000000
520#define P9_STAT_MODE_SYMLINK0x02000000 0x02000000
521#define P9_STAT_MODE_LINK0x01000000 0x01000000
522#define P9_STAT_MODE_DEVICE0x00800000 0x00800000
523#define P9_STAT_MODE_NAMED_PIPE0x00200000 0x00200000
524#define P9_STAT_MODE_SOCKET0x00100000 0x00100000
525#define P9_STAT_MODE_SETUID0x00080000 0x00080000
526#define P9_STAT_MODE_SETGID0x00040000 0x00040000
527#define P9_STAT_MODE_SETVTX0x00010000 0x00010000
528
529#define P9_STAT_MODE_TYPE_BITS(0x80000000 | 0x02000000 | 0x01000000 | 0x00800000 | 0x00200000
| 0x00100000) (P9_STAT_MODE_DIR0x80000000 | \
530 P9_STAT_MODE_SYMLINK0x02000000 | \
531 P9_STAT_MODE_LINK0x01000000 | \
532 P9_STAT_MODE_DEVICE0x00800000 | \
533 P9_STAT_MODE_NAMED_PIPE0x00200000 | \
534 P9_STAT_MODE_SOCKET0x00100000)
535
536/* This is the algorithm from ufs in spfs */
537static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
538{
539 size_t size;
540
541 memset(&qidp->path, 0, sizeof(qidp->path));
542 size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path))(((sizeof(stbuf->st_ino)) < (sizeof(qidp->path))) ? (
sizeof(stbuf->st_ino)) : (sizeof(qidp->path)));
543 memcpy(&qidp->path, &stbuf->st_ino, size);
544 qidp->version = stbuf->st_mtimest_mtim.tv_sec ^ (stbuf->st_size << 8);
545 qidp->type = 0;
546 if (S_ISDIR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0040000))) {
547 qidp->type |= P9_QID_TYPE_DIR0x80;
548 }
549 if (S_ISLNK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0120000))) {
550 qidp->type |= P9_QID_TYPE_SYMLINK0x02;
551 }
552}
553
554static int fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp, V9fsQID *qidp)
555{
556 struct stat stbuf;
557 int err;
558
559 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
560 if (err < 0) {
561 return err;
562 }
563 stat_to_qid(&stbuf, qidp);
564 return 0;
565}
566
567static V9fsPDU *alloc_pdu(V9fsState *s)
568{
569 V9fsPDU *pdu = NULL((void*)0);
570
571 if (!QLIST_EMPTY(&s->free_list)((&s->free_list)->lh_first == ((void*)0))) {
572 pdu = QLIST_FIRST(&s->free_list)((&s->free_list)->lh_first);
573 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);
574 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);
575 }
576 return pdu;
577}
578
579static void free_pdu(V9fsState *s, V9fsPDU *pdu)
580{
581 if (pdu) {
582 /*
583 * Cancelled pdu are added back to the freelist
584 * by flush request .
585 */
586 if (!pdu->cancelled) {
587 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);
588 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);
589 }
590 }
591}
592
593/*
594 * We don't do error checking for pdu_marshal/unmarshal here
595 * because we always expect to have enough space to encode
596 * error details
597 */
598static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
599{
600 int8_t id = pdu->id + 1; /* Response */
601
602 if (len < 0) {
603 int err = -len;
604 len = 7;
605
606 if (s->proto_version != V9FS_PROTO_2000L) {
607 V9fsString str;
608
609 str.data = strerror(err);
610 str.size = strlen(str.data);
611
612 len += pdu_marshal(pdu, len, "s", &str)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, len, 1,
"s", &str);
613 id = P9_RERROR;
614 }
615
616 len += pdu_marshal(pdu, len, "d", err)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, len, 1,
"d", err);
617
618 if (s->proto_version == V9FS_PROTO_2000L) {
619 id = P9_RLERROR;
620 }
621 trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
622 }
623
624 /* fill out the header */
625 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);
626
627 /* keep these in sync */
628 pdu->size = len;
629 pdu->id = id;
630
631 /* push onto queue and notify */
632 virtqueue_push(s->vq, &pdu->elem, len);
633
634 /* FIXME: we should batch these completions */
635 virtio_notify(&s->vdev, s->vq);
636
637 /* Now wakeup anybody waiting in flush for this request */
638 qemu_co_queue_next(&pdu->complete);
639
640 free_pdu(s, pdu);
641}
642
643static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
644{
645 mode_t ret;
646
647 ret = mode & 0777;
648 if (mode & P9_STAT_MODE_DIR0x80000000) {
649 ret |= S_IFDIR0040000;
650 }
651
652 if (mode & P9_STAT_MODE_SYMLINK0x02000000) {
653 ret |= S_IFLNK0120000;
654 }
655 if (mode & P9_STAT_MODE_SOCKET0x00100000) {
656 ret |= S_IFSOCK0140000;
657 }
658 if (mode & P9_STAT_MODE_NAMED_PIPE0x00200000) {
659 ret |= S_IFIFO0010000;
660 }
661 if (mode & P9_STAT_MODE_DEVICE0x00800000) {
662 if (extension && extension->data[0] == 'c') {
663 ret |= S_IFCHR0020000;
664 } else {
665 ret |= S_IFBLK0060000;
666 }
667 }
668
669 if (!(ret&~0777)) {
670 ret |= S_IFREG0100000;
671 }
672
673 if (mode & P9_STAT_MODE_SETUID0x00080000) {
674 ret |= S_ISUID04000;
675 }
676 if (mode & P9_STAT_MODE_SETGID0x00040000) {
677 ret |= S_ISGID02000;
678 }
679 if (mode & P9_STAT_MODE_SETVTX0x00010000) {
680 ret |= S_ISVTX01000;
681 }
682
683 return ret;
684}
685
686static int donttouch_stat(V9fsStat *stat)
687{
688 if (stat->type == -1 &&
689 stat->dev == -1 &&
690 stat->qid.type == -1 &&
691 stat->qid.version == -1 &&
692 stat->qid.path == -1 &&
693 stat->mode == -1 &&
694 stat->atime == -1 &&
695 stat->mtime == -1 &&
696 stat->length == -1 &&
697 !stat->name.size &&
698 !stat->uid.size &&
699 !stat->gid.size &&
700 !stat->muid.size &&
701 stat->n_uid == -1 &&
702 stat->n_gid == -1 &&
703 stat->n_muid == -1) {
704 return 1;
705 }
706
707 return 0;
708}
709
710static void v9fs_stat_init(V9fsStat *stat)
711{
712 v9fs_string_init(&stat->name);
713 v9fs_string_init(&stat->uid);
714 v9fs_string_init(&stat->gid);
715 v9fs_string_init(&stat->muid);
716 v9fs_string_init(&stat->extension);
717}
718
719static void v9fs_stat_free(V9fsStat *stat)
720{
721 v9fs_string_free(&stat->name);
722 v9fs_string_free(&stat->uid);
723 v9fs_string_free(&stat->gid);
724 v9fs_string_free(&stat->muid);
725 v9fs_string_free(&stat->extension);
726}
727
728static uint32_t stat_to_v9mode(const struct stat *stbuf)
729{
730 uint32_t mode;
731
732 mode = stbuf->st_mode & 0777;
733 if (S_ISDIR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0040000))) {
734 mode |= P9_STAT_MODE_DIR0x80000000;
735 }
736
737 if (S_ISLNK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0120000))) {
738 mode |= P9_STAT_MODE_SYMLINK0x02000000;
739 }
740
741 if (S_ISSOCK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0140000))) {
742 mode |= P9_STAT_MODE_SOCKET0x00100000;
743 }
744
745 if (S_ISFIFO(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0010000))) {
746 mode |= P9_STAT_MODE_NAMED_PIPE0x00200000;
747 }
748
749 if (S_ISBLK(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0060000)) || S_ISCHR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0020000))) {
750 mode |= P9_STAT_MODE_DEVICE0x00800000;
751 }
752
753 if (stbuf->st_mode & S_ISUID04000) {
754 mode |= P9_STAT_MODE_SETUID0x00080000;
755 }
756
757 if (stbuf->st_mode & S_ISGID02000) {
758 mode |= P9_STAT_MODE_SETGID0x00040000;
759 }
760
761 if (stbuf->st_mode & S_ISVTX01000) {
762 mode |= P9_STAT_MODE_SETVTX0x00010000;
763 }
764
765 return mode;
766}
767
768static int stat_to_v9stat(V9fsPDU *pdu, V9fsPath *name,
769 const struct stat *stbuf,
770 V9fsStat *v9stat)
771{
772 int err;
773 const char *str;
774
775 memset(v9stat, 0, sizeof(*v9stat));
776
777 stat_to_qid(stbuf, &v9stat->qid);
778 v9stat->mode = stat_to_v9mode(stbuf);
779 v9stat->atime = stbuf->st_atimest_atim.tv_sec;
780 v9stat->mtime = stbuf->st_mtimest_mtim.tv_sec;
781 v9stat->length = stbuf->st_size;
782
783 v9fs_string_null(&v9stat->uid);
784 v9fs_string_null(&v9stat->gid);
785 v9fs_string_null(&v9stat->muid);
786
787 v9stat->n_uid = stbuf->st_uid;
788 v9stat->n_gid = stbuf->st_gid;
789 v9stat->n_muid = 0;
790
791 v9fs_string_null(&v9stat->extension);
792
793 if (v9stat->mode & P9_STAT_MODE_SYMLINK0x02000000) {
794 err = v9fs_co_readlink(pdu, name, &v9stat->extension);
795 if (err < 0) {
796 return err;
797 }
798 } else if (v9stat->mode & P9_STAT_MODE_DEVICE0x00800000) {
799 v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
800 S_ISCHR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0020000)) ? 'c' : 'b',
801 major(stbuf->st_rdev)gnu_dev_major (stbuf->st_rdev), minor(stbuf->st_rdev)gnu_dev_minor (stbuf->st_rdev));
802 } else if (S_ISDIR(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0040000)) || S_ISREG(stbuf->st_mode)((((stbuf->st_mode)) & 0170000) == (0100000))) {
803 v9fs_string_sprintf(&v9stat->extension, "%s %lu",
804 "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
805 }
806
807 str = strrchr(name->data, '/');
808 if (str) {
809 str += 1;
810 } else {
811 str = name->data;
812 }
813
814 v9fs_string_sprintf(&v9stat->name, "%s", str);
815
816 v9stat->size = 61 +
817 v9fs_string_size(&v9stat->name) +
818 v9fs_string_size(&v9stat->uid) +
819 v9fs_string_size(&v9stat->gid) +
820 v9fs_string_size(&v9stat->muid) +
821 v9fs_string_size(&v9stat->extension);
822 return 0;
823}
824
825#define P9_STATS_MODE0x00000001ULL 0x00000001ULL
826#define P9_STATS_NLINK0x00000002ULL 0x00000002ULL
827#define P9_STATS_UID0x00000004ULL 0x00000004ULL
828#define P9_STATS_GID0x00000008ULL 0x00000008ULL
829#define P9_STATS_RDEV0x00000010ULL 0x00000010ULL
830#define P9_STATS_ATIME0x00000020ULL 0x00000020ULL
831#define P9_STATS_MTIME0x00000040ULL 0x00000040ULL
832#define P9_STATS_CTIME0x00000080ULL 0x00000080ULL
833#define P9_STATS_INO0x00000100ULL 0x00000100ULL
834#define P9_STATS_SIZE0x00000200ULL 0x00000200ULL
835#define P9_STATS_BLOCKS0x00000400ULL 0x00000400ULL
836
837#define P9_STATS_BTIME0x00000800ULL 0x00000800ULL
838#define P9_STATS_GEN0x00001000ULL 0x00001000ULL
839#define P9_STATS_DATA_VERSION0x00002000ULL 0x00002000ULL
840
841#define P9_STATS_BASIC0x000007ffULL 0x000007ffULL /* Mask for fields up to BLOCKS */
842#define P9_STATS_ALL0x00003fffULL 0x00003fffULL /* Mask for All fields above */
843
844
845static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
846 V9fsStatDotl *v9lstat)
847{
848 memset(v9lstat, 0, sizeof(*v9lstat));
849
850 v9lstat->st_mode = stbuf->st_mode;
851 v9lstat->st_nlink = stbuf->st_nlink;
852 v9lstat->st_uid = stbuf->st_uid;
853 v9lstat->st_gid = stbuf->st_gid;
854 v9lstat->st_rdev = stbuf->st_rdev;
855 v9lstat->st_size = stbuf->st_size;
856 v9lstat->st_blksize = stbuf->st_blksize;
857 v9lstat->st_blocks = stbuf->st_blocks;
858 v9lstat->st_atime_sec = stbuf->st_atimest_atim.tv_sec;
859 v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
860 v9lstat->st_mtime_sec = stbuf->st_mtimest_mtim.tv_sec;
861 v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
862 v9lstat->st_ctime_sec = stbuf->st_ctimest_ctim.tv_sec;
863 v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
864 /* Currently we only support BASIC fields in stat */
865 v9lstat->st_result_mask = P9_STATS_BASIC0x000007ffULL;
866
867 stat_to_qid(stbuf, &v9lstat->qid);
868}
869
870static void print_sg(struct iovec *sg, int cnt)
871{
872 int i;
873
874 printf("sg[%d]: {", cnt);
875 for (i = 0; i < cnt; i++) {
876 if (i) {
877 printf(", ");
878 }
879 printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
880 }
881 printf("}\n");
882}
883
884/* Will call this only for path name based fid */
885static void v9fs_fix_path(V9fsPath *dst, V9fsPath *src, int len)
886{
887 V9fsPath str;
888 v9fs_path_init(&str);
889 v9fs_path_copy(&str, dst);
890 v9fs_string_sprintf((V9fsString *)dst, "%s%s", src->data, str.data+len);
891 v9fs_path_free(&str);
892 /* +1 to include terminating NULL */
893 dst->size++;
894}
895
896static inline bool_Bool is_ro_export(FsContext *ctx)
897{
898 return ctx->export_flags & V9FS_RDONLY0x00000040;
899}
900
901static void v9fs_version(void *opaque)
902{
903 ssize_t err;
904 V9fsPDU *pdu = opaque;
905 V9fsState *s = pdu->s;
906 V9fsString version;
907 size_t offset = 7;
908
909 v9fs_string_init(&version);
910 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);
911 if (err < 0) {
912 offset = err;
913 goto out;
914 }
915 trace_v9fs_version(pdu->tag, pdu->id, s->msize, version.data);
916
917 virtfs_reset(pdu);
918
919 if (!strcmp(version.data, "9P2000.u")) {
920 s->proto_version = V9FS_PROTO_2000U;
921 } else if (!strcmp(version.data, "9P2000.L")) {
922 s->proto_version = V9FS_PROTO_2000L;
923 } else {
924 v9fs_string_sprintf(&version, "unknown");
925 }
926
927 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);
928 if (err < 0) {
929 offset = err;
930 goto out;
931 }
932 offset += err;
933 trace_v9fs_version_return(pdu->tag, pdu->id, s->msize, version.data);
934out:
935 complete_pdu(s, pdu, offset);
936 v9fs_string_free(&version);
937 return;
938}
939
940static void v9fs_attach(void *opaque)
941{
942 V9fsPDU *pdu = opaque;
943 V9fsState *s = pdu->s;
944 int32_t fid, afid, n_uname;
945 V9fsString uname, aname;
946 V9fsFidState *fidp;
947 size_t offset = 7;
948 V9fsQID qid;
949 ssize_t err;
950
951 v9fs_string_init(&uname);
952 v9fs_string_init(&aname);
953 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)
954 &afid, &uname, &aname, &n_uname)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "ddssd", &fid, &afid, &uname, &aname, &
n_uname);
955 if (err < 0) {
956 goto out_nofid;
957 }
958 trace_v9fs_attach(pdu->tag, pdu->id, fid, afid, uname.data, aname.data);
959
960 fidp = alloc_fid(s, fid);
961 if (fidp == NULL((void*)0)) {
962 err = -EINVAL22;
963 goto out_nofid;
964 }
965 fidp->uid = n_uname;
966 err = v9fs_co_name_to_path(pdu, NULL((void*)0), "/", &fidp->path);
967 if (err < 0) {
968 err = -EINVAL22;
969 clunk_fid(s, fid);
970 goto out;
971 }
972 err = fid_to_qid(pdu, fidp, &qid);
973 if (err < 0) {
974 err = -EINVAL22;
975 clunk_fid(s, fid);
976 goto out;
977 }
978 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
979 if (err < 0) {
980 clunk_fid(s, fid);
981 goto out;
982 }
983 err += offset;
984 trace_v9fs_attach_return(pdu->tag, pdu->id,
985 qid.type, qid.version, qid.path);
986 s->root_fid = fid;
987 /* disable migration */
988 error_set(&s->migration_blocker, QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION"{ 'class': 'VirtFSFeatureBlocksMigration', 'data': { 'path': %s, 'tag': %s } }",
989 s->ctx.fs_root ? s->ctx.fs_root : "NULL", s->tag);
990 migrate_add_blocker(s->migration_blocker);
991out:
992 put_fid(pdu, fidp);
993out_nofid:
994 complete_pdu(s, pdu, err);
995 v9fs_string_free(&uname);
996 v9fs_string_free(&aname);
997}
998
999static void v9fs_stat(void *opaque)
1000{
1001 int32_t fid;
1002 V9fsStat v9stat;
1003 ssize_t err = 0;
1004 size_t offset = 7;
1005 struct stat stbuf;
1006 V9fsFidState *fidp;
1007 V9fsPDU *pdu = opaque;
1008 V9fsState *s = pdu->s;
1009
1010 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
1011 if (err < 0) {
1012 goto out_nofid;
1013 }
1014 trace_v9fs_stat(pdu->tag, pdu->id, fid);
1015
1016 fidp = get_fid(pdu, fid);
1017 if (fidp == NULL((void*)0)) {
1018 err = -ENOENT2;
1019 goto out_nofid;
1020 }
1021 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1022 if (err < 0) {
1023 goto out;
1024 }
1025 err = stat_to_v9stat(pdu, &fidp->path, &stbuf, &v9stat);
1026 if (err < 0) {
1027 goto out;
1028 }
1029 err = pdu_marshal(pdu, offset, "wS", 0, &v9stat)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "wS", 0, &v9stat);
1030 if (err < 0) {
1031 v9fs_stat_free(&v9stat);
1032 goto out;
1033 }
1034 trace_v9fs_stat_return(pdu->tag, pdu->id, v9stat.mode,
1035 v9stat.atime, v9stat.mtime, v9stat.length);
1036 err += offset;
1037 v9fs_stat_free(&v9stat);
1038out:
1039 put_fid(pdu, fidp);
1040out_nofid:
1041 complete_pdu(s, pdu, err);
1042}
1043
1044static void v9fs_getattr(void *opaque)
1045{
1046 int32_t fid;
1047 size_t offset = 7;
1048 ssize_t retval = 0;
1049 struct stat stbuf;
1050 V9fsFidState *fidp;
1051 uint64_t request_mask;
1052 V9fsStatDotl v9stat_dotl;
1053 V9fsPDU *pdu = opaque;
1054 V9fsState *s = pdu->s;
1055
1056 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);
1057 if (retval < 0) {
1058 goto out_nofid;
1059 }
1060 trace_v9fs_getattr(pdu->tag, pdu->id, fid, request_mask);
1061
1062 fidp = get_fid(pdu, fid);
1063 if (fidp == NULL((void*)0)) {
1064 retval = -ENOENT2;
1065 goto out_nofid;
1066 }
1067 /*
1068 * Currently we only support BASIC fields in stat, so there is no
1069 * need to look at request_mask.
1070 */
1071 retval = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1072 if (retval < 0) {
1073 goto out;
1074 }
1075 stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
1076
1077 /* fill st_gen if requested and supported by underlying fs */
1078 if (request_mask & P9_STATS_GEN0x00001000ULL) {
1079 retval = v9fs_co_st_gen(pdu, &fidp->path, stbuf.st_mode, &v9stat_dotl);
1080 if (retval < 0) {
1081 goto out;
1082 }
1083 v9stat_dotl.st_result_mask |= P9_STATS_GEN0x00001000ULL;
1084 }
1085 retval = pdu_marshal(pdu, offset, "A", &v9stat_dotl)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "A", &v9stat_dotl);
1086 if (retval < 0) {
1087 goto out;
1088 }
1089 retval += offset;
1090 trace_v9fs_getattr_return(pdu->tag, pdu->id, v9stat_dotl.st_result_mask,
1091 v9stat_dotl.st_mode, v9stat_dotl.st_uid,
1092 v9stat_dotl.st_gid);
1093out:
1094 put_fid(pdu, fidp);
1095out_nofid:
1096 complete_pdu(s, pdu, retval);
1097}
1098
1099/* Attribute flags */
1100#define P9_ATTR_MODE(1 << 0) (1 << 0)
1101#define P9_ATTR_UID(1 << 1) (1 << 1)
1102#define P9_ATTR_GID(1 << 2) (1 << 2)
1103#define P9_ATTR_SIZE(1 << 3) (1 << 3)
1104#define P9_ATTR_ATIME(1 << 4) (1 << 4)
1105#define P9_ATTR_MTIME(1 << 5) (1 << 5)
1106#define P9_ATTR_CTIME(1 << 6) (1 << 6)
1107#define P9_ATTR_ATIME_SET(1 << 7) (1 << 7)
1108#define P9_ATTR_MTIME_SET(1 << 8) (1 << 8)
1109
1110#define P9_ATTR_MASK127 127
1111
1112static void v9fs_setattr(void *opaque)
1113{
1114 int err = 0;
1115 int32_t fid;
1116 V9fsFidState *fidp;
1117 size_t offset = 7;
1118 V9fsIattr v9iattr;
1119 V9fsPDU *pdu = opaque;
1120 V9fsState *s = pdu->s;
1121
1122 err = pdu_unmarshal(pdu, offset, "dI", &fid, &v9iattr)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dI", &fid, &v9iattr);
1123 if (err < 0) {
1124 goto out_nofid;
1125 }
1126
1127 fidp = get_fid(pdu, fid);
1128 if (fidp == NULL((void*)0)) {
1129 err = -EINVAL22;
1130 goto out_nofid;
1131 }
1132 if (v9iattr.valid & P9_ATTR_MODE(1 << 0)) {
1133 err = v9fs_co_chmod(pdu, &fidp->path, v9iattr.mode);
1134 if (err < 0) {
1135 goto out;
1136 }
1137 }
1138 if (v9iattr.valid & (P9_ATTR_ATIME(1 << 4) | P9_ATTR_MTIME(1 << 5))) {
1139 struct timespec times[2];
1140 if (v9iattr.valid & P9_ATTR_ATIME(1 << 4)) {
1141 if (v9iattr.valid & P9_ATTR_ATIME_SET(1 << 7)) {
1142 times[0].tv_sec = v9iattr.atime_sec;
1143 times[0].tv_nsec = v9iattr.atime_nsec;
1144 } else {
1145 times[0].tv_nsec = UTIME_NOW((1l << 30) - 1l);
1146 }
1147 } else {
1148 times[0].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
1149 }
1150 if (v9iattr.valid & P9_ATTR_MTIME(1 << 5)) {
1151 if (v9iattr.valid & P9_ATTR_MTIME_SET(1 << 8)) {
1152 times[1].tv_sec = v9iattr.mtime_sec;
1153 times[1].tv_nsec = v9iattr.mtime_nsec;
1154 } else {
1155 times[1].tv_nsec = UTIME_NOW((1l << 30) - 1l);
1156 }
1157 } else {
1158 times[1].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
1159 }
1160 err = v9fs_co_utimensat(pdu, &fidp->path, times);
1161 if (err < 0) {
1162 goto out;
1163 }
1164 }
1165 /*
1166 * If the only valid entry in iattr is ctime we can call
1167 * chown(-1,-1) to update the ctime of the file
1168 */
1169 if ((v9iattr.valid & (P9_ATTR_UID(1 << 1) | P9_ATTR_GID(1 << 2))) ||
1170 ((v9iattr.valid & P9_ATTR_CTIME(1 << 6))
1171 && !((v9iattr.valid & P9_ATTR_MASK127) & ~P9_ATTR_CTIME(1 << 6)))) {
1172 if (!(v9iattr.valid & P9_ATTR_UID(1 << 1))) {
1173 v9iattr.uid = -1;
1174 }
1175 if (!(v9iattr.valid & P9_ATTR_GID(1 << 2))) {
1176 v9iattr.gid = -1;
1177 }
1178 err = v9fs_co_chown(pdu, &fidp->path, v9iattr.uid,
1179 v9iattr.gid);
1180 if (err < 0) {
1181 goto out;
1182 }
1183 }
1184 if (v9iattr.valid & (P9_ATTR_SIZE(1 << 3))) {
1185 err = v9fs_co_truncate(pdu, &fidp->path, v9iattr.size);
1186 if (err < 0) {
1187 goto out;
1188 }
1189 }
1190 err = offset;
1191out:
1192 put_fid(pdu, fidp);
1193out_nofid:
1194 complete_pdu(s, pdu, err);
1195}
1196
1197static int v9fs_walk_marshal(V9fsPDU *pdu, uint16_t nwnames, V9fsQID *qids)
1198{
1199 int i;
1200 ssize_t err;
1201 size_t offset = 7;
1202
1203 err = pdu_marshal(pdu, offset, "w", nwnames)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "w", nwnames);
1204 if (err < 0) {
1205 return err;
1206 }
1207 offset += err;
1208 for (i = 0; i < nwnames; i++) {
1209 err = pdu_marshal(pdu, offset, "Q", &qids[i])v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qids[i]);
1210 if (err < 0) {
1211 return err;
1212 }
1213 offset += err;
1214 }
1215 return offset;
1216}
1217
1218static void v9fs_walk(void *opaque)
1219{
1220 int name_idx;
1221 V9fsQID *qids = NULL((void*)0);
1222 int i, err = 0;
1223 V9fsPath dpath, path;
1224 uint16_t nwnames;
1225 struct stat stbuf;
1226 size_t offset = 7;
1227 int32_t fid, newfid;
1228 V9fsString *wnames = NULL((void*)0);
1229 V9fsFidState *fidp;
1230 V9fsFidState *newfidp = NULL((void*)0);
1231 V9fsPDU *pdu = opaque;
1232 V9fsState *s = pdu->s;
1233
1234 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);
1235 if (err < 0) {
1236 complete_pdu(s, pdu, err);
1237 return ;
1238 }
1239 offset += err;
1240
1241 trace_v9fs_walk(pdu->tag, pdu->id, fid, newfid, nwnames);
1242
1243 if (nwnames && nwnames <= P9_MAXWELEM16) {
1244 wnames = g_malloc0(sizeof(wnames[0]) * nwnames);
1245 qids = g_malloc0(sizeof(qids[0]) * nwnames);
1246 for (i = 0; i < nwnames; i++) {
1247 err = pdu_unmarshal(pdu, offset, "s", &wnames[i])v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "s", &wnames[i]);
1248 if (err < 0) {
1249 goto out_nofid;
1250 }
1251 offset += err;
1252 }
1253 } else if (nwnames > P9_MAXWELEM16) {
1254 err = -EINVAL22;
1255 goto out_nofid;
1256 }
1257 fidp = get_fid(pdu, fid);
1258 if (fidp == NULL((void*)0)) {
1259 err = -ENOENT2;
1260 goto out_nofid;
1261 }
1262 v9fs_path_init(&dpath);
1263 v9fs_path_init(&path);
1264 /*
1265 * Both dpath and path initially poin to fidp.
1266 * Needed to handle request with nwnames == 0
1267 */
1268 v9fs_path_copy(&dpath, &fidp->path);
1269 v9fs_path_copy(&path, &fidp->path);
1270 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1271 err = v9fs_co_name_to_path(pdu, &dpath, wnames[name_idx].data, &path);
1272 if (err < 0) {
1273 goto out;
1274 }
1275 err = v9fs_co_lstat(pdu, &path, &stbuf);
1276 if (err < 0) {
1277 goto out;
1278 }
1279 stat_to_qid(&stbuf, &qids[name_idx]);
1280 v9fs_path_copy(&dpath, &path);
1281 }
1282 if (fid == newfid) {
1283 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"
, 1283, __PRETTY_FUNCTION__));
1284 v9fs_path_copy(&fidp->path, &path);
1285 } else {
1286 newfidp = alloc_fid(s, newfid);
1287 if (newfidp == NULL((void*)0)) {
1288 err = -EINVAL22;
1289 goto out;
1290 }
1291 newfidp->uid = fidp->uid;
1292 v9fs_path_copy(&newfidp->path, &path);
1293 }
1294 err = v9fs_walk_marshal(pdu, nwnames, qids);
1295 trace_v9fs_walk_return(pdu->tag, pdu->id, nwnames, qids);
1296out:
1297 put_fid(pdu, fidp);
1298 if (newfidp) {
1299 put_fid(pdu, newfidp);
1300 }
1301 v9fs_path_free(&dpath);
1302 v9fs_path_free(&path);
1303out_nofid:
1304 complete_pdu(s, pdu, err);
1305 if (nwnames && nwnames <= P9_MAXWELEM16) {
1306 for (name_idx = 0; name_idx < nwnames; name_idx++) {
1307 v9fs_string_free(&wnames[name_idx]);
1308 }
1309 g_free(wnames);
1310 g_free(qids);
1311 }
1312 return;
1313}
1314
1315static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
1316{
1317 struct statfs stbuf;
1318 int32_t iounit = 0;
1319 V9fsState *s = pdu->s;
1320
1321 /*
1322 * iounit should be multiples of f_bsize (host filesystem block size
1323 * and as well as less than (client msize - P9_IOHDRSZ))
1324 */
1325 if (!v9fs_co_statfs(pdu, path, &stbuf)) {
1326 iounit = stbuf.f_bsize;
1327 iounit *= (s->msize - P9_IOHDRSZ24)/stbuf.f_bsize;
1328 }
1329 if (!iounit) {
1330 iounit = s->msize - P9_IOHDRSZ24;
1331 }
1332 return iounit;
1333}
1334
1335static void v9fs_open(void *opaque)
1336{
1337 int flags;
1338 int32_t fid;
1339 int32_t mode;
1340 V9fsQID qid;
1341 int iounit = 0;
1342 ssize_t err = 0;
1343 size_t offset = 7;
1344 struct stat stbuf;
1345 V9fsFidState *fidp;
1346 V9fsPDU *pdu = opaque;
1347 V9fsState *s = pdu->s;
1348
1349 if (s->proto_version == V9FS_PROTO_2000L) {
1350 err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dd", &fid, &mode);
1351 } else {
1352 uint8_t modebyte;
1353 err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "db", &fid, &modebyte);
1354 mode = modebyte;
1355 }
1356 if (err < 0) {
1357 goto out_nofid;
1358 }
1359 trace_v9fs_open(pdu->tag, pdu->id, fid, mode);
1360
1361 fidp = get_fid(pdu, fid);
1362 if (fidp == NULL((void*)0)) {
1363 err = -ENOENT2;
1364 goto out_nofid;
1365 }
1366 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"
, 1366, __PRETTY_FUNCTION__));
1367
1368 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
1369 if (err < 0) {
1370 goto out;
1371 }
1372 stat_to_qid(&stbuf, &qid);
1373 if (S_ISDIR(stbuf.st_mode)((((stbuf.st_mode)) & 0170000) == (0040000))) {
1374 err = v9fs_co_opendir(pdu, fidp);
1375 if (err < 0) {
1376 goto out;
1377 }
1378 fidp->fid_type = P9_FID_DIR;
1379 err = pdu_marshal(pdu, offset, "Qd", &qid, 0)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, 0);
1380 if (err < 0) {
1381 goto out;
1382 }
1383 err += offset;
1384 } else {
1385 if (s->proto_version == V9FS_PROTO_2000L) {
1386 flags = get_dotl_openflags(s, mode);
1387 } else {
1388 flags = omode_to_uflags(mode);
1389 }
1390 if (is_ro_export(&s->ctx)) {
1391 if (mode & O_WRONLY01 || mode & O_RDWR02 ||
1392 mode & O_APPEND02000 || mode & O_TRUNC01000) {
1393 err = -EROFS30;
1394 goto out;
1395 }
1396 }
1397 err = v9fs_co_open(pdu, fidp, flags);
1398 if (err < 0) {
1399 goto out;
1400 }
1401 fidp->fid_type = P9_FID_FILE;
1402 fidp->open_flags = flags;
1403 if (flags & O_EXCL0200) {
1404 /*
1405 * We let the host file system do O_EXCL check
1406 * We should not reclaim such fd
1407 */
1408 fidp->flags |= FID_NON_RECLAIMABLE0x2;
1409 }
1410 iounit = get_iounit(pdu, &fidp->path);
1411 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, iounit);
1412 if (err < 0) {
1413 goto out;
1414 }
1415 err += offset;
1416 }
1417 trace_v9fs_open_return(pdu->tag, pdu->id,
1418 qid.type, qid.version, qid.path, iounit);
1419out:
1420 put_fid(pdu, fidp);
1421out_nofid:
1422 complete_pdu(s, pdu, err);
1423}
1424
1425static void v9fs_lcreate(void *opaque)
1426{
1427 int32_t dfid, flags, mode;
1428 gid_t gid;
1429 ssize_t err = 0;
1430 ssize_t offset = 7;
1431 V9fsString name;
1432 V9fsFidState *fidp;
1433 struct stat stbuf;
1434 V9fsQID qid;
1435 int32_t iounit;
1436 V9fsPDU *pdu = opaque;
1437
1438 v9fs_string_init(&name);
1439 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)
1440 &name, &flags, &mode, &gid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsddd", &dfid, &name, &flags, &mode, &
gid);
1441 if (err < 0) {
1442 goto out_nofid;
1443 }
1444 trace_v9fs_lcreate(pdu->tag, pdu->id, dfid, flags, mode, gid);
1445
1446 fidp = get_fid(pdu, dfid);
1447 if (fidp == NULL((void*)0)) {
1448 err = -ENOENT2;
1449 goto out_nofid;
1450 }
1451
1452 flags = get_dotl_openflags(pdu->s, flags);
1453 err = v9fs_co_open2(pdu, fidp, &name, gid,
1454 flags | O_CREAT0100, mode, &stbuf);
1455 if (err < 0) {
1456 goto out;
1457 }
1458 fidp->fid_type = P9_FID_FILE;
1459 fidp->open_flags = flags;
1460 if (flags & O_EXCL0200) {
1461 /*
1462 * We let the host file system do O_EXCL check
1463 * We should not reclaim such fd
1464 */
1465 fidp->flags |= FID_NON_RECLAIMABLE0x2;
1466 }
1467 iounit = get_iounit(pdu, &fidp->path);
1468 stat_to_qid(&stbuf, &qid);
1469 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, iounit);
1470 if (err < 0) {
1471 goto out;
1472 }
1473 err += offset;
1474 trace_v9fs_lcreate_return(pdu->tag, pdu->id,
1475 qid.type, qid.version, qid.path, iounit);
1476out:
1477 put_fid(pdu, fidp);
1478out_nofid:
1479 complete_pdu(pdu->s, pdu, err);
1480 v9fs_string_free(&name);
1481}
1482
1483static void v9fs_fsync(void *opaque)
1484{
1485 int err;
1486 int32_t fid;
1487 int datasync;
1488 size_t offset = 7;
1489 V9fsFidState *fidp;
1490 V9fsPDU *pdu = opaque;
1491 V9fsState *s = pdu->s;
1492
1493 err = pdu_unmarshal(pdu, offset, "dd", &fid, &datasync)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dd", &fid, &datasync);
1494 if (err < 0) {
1495 goto out_nofid;
1496 }
1497 trace_v9fs_fsync(pdu->tag, pdu->id, fid, datasync);
1498
1499 fidp = get_fid(pdu, fid);
1500 if (fidp == NULL((void*)0)) {
1501 err = -ENOENT2;
1502 goto out_nofid;
1503 }
1504 err = v9fs_co_fsync(pdu, fidp, datasync);
1505 if (!err) {
1506 err = offset;
1507 }
1508 put_fid(pdu, fidp);
1509out_nofid:
1510 complete_pdu(s, pdu, err);
1511}
1512
1513static void v9fs_clunk(void *opaque)
1514{
1515 int err;
1516 int32_t fid;
1517 size_t offset = 7;
1518 V9fsFidState *fidp;
1519 V9fsPDU *pdu = opaque;
1520 V9fsState *s = pdu->s;
1521
1522 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
1523 if (err < 0) {
1524 goto out_nofid;
1525 }
1526 trace_v9fs_clunk(pdu->tag, pdu->id, fid);
1527
1528 fidp = clunk_fid(s, fid);
1529 if (fidp == NULL((void*)0)) {
1530 err = -ENOENT2;
1531 goto out_nofid;
1532 }
1533 /*
1534 * Bump the ref so that put_fid will
1535 * free the fid.
1536 */
1537 fidp->ref++;
1538 err = offset;
1539
1540 put_fid(pdu, fidp);
1541out_nofid:
1542 complete_pdu(s, pdu, err);
1543}
1544
1545static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1546 uint64_t off, uint32_t max_count)
1547{
1548 ssize_t err;
1549 size_t offset = 7;
1550 int read_count;
1551 int64_t xattr_len;
1552
1553 xattr_len = fidp->fs.xattr.len;
1554 read_count = xattr_len - off;
1555 if (read_count > max_count) {
1556 read_count = max_count;
1557 } else if (read_count < 0) {
1558 /*
1559 * read beyond XATTR value
1560 */
1561 read_count = 0;
1562 }
1563 err = pdu_marshal(pdu, offset, "d", read_count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", read_count);
1564 if (err < 0) {
1565 return err;
1566 }
1567 offset += err;
1568 err = v9fs_pack(pdu->elem.in_sg, pdu->elem.in_num, offset,
1569 ((char *)fidp->fs.xattr.value) + off,
1570 read_count);
1571 if (err < 0) {
1572 return err;
1573 }
1574 offset += err;
1575 return offset;
1576}
1577
1578static int v9fs_do_readdir_with_stat(V9fsPDU *pdu,
1579 V9fsFidState *fidp, uint32_t max_count)
1580{
1581 V9fsPath path;
1582 V9fsStat v9stat;
1583 int len, err = 0;
1584 int32_t count = 0;
1585 struct stat stbuf;
1586 off_t saved_dir_pos;
1587 struct dirent *dent, *result;
1588
1589 /* save the directory position */
1590 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1591 if (saved_dir_pos < 0) {
1592 return saved_dir_pos;
1593 }
1594
1595 dent = g_malloc(sizeof(struct dirent));
1596
1597 while (1) {
1598 v9fs_path_init(&path);
1599 err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
1600 if (err || !result) {
1601 break;
1602 }
1603 err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
1604 if (err < 0) {
1605 goto out;
1606 }
1607 err = v9fs_co_lstat(pdu, &path, &stbuf);
1608 if (err < 0) {
1609 goto out;
1610 }
1611 err = stat_to_v9stat(pdu, &path, &stbuf, &v9stat);
1612 if (err < 0) {
1613 goto out;
1614 }
1615 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1616 len = pdu_marshal(pdu, 11 + count, "S", &v9stat)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, 11 + count
, 1, "S", &v9stat);
1617 if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
1618 /* Ran out of buffer. Set dir back to old position and return */
1619 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1620 v9fs_stat_free(&v9stat);
1621 v9fs_path_free(&path);
1622 g_free(dent);
1623 return count;
1624 }
1625 count += len;
1626 v9fs_stat_free(&v9stat);
1627 v9fs_path_free(&path);
1628 saved_dir_pos = dent->d_off;
1629 }
1630out:
1631 g_free(dent);
1632 v9fs_path_free(&path);
1633 if (err < 0) {
1634 return err;
1635 }
1636 return count;
1637}
1638
1639/*
1640 * Create a QEMUIOVector for a sub-region of PDU iovecs
1641 *
1642 * @qiov: uninitialized QEMUIOVector
1643 * @skip: number of bytes to skip from beginning of PDU
1644 * @size: number of bytes to include
1645 * @is_write: true - write, false - read
1646 *
1647 * The resulting QEMUIOVector has heap-allocated iovecs and must be cleaned up
1648 * with qemu_iovec_destroy().
1649 */
1650static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
1651 uint64_t skip, size_t size,
1652 bool_Bool is_write)
1653{
1654 QEMUIOVector elem;
1655 struct iovec *iov;
1656 unsigned int niov;
1657
1658 if (is_write) {
1659 iov = pdu->elem.out_sg;
1660 niov = pdu->elem.out_num;
1661 } else {
1662 iov = pdu->elem.in_sg;
1663 niov = pdu->elem.in_num;
1664 }
1665
1666 qemu_iovec_init_external(&elem, iov, niov);
1667 qemu_iovec_init(qiov, niov);
1668 qemu_iovec_copy(qiov, &elem, skip, size);
1669}
1670
1671static void v9fs_read(void *opaque)
1672{
1673 int32_t fid;
1674 uint64_t off;
1675 ssize_t err = 0;
1676 int32_t count = 0;
1677 size_t offset = 7;
1678 uint32_t max_count;
1679 V9fsFidState *fidp;
1680 V9fsPDU *pdu = opaque;
1681 V9fsState *s = pdu->s;
1682
1683 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);
1684 if (err < 0) {
1685 goto out_nofid;
1686 }
1687 trace_v9fs_read(pdu->tag, pdu->id, fid, off, max_count);
1688
1689 fidp = get_fid(pdu, fid);
1690 if (fidp == NULL((void*)0)) {
1691 err = -EINVAL22;
1692 goto out_nofid;
1693 }
1694 if (fidp->fid_type == P9_FID_DIR) {
1695
1696 if (off == 0) {
1697 v9fs_co_rewinddir(pdu, fidp);
1698 }
1699 count = v9fs_do_readdir_with_stat(pdu, fidp, max_count);
1700 if (count < 0) {
1701 err = count;
1702 goto out;
1703 }
1704 err = pdu_marshal(pdu, offset, "d", count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", count);
1705 if (err < 0) {
1706 goto out;
1707 }
1708 err += offset + count;
1709 } else if (fidp->fid_type == P9_FID_FILE) {
1710 QEMUIOVector qiov_full;
1711 QEMUIOVector qiov;
1712 int32_t len;
1713
1714 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset + 4, max_count, false0);
1715 qemu_iovec_init(&qiov, qiov_full.niov);
1716 do {
1717 qemu_iovec_reset(&qiov);
1718 qemu_iovec_copy(&qiov, &qiov_full, count, qiov_full.size - count);
1719 if (0) {
1720 print_sg(qiov.iov, qiov.niov);
1721 }
1722 /* Loop in case of EINTR */
1723 do {
1724 len = v9fs_co_preadv(pdu, fidp, qiov.iov, qiov.niov, off);
1725 if (len >= 0) {
1726 off += len;
1727 count += len;
1728 }
1729 } while (len == -EINTR4 && !pdu->cancelled);
1730 if (len < 0) {
1731 /* IO error return the error */
1732 err = len;
1733 goto out;
1734 }
1735 } while (count < max_count && len > 0);
1736 err = pdu_marshal(pdu, offset, "d", count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", count);
1737 if (err < 0) {
1738 goto out;
1739 }
1740 err += offset + count;
1741 qemu_iovec_destroy(&qiov);
1742 qemu_iovec_destroy(&qiov_full);
1743 } else if (fidp->fid_type == P9_FID_XATTR) {
1744 err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
1745 } else {
1746 err = -EINVAL22;
1747 }
1748 trace_v9fs_read_return(pdu->tag, pdu->id, count, err);
1749out:
1750 put_fid(pdu, fidp);
1751out_nofid:
1752 complete_pdu(s, pdu, err);
1753}
1754
1755static size_t v9fs_readdir_data_size(V9fsString *name)
1756{
1757 /*
1758 * Size of each dirent on the wire: size of qid (13) + size of offset (8)
1759 * size of type (1) + size of name.size (2) + strlen(name.data)
1760 */
1761 return 24 + v9fs_string_size(name);
1762}
1763
1764static int v9fs_do_readdir(V9fsPDU *pdu,
1765 V9fsFidState *fidp, int32_t max_count)
1766{
1767 size_t size;
1768 V9fsQID qid;
1769 V9fsString name;
1770 int len, err = 0;
1771 int32_t count = 0;
1772 off_t saved_dir_pos;
1773 struct dirent *dent, *result;
1774
1775 /* save the directory position */
1776 saved_dir_pos = v9fs_co_telldir(pdu, fidp);
1777 if (saved_dir_pos < 0) {
1778 return saved_dir_pos;
1779 }
1780
1781 dent = g_malloc(sizeof(struct dirent));
1782
1783 while (1) {
1784 err = v9fs_co_readdir_r(pdu, fidp, dent, &result);
1785 if (err || !result) {
1786 break;
1787 }
1788 v9fs_string_init(&name);
1789 v9fs_string_sprintf(&name, "%s", dent->d_name);
1790 if ((count + v9fs_readdir_data_size(&name)) > max_count) {
1791 /* Ran out of buffer. Set dir back to old position and return */
1792 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1793 v9fs_string_free(&name);
1794 g_free(dent);
1795 return count;
1796 }
1797 /*
1798 * Fill up just the path field of qid because the client uses
1799 * only that. To fill the entire qid structure we will have
1800 * to stat each dirent found, which is expensive
1801 */
1802 size = MIN(sizeof(dent->d_ino), sizeof(qid.path))(((sizeof(dent->d_ino)) < (sizeof(qid.path))) ? (sizeof
(dent->d_ino)) : (sizeof(qid.path)));
1803 memcpy(&qid.path, &dent->d_ino, size);
1804 /* Fill the other fields with dummy values */
1805 qid.type = 0;
1806 qid.version = 0;
1807
1808 /* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
1809 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)
1810 &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)
1811 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);
1812 if (len < 0) {
1813 v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
1814 v9fs_string_free(&name);
1815 g_free(dent);
1816 return len;
1817 }
1818 count += len;
1819 v9fs_string_free(&name);
1820 saved_dir_pos = dent->d_off;
1821 }
1822 g_free(dent);
1823 if (err < 0) {
1824 return err;
1825 }
1826 return count;
1827}
1828
1829static void v9fs_readdir(void *opaque)
1830{
1831 int32_t fid;
1832 V9fsFidState *fidp;
1833 ssize_t retval = 0;
1834 size_t offset = 7;
1835 uint64_t initial_offset;
1836 int32_t count;
1837 uint32_t max_count;
1838 V9fsPDU *pdu = opaque;
1839 V9fsState *s = pdu->s;
1840
1841 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)
1842 &initial_offset, &max_count)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dqd", &fid, &initial_offset, &max_count);
1843 if (retval < 0) {
1844 goto out_nofid;
1845 }
1846 trace_v9fs_readdir(pdu->tag, pdu->id, fid, initial_offset, max_count);
1847
1848 fidp = get_fid(pdu, fid);
1849 if (fidp == NULL((void*)0)) {
1850 retval = -EINVAL22;
1851 goto out_nofid;
1852 }
1853 if (!fidp->fs.dir) {
1854 retval = -EINVAL22;
1855 goto out;
1856 }
1857 if (initial_offset == 0) {
1858 v9fs_co_rewinddir(pdu, fidp);
1859 } else {
1860 v9fs_co_seekdir(pdu, fidp, initial_offset);
1861 }
1862 count = v9fs_do_readdir(pdu, fidp, max_count);
1863 if (count < 0) {
1864 retval = count;
1865 goto out;
1866 }
1867 retval = pdu_marshal(pdu, offset, "d", count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", count);
1868 if (retval < 0) {
1869 goto out;
1870 }
1871 retval += count + offset;
1872 trace_v9fs_readdir_return(pdu->tag, pdu->id, count, retval);
1873out:
1874 put_fid(pdu, fidp);
1875out_nofid:
1876 complete_pdu(s, pdu, retval);
1877}
1878
1879static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
1880 uint64_t off, uint32_t count,
1881 struct iovec *sg, int cnt)
1882{
1883 int i, to_copy;
1884 ssize_t err = 0;
1885 int write_count;
1886 int64_t xattr_len;
1887 size_t offset = 7;
1888
1889
1890 xattr_len = fidp->fs.xattr.len;
1891 write_count = xattr_len - off;
1892 if (write_count > count) {
1893 write_count = count;
1894 } else if (write_count < 0) {
1895 /*
1896 * write beyond XATTR value len specified in
1897 * xattrcreate
1898 */
1899 err = -ENOSPC28;
1900 goto out;
1901 }
1902 err = pdu_marshal(pdu, offset, "d", write_count)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", write_count);
1903 if (err < 0) {
1904 return err;
1905 }
1906 err += offset;
1907 fidp->fs.xattr.copied_len += write_count;
1908 /*
1909 * Now copy the content from sg list
1910 */
1911 for (i = 0; i < cnt; i++) {
1912 if (write_count > sg[i].iov_len) {
1913 to_copy = sg[i].iov_len;
1914 } else {
1915 to_copy = write_count;
1916 }
1917 memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
1918 /* updating vs->off since we are not using below */
1919 off += to_copy;
1920 write_count -= to_copy;
1921 }
1922out:
1923 return err;
1924}
1925
1926static void v9fs_write(void *opaque)
1927{
1928 ssize_t err;
1929 int32_t fid;
1930 uint64_t off;
1931 uint32_t count;
1932 int32_t len = 0;
1933 int32_t total = 0;
1934 size_t offset = 7;
1935 V9fsFidState *fidp;
1936 V9fsPDU *pdu = opaque;
1937 V9fsState *s = pdu->s;
1938 QEMUIOVector qiov_full;
1939 QEMUIOVector qiov;
1940
1941 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);
1942 if (err < 0) {
1943 return complete_pdu(s, pdu, err);
1944 }
1945 offset += err;
1946 v9fs_init_qiov_from_pdu(&qiov_full, pdu, offset, count, true1);
1947 trace_v9fs_write(pdu->tag, pdu->id, fid, off, count, qiov_full.niov);
1948
1949 fidp = get_fid(pdu, fid);
1950 if (fidp == NULL((void*)0)) {
1951 err = -EINVAL22;
1952 goto out_nofid;
1953 }
1954 if (fidp->fid_type == P9_FID_FILE) {
1955 if (fidp->fs.fd == -1) {
1956 err = -EINVAL22;
1957 goto out;
1958 }
1959 } else if (fidp->fid_type == P9_FID_XATTR) {
1960 /*
1961 * setxattr operation
1962 */
1963 err = v9fs_xattr_write(s, pdu, fidp, off, count,
1964 qiov_full.iov, qiov_full.niov);
1965 goto out;
1966 } else {
1967 err = -EINVAL22;
1968 goto out;
1969 }
1970 qemu_iovec_init(&qiov, qiov_full.niov);
1971 do {
1972 qemu_iovec_reset(&qiov);
1973 qemu_iovec_copy(&qiov, &qiov_full, total, qiov_full.size - total);
1974 if (0) {
1975 print_sg(qiov.iov, qiov.niov);
1976 }
1977 /* Loop in case of EINTR */
1978 do {
1979 len = v9fs_co_pwritev(pdu, fidp, qiov.iov, qiov.niov, off);
1980 if (len >= 0) {
1981 off += len;
1982 total += len;
1983 }
1984 } while (len == -EINTR4 && !pdu->cancelled);
1985 if (len < 0) {
1986 /* IO error return the error */
1987 err = len;
1988 goto out_qiov;
1989 }
1990 } while (total < count && len > 0);
1991
1992 offset = 7;
1993 err = pdu_marshal(pdu, offset, "d", total)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "d", total);
1994 if (err < 0) {
1995 goto out;
1996 }
1997 err += offset;
1998 trace_v9fs_write_return(pdu->tag, pdu->id, total, err);
1999out_qiov:
2000 qemu_iovec_destroy(&qiov);
2001out:
2002 put_fid(pdu, fidp);
2003out_nofid:
2004 qemu_iovec_destroy(&qiov_full);
2005 complete_pdu(s, pdu, err);
2006}
2007
2008static void v9fs_create(void *opaque)
2009{
2010 int32_t fid;
2011 int err = 0;
2012 size_t offset = 7;
2013 V9fsFidState *fidp;
2014 V9fsQID qid;
2015 int32_t perm;
2016 int8_t mode;
2017 V9fsPath path;
2018 struct stat stbuf;
2019 V9fsString name;
2020 V9fsString extension;
2021 int iounit;
2022 V9fsPDU *pdu = opaque;
2023
2024 v9fs_path_init(&path);
2025 v9fs_string_init(&name);
2026 v9fs_string_init(&extension);
2027 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)
2028 &perm, &mode, &extension)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdbs", &fid, &name, &perm, &mode, &
extension);
2029 if (err < 0) {
2030 goto out_nofid;
2031 }
2032 trace_v9fs_create(pdu->tag, pdu->id, fid, name.data, perm, mode);
2033
2034 fidp = get_fid(pdu, fid);
2035 if (fidp == NULL((void*)0)) {
2036 err = -EINVAL22;
2037 goto out_nofid;
2038 }
2039 if (perm & P9_STAT_MODE_DIR0x80000000) {
2040 err = v9fs_co_mkdir(pdu, fidp, &name, perm & 0777,
2041 fidp->uid, -1, &stbuf);
2042 if (err < 0) {
2043 goto out;
2044 }
2045 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2046 if (err < 0) {
2047 goto out;
2048 }
2049 v9fs_path_copy(&fidp->path, &path);
2050 err = v9fs_co_opendir(pdu, fidp);
2051 if (err < 0) {
2052 goto out;
2053 }
2054 fidp->fid_type = P9_FID_DIR;
2055 } else if (perm & P9_STAT_MODE_SYMLINK0x02000000) {
2056 err = v9fs_co_symlink(pdu, fidp, &name,
2057 extension.data, -1 , &stbuf);
2058 if (err < 0) {
2059 goto out;
2060 }
2061 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2062 if (err < 0) {
2063 goto out;
2064 }
2065 v9fs_path_copy(&fidp->path, &path);
2066 } else if (perm & P9_STAT_MODE_LINK0x01000000) {
2067 int32_t ofid = atoi(extension.data);
2068 V9fsFidState *ofidp = get_fid(pdu, ofid);
2069 if (ofidp == NULL((void*)0)) {
2070 err = -EINVAL22;
2071 goto out;
2072 }
2073 err = v9fs_co_link(pdu, ofidp, fidp, &name);
2074 put_fid(pdu, ofidp);
2075 if (err < 0) {
2076 goto out;
2077 }
2078 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2079 if (err < 0) {
2080 fidp->fid_type = P9_FID_NONE;
2081 goto out;
2082 }
2083 v9fs_path_copy(&fidp->path, &path);
2084 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2085 if (err < 0) {
2086 fidp->fid_type = P9_FID_NONE;
2087 goto out;
2088 }
2089 } else if (perm & P9_STAT_MODE_DEVICE0x00800000) {
2090 char ctype;
2091 uint32_t major, minor;
2092 mode_t nmode = 0;
2093
2094 if (sscanf(extension.data, "%c %u %u", &ctype, &major, &minor) != 3) {
2095 err = -errno(*__errno_location ());
2096 goto out;
2097 }
2098
2099 switch (ctype) {
2100 case 'c':
2101 nmode = S_IFCHR0020000;
2102 break;
2103 case 'b':
2104 nmode = S_IFBLK0060000;
2105 break;
2106 default:
2107 err = -EIO5;
2108 goto out;
2109 }
2110
2111 nmode |= perm & 0777;
2112 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2113 makedev(major, minor)gnu_dev_makedev (major, minor), nmode, &stbuf);
2114 if (err < 0) {
2115 goto out;
2116 }
2117 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2118 if (err < 0) {
2119 goto out;
2120 }
2121 v9fs_path_copy(&fidp->path, &path);
2122 } else if (perm & P9_STAT_MODE_NAMED_PIPE0x00200000) {
2123 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2124 0, S_IFIFO0010000 | (perm & 0777), &stbuf);
2125 if (err < 0) {
2126 goto out;
2127 }
2128 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2129 if (err < 0) {
2130 goto out;
2131 }
2132 v9fs_path_copy(&fidp->path, &path);
2133 } else if (perm & P9_STAT_MODE_SOCKET0x00100000) {
2134 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, -1,
2135 0, S_IFSOCK0140000 | (perm & 0777), &stbuf);
2136 if (err < 0) {
2137 goto out;
2138 }
2139 err = v9fs_co_name_to_path(pdu, &fidp->path, name.data, &path);
2140 if (err < 0) {
2141 goto out;
2142 }
2143 v9fs_path_copy(&fidp->path, &path);
2144 } else {
2145 err = v9fs_co_open2(pdu, fidp, &name, -1,
2146 omode_to_uflags(mode)|O_CREAT0100, perm, &stbuf);
2147 if (err < 0) {
2148 goto out;
2149 }
2150 fidp->fid_type = P9_FID_FILE;
2151 fidp->open_flags = omode_to_uflags(mode);
2152 if (fidp->open_flags & O_EXCL0200) {
2153 /*
2154 * We let the host file system do O_EXCL check
2155 * We should not reclaim such fd
2156 */
2157 fidp->flags |= FID_NON_RECLAIMABLE0x2;
2158 }
2159 }
2160 iounit = get_iounit(pdu, &fidp->path);
2161 stat_to_qid(&stbuf, &qid);
2162 err = pdu_marshal(pdu, offset, "Qd", &qid, iounit)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Qd", &qid, iounit);
2163 if (err < 0) {
2164 goto out;
2165 }
2166 err += offset;
2167 trace_v9fs_create_return(pdu->tag, pdu->id,
2168 qid.type, qid.version, qid.path, iounit);
2169out:
2170 put_fid(pdu, fidp);
2171out_nofid:
2172 complete_pdu(pdu->s, pdu, err);
2173 v9fs_string_free(&name);
2174 v9fs_string_free(&extension);
2175 v9fs_path_free(&path);
2176}
2177
2178static void v9fs_symlink(void *opaque)
2179{
2180 V9fsPDU *pdu = opaque;
2181 V9fsString name;
2182 V9fsString symname;
2183 V9fsFidState *dfidp;
2184 V9fsQID qid;
2185 struct stat stbuf;
2186 int32_t dfid;
2187 int err = 0;
2188 gid_t gid;
2189 size_t offset = 7;
2190
2191 v9fs_string_init(&name);
2192 v9fs_string_init(&symname);
2193 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);
2194 if (err < 0) {
2195 goto out_nofid;
2196 }
2197 trace_v9fs_symlink(pdu->tag, pdu->id, dfid, name.data, symname.data, gid);
2198
2199 dfidp = get_fid(pdu, dfid);
2200 if (dfidp == NULL((void*)0)) {
2201 err = -EINVAL22;
2202 goto out_nofid;
2203 }
2204 err = v9fs_co_symlink(pdu, dfidp, &name, symname.data, gid, &stbuf);
2205 if (err < 0) {
2206 goto out;
2207 }
2208 stat_to_qid(&stbuf, &qid);
2209 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
2210 if (err < 0) {
2211 goto out;
2212 }
2213 err += offset;
2214 trace_v9fs_symlink_return(pdu->tag, pdu->id,
2215 qid.type, qid.version, qid.path);
2216out:
2217 put_fid(pdu, dfidp);
2218out_nofid:
2219 complete_pdu(pdu->s, pdu, err);
2220 v9fs_string_free(&name);
2221 v9fs_string_free(&symname);
2222}
2223
2224static void v9fs_flush(void *opaque)
2225{
2226 ssize_t err;
2227 int16_t tag;
2228 size_t offset = 7;
2229 V9fsPDU *cancel_pdu;
2230 V9fsPDU *pdu = opaque;
2231 V9fsState *s = pdu->s;
2232
2233 err = pdu_unmarshal(pdu, offset, "w", &tag)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "w", &tag);
2234 if (err < 0) {
2235 complete_pdu(s, pdu, err);
2236 return;
2237 }
2238 trace_v9fs_flush(pdu->tag, pdu->id, tag);
2239
2240 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)) {
2241 if (cancel_pdu->tag == tag) {
2242 break;
2243 }
2244 }
2245 if (cancel_pdu) {
2246 cancel_pdu->cancelled = 1;
2247 /*
2248 * Wait for pdu to complete.
2249 */
2250 qemu_co_queue_wait(&cancel_pdu->complete);
2251 cancel_pdu->cancelled = 0;
2252 free_pdu(pdu->s, cancel_pdu);
2253 }
2254 complete_pdu(s, pdu, 7);
2255 return;
2256}
2257
2258static void v9fs_link(void *opaque)
2259{
2260 V9fsPDU *pdu = opaque;
2261 V9fsState *s = pdu->s;
2262 int32_t dfid, oldfid;
2263 V9fsFidState *dfidp, *oldfidp;
2264 V9fsString name;
2265 size_t offset = 7;
2266 int err = 0;
2267
2268 v9fs_string_init(&name);
2269 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);
2270 if (err < 0) {
2271 goto out_nofid;
2272 }
2273 trace_v9fs_link(pdu->tag, pdu->id, dfid, oldfid, name.data);
2274
2275 dfidp = get_fid(pdu, dfid);
2276 if (dfidp == NULL((void*)0)) {
2277 err = -ENOENT2;
2278 goto out_nofid;
2279 }
2280
2281 oldfidp = get_fid(pdu, oldfid);
2282 if (oldfidp == NULL((void*)0)) {
2283 err = -ENOENT2;
2284 goto out;
2285 }
2286 err = v9fs_co_link(pdu, oldfidp, dfidp, &name);
2287 if (!err) {
2288 err = offset;
2289 }
2290out:
2291 put_fid(pdu, dfidp);
2292out_nofid:
2293 v9fs_string_free(&name);
2294 complete_pdu(s, pdu, err);
2295}
2296
2297/* Only works with path name based fid */
2298static void v9fs_remove(void *opaque)
2299{
2300 int32_t fid;
2301 int err = 0;
2302 size_t offset = 7;
2303 V9fsFidState *fidp;
2304 V9fsPDU *pdu = opaque;
2305
2306 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
2307 if (err < 0) {
2308 goto out_nofid;
2309 }
2310 trace_v9fs_remove(pdu->tag, pdu->id, fid);
2311
2312 fidp = get_fid(pdu, fid);
2313 if (fidp == NULL((void*)0)) {
2314 err = -EINVAL22;
2315 goto out_nofid;
2316 }
2317 /* if fs driver is not path based, return EOPNOTSUPP */
2318 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT0x00000002)) {
2319 err = -EOPNOTSUPP95;
2320 goto out_err;
2321 }
2322 /*
2323 * IF the file is unlinked, we cannot reopen
2324 * the file later. So don't reclaim fd
2325 */
2326 err = v9fs_mark_fids_unreclaim(pdu, &fidp->path);
2327 if (err < 0) {
2328 goto out_err;
2329 }
2330 err = v9fs_co_remove(pdu, &fidp->path);
2331 if (!err) {
2332 err = offset;
2333 }
2334out_err:
2335 /* For TREMOVE we need to clunk the fid even on failed remove */
2336 clunk_fid(pdu->s, fidp->fid);
2337 put_fid(pdu, fidp);
2338out_nofid:
2339 complete_pdu(pdu->s, pdu, err);
2340}
2341
2342static void v9fs_unlinkat(void *opaque)
2343{
2344 int err = 0;
2345 V9fsString name;
2346 int32_t dfid, flags;
2347 size_t offset = 7;
2348 V9fsPath path;
2349 V9fsFidState *dfidp;
2350 V9fsPDU *pdu = opaque;
2351
2352 v9fs_string_init(&name);
2353 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);
2354 if (err < 0) {
2355 goto out_nofid;
2356 }
2357 dfidp = get_fid(pdu, dfid);
2358 if (dfidp == NULL((void*)0)) {
2359 err = -EINVAL22;
2360 goto out_nofid;
2361 }
2362 /*
2363 * IF the file is unlinked, we cannot reopen
2364 * the file later. So don't reclaim fd
2365 */
2366 v9fs_path_init(&path);
2367 err = v9fs_co_name_to_path(pdu, &dfidp->path, name.data, &path);
2368 if (err < 0) {
2369 goto out_err;
2370 }
2371 err = v9fs_mark_fids_unreclaim(pdu, &path);
2372 if (err < 0) {
2373 goto out_err;
2374 }
2375 err = v9fs_co_unlinkat(pdu, &dfidp->path, &name, flags);
2376 if (!err) {
2377 err = offset;
2378 }
2379out_err:
2380 put_fid(pdu, dfidp);
2381 v9fs_path_free(&path);
2382out_nofid:
2383 complete_pdu(pdu->s, pdu, err);
2384 v9fs_string_free(&name);
2385}
2386
2387
2388/* Only works with path name based fid */
2389static int v9fs_complete_rename(V9fsPDU *pdu, V9fsFidState *fidp,
2390 int32_t newdirfid, V9fsString *name)
2391{
2392 char *end;
2393 int err = 0;
2394 V9fsPath new_path;
2395 V9fsFidState *tfidp;
2396 V9fsState *s = pdu->s;
2397 V9fsFidState *dirfidp = NULL((void*)0);
2398 char *old_name, *new_name;
2399
2400 v9fs_path_init(&new_path);
2401 if (newdirfid != -1) {
2402 dirfidp = get_fid(pdu, newdirfid);
2403 if (dirfidp == NULL((void*)0)) {
2404 err = -ENOENT2;
2405 goto out_nofid;
2406 }
2407 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"
, 2407, __PRETTY_FUNCTION__));
2408 v9fs_co_name_to_path(pdu, &dirfidp->path, name->data, &new_path);
2409 } else {
2410 old_name = fidp->path.data;
2411 end = strrchr(old_name, '/');
2412 if (end) {
2413 end++;
2414 } else {
2415 end = old_name;
2416 }
2417 new_name = g_malloc0(end - old_name + name->size + 1);
2418 strncat(new_name, old_name, end - old_name);
2419 strncat(new_name + (end - old_name), name->data, name->size);
2420 v9fs_co_name_to_path(pdu, NULL((void*)0), new_name, &new_path);
2421 g_free(new_name);
2422 }
2423 err = v9fs_co_rename(pdu, &fidp->path, &new_path);
2424 if (err < 0) {
2425 goto out;
2426 }
2427 /*
2428 * Fixup fid's pointing to the old name to
2429 * start pointing to the new name
2430 */
2431 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2432 if (v9fs_path_is_ancestor(&fidp->path, &tfidp->path)) {
2433 /* replace the name */
2434 v9fs_fix_path(&tfidp->path, &new_path, strlen(fidp->path.data));
2435 }
2436 }
2437out:
2438 if (dirfidp) {
2439 put_fid(pdu, dirfidp);
2440 }
2441 v9fs_path_free(&new_path);
2442out_nofid:
2443 return err;
2444}
2445
2446/* Only works with path name based fid */
2447static void v9fs_rename(void *opaque)
2448{
2449 int32_t fid;
2450 ssize_t err = 0;
2451 size_t offset = 7;
2452 V9fsString name;
2453 int32_t newdirfid;
2454 V9fsFidState *fidp;
2455 V9fsPDU *pdu = opaque;
2456 V9fsState *s = pdu->s;
2457
2458 v9fs_string_init(&name);
2459 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);
2460 if (err < 0) {
2461 goto out_nofid;
2462 }
2463 fidp = get_fid(pdu, fid);
2464 if (fidp == NULL((void*)0)) {
2465 err = -ENOENT2;
2466 goto out_nofid;
2467 }
2468 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"
, 2468, __PRETTY_FUNCTION__));
2469 /* if fs driver is not path based, return EOPNOTSUPP */
2470 if (!(pdu->s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT0x00000002)) {
2471 err = -EOPNOTSUPP95;
2472 goto out;
2473 }
2474 v9fs_path_write_lock(s);
2475 err = v9fs_complete_rename(pdu, fidp, newdirfid, &name);
2476 v9fs_path_unlock(s);
2477 if (!err) {
2478 err = offset;
2479 }
2480out:
2481 put_fid(pdu, fidp);
2482out_nofid:
2483 complete_pdu(s, pdu, err);
2484 v9fs_string_free(&name);
2485}
2486
2487static void v9fs_fix_fid_paths(V9fsPDU *pdu, V9fsPath *olddir,
2488 V9fsString *old_name, V9fsPath *newdir,
2489 V9fsString *new_name)
2490{
2491 V9fsFidState *tfidp;
2492 V9fsPath oldpath, newpath;
2493 V9fsState *s = pdu->s;
2494
2495
2496 v9fs_path_init(&oldpath);
2497 v9fs_path_init(&newpath);
2498 v9fs_co_name_to_path(pdu, olddir, old_name->data, &oldpath);
2499 v9fs_co_name_to_path(pdu, newdir, new_name->data, &newpath);
2500
2501 /*
2502 * Fixup fid's pointing to the old name to
2503 * start pointing to the new name
2504 */
2505 for (tfidp = s->fid_list; tfidp; tfidp = tfidp->next) {
2506 if (v9fs_path_is_ancestor(&oldpath, &tfidp->path)) {
2507 /* replace the name */
2508 v9fs_fix_path(&tfidp->path, &newpath, strlen(oldpath.data));
2509 }
2510 }
2511 v9fs_path_free(&oldpath);
2512 v9fs_path_free(&newpath);
2513}
2514
2515static int v9fs_complete_renameat(V9fsPDU *pdu, int32_t olddirfid,
2516 V9fsString *old_name, int32_t newdirfid,
2517 V9fsString *new_name)
2518{
2519 int err = 0;
2520 V9fsState *s = pdu->s;
2521 V9fsFidState *newdirfidp = NULL((void*)0), *olddirfidp = NULL((void*)0);
2522
2523 olddirfidp = get_fid(pdu, olddirfid);
2524 if (olddirfidp == NULL((void*)0)) {
2525 err = -ENOENT2;
2526 goto out;
2527 }
2528 if (newdirfid != -1) {
2529 newdirfidp = get_fid(pdu, newdirfid);
2530 if (newdirfidp == NULL((void*)0)) {
2531 err = -ENOENT2;
2532 goto out;
2533 }
2534 } else {
2535 newdirfidp = get_fid(pdu, olddirfid);
2536 }
2537
2538 err = v9fs_co_renameat(pdu, &olddirfidp->path, old_name,
2539 &newdirfidp->path, new_name);
2540 if (err < 0) {
2541 goto out;
2542 }
2543 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT0x00000002) {
2544 /* Only for path based fid we need to do the below fixup */
2545 v9fs_fix_fid_paths(pdu, &olddirfidp->path, old_name,
2546 &newdirfidp->path, new_name);
2547 }
2548out:
2549 if (olddirfidp) {
2550 put_fid(pdu, olddirfidp);
2551 }
2552 if (newdirfidp) {
2553 put_fid(pdu, newdirfidp);
2554 }
2555 return err;
2556}
2557
2558static void v9fs_renameat(void *opaque)
2559{
2560 ssize_t err = 0;
2561 size_t offset = 7;
2562 V9fsPDU *pdu = opaque;
2563 V9fsState *s = pdu->s;
2564 int32_t olddirfid, newdirfid;
2565 V9fsString old_name, new_name;
2566
2567 v9fs_string_init(&old_name);
2568 v9fs_string_init(&new_name);
2569 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)
2570 &old_name, &newdirfid, &new_name)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsds", &olddirfid, &old_name, &newdirfid, &
new_name);
2571 if (err < 0) {
2572 goto out_err;
2573 }
2574
2575 v9fs_path_write_lock(s);
2576 err = v9fs_complete_renameat(pdu, olddirfid,
2577 &old_name, newdirfid, &new_name);
2578 v9fs_path_unlock(s);
2579 if (!err) {
2580 err = offset;
2581 }
2582
2583out_err:
2584 complete_pdu(s, pdu, err);
2585 v9fs_string_free(&old_name);
2586 v9fs_string_free(&new_name);
2587}
2588
2589static void v9fs_wstat(void *opaque)
2590{
2591 int32_t fid;
2592 int err = 0;
2593 int16_t unused;
2594 V9fsStat v9stat;
2595 size_t offset = 7;
2596 struct stat stbuf;
2597 V9fsFidState *fidp;
2598 V9fsPDU *pdu = opaque;
2599 V9fsState *s = pdu->s;
2600
2601 v9fs_stat_init(&v9stat);
2602 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);
2603 if (err < 0) {
2604 goto out_nofid;
2605 }
2606 trace_v9fs_wstat(pdu->tag, pdu->id, fid,
2607 v9stat.mode, v9stat.atime, v9stat.mtime);
2608
2609 fidp = get_fid(pdu, fid);
2610 if (fidp == NULL((void*)0)) {
2611 err = -EINVAL22;
2612 goto out_nofid;
2613 }
2614 /* do we need to sync the file? */
2615 if (donttouch_stat(&v9stat)) {
2616 err = v9fs_co_fsync(pdu, fidp, 0);
2617 goto out;
2618 }
2619 if (v9stat.mode != -1) {
2620 uint32_t v9_mode;
2621 err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
2622 if (err < 0) {
2623 goto out;
2624 }
2625 v9_mode = stat_to_v9mode(&stbuf);
2626 if ((v9stat.mode & P9_STAT_MODE_TYPE_BITS(0x80000000 | 0x02000000 | 0x01000000 | 0x00800000 | 0x00200000
| 0x00100000)) !=
2627 (v9_mode & P9_STAT_MODE_TYPE_BITS(0x80000000 | 0x02000000 | 0x01000000 | 0x00800000 | 0x00200000
| 0x00100000))) {
2628 /* Attempting to change the type */
2629 err = -EIO5;
2630 goto out;
2631 }
2632 err = v9fs_co_chmod(pdu, &fidp->path,
2633 v9mode_to_mode(v9stat.mode,
2634 &v9stat.extension));
2635 if (err < 0) {
2636 goto out;
2637 }
2638 }
2639 if (v9stat.mtime != -1 || v9stat.atime != -1) {
2640 struct timespec times[2];
2641 if (v9stat.atime != -1) {
2642 times[0].tv_sec = v9stat.atime;
2643 times[0].tv_nsec = 0;
2644 } else {
2645 times[0].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
2646 }
2647 if (v9stat.mtime != -1) {
2648 times[1].tv_sec = v9stat.mtime;
2649 times[1].tv_nsec = 0;
2650 } else {
2651 times[1].tv_nsec = UTIME_OMIT((1l << 30) - 2l);
2652 }
2653 err = v9fs_co_utimensat(pdu, &fidp->path, times);
2654 if (err < 0) {
2655 goto out;
2656 }
2657 }
2658 if (v9stat.n_gid != -1 || v9stat.n_uid != -1) {
2659 err = v9fs_co_chown(pdu, &fidp->path, v9stat.n_uid, v9stat.n_gid);
2660 if (err < 0) {
2661 goto out;
2662 }
2663 }
2664 if (v9stat.name.size != 0) {
2665 err = v9fs_complete_rename(pdu, fidp, -1, &v9stat.name);
2666 if (err < 0) {
2667 goto out;
2668 }
2669 }
2670 if (v9stat.length != -1) {
2671 err = v9fs_co_truncate(pdu, &fidp->path, v9stat.length);
2672 if (err < 0) {
2673 goto out;
2674 }
2675 }
2676 err = offset;
2677out:
2678 put_fid(pdu, fidp);
2679out_nofid:
2680 v9fs_stat_free(&v9stat);
2681 complete_pdu(s, pdu, err);
2682}
2683
2684static int v9fs_fill_statfs(V9fsState *s, V9fsPDU *pdu, struct statfs *stbuf)
2685{
2686 uint32_t f_type;
2687 uint32_t f_bsize;
2688 uint64_t f_blocks;
2689 uint64_t f_bfree;
2690 uint64_t f_bavail;
2691 uint64_t f_files;
2692 uint64_t f_ffree;
2693 uint64_t fsid_val;
2694 uint32_t f_namelen;
2695 size_t offset = 7;
2696 int32_t bsize_factor;
2697
2698 /*
2699 * compute bsize factor based on host file system block size
2700 * and client msize
2701 */
2702 bsize_factor = (s->msize - P9_IOHDRSZ24)/stbuf->f_bsize;
2703 if (!bsize_factor) {
2704 bsize_factor = 1;
2705 }
2706 f_type = stbuf->f_type;
2707 f_bsize = stbuf->f_bsize;
2708 f_bsize *= bsize_factor;
2709 /*
2710 * f_bsize is adjusted(multiplied) by bsize factor, so we need to
2711 * adjust(divide) the number of blocks, free blocks and available
2712 * blocks by bsize factor
2713 */
2714 f_blocks = stbuf->f_blocks/bsize_factor;
2715 f_bfree = stbuf->f_bfree/bsize_factor;
2716 f_bavail = stbuf->f_bavail/bsize_factor;
2717 f_files = stbuf->f_files;
2718 f_ffree = stbuf->f_ffree;
2719 fsid_val = (unsigned int) stbuf->f_fsid.__val[0] |
2720 (unsigned long long)stbuf->f_fsid.__val[1] << 32;
2721 f_namelen = stbuf->f_namelen;
2722
2723 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)
2724 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)
2725 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)
2726 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);
2727}
2728
2729static void v9fs_statfs(void *opaque)
2730{
2731 int32_t fid;
2732 ssize_t retval = 0;
2733 size_t offset = 7;
2734 V9fsFidState *fidp;
2735 struct statfs stbuf;
2736 V9fsPDU *pdu = opaque;
2737 V9fsState *s = pdu->s;
2738
2739 retval = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
2740 if (retval < 0) {
2741 goto out_nofid;
2742 }
2743 fidp = get_fid(pdu, fid);
2744 if (fidp == NULL((void*)0)) {
2745 retval = -ENOENT2;
2746 goto out_nofid;
2747 }
2748 retval = v9fs_co_statfs(pdu, &fidp->path, &stbuf);
2749 if (retval < 0) {
2750 goto out;
2751 }
2752 retval = v9fs_fill_statfs(s, pdu, &stbuf);
2753 if (retval < 0) {
2754 goto out;
2755 }
2756 retval += offset;
2757out:
2758 put_fid(pdu, fidp);
2759out_nofid:
2760 complete_pdu(s, pdu, retval);
2761 return;
2762}
2763
2764static void v9fs_mknod(void *opaque)
2765{
2766
2767 int mode;
2768 gid_t gid;
2769 int32_t fid;
2770 V9fsQID qid;
2771 int err = 0;
2772 int major, minor;
2773 size_t offset = 7;
2774 V9fsString name;
2775 struct stat stbuf;
2776 V9fsFidState *fidp;
2777 V9fsPDU *pdu = opaque;
2778 V9fsState *s = pdu->s;
2779
2780 v9fs_string_init(&name);
2781 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)
2782 &major, &minor, &gid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "dsdddd", &fid, &name, &mode, &major, &
minor, &gid);
2783 if (err < 0) {
2784 goto out_nofid;
2785 }
2786 trace_v9fs_mknod(pdu->tag, pdu->id, fid, mode, major, minor);
2787
2788 fidp = get_fid(pdu, fid);
2789 if (fidp == NULL((void*)0)) {
2790 err = -ENOENT2;
2791 goto out_nofid;
2792 }
2793 err = v9fs_co_mknod(pdu, fidp, &name, fidp->uid, gid,
2794 makedev(major, minor)gnu_dev_makedev (major, minor), mode, &stbuf);
2795 if (err < 0) {
2796 goto out;
2797 }
2798 stat_to_qid(&stbuf, &qid);
2799 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
2800 if (err < 0) {
2801 goto out;
2802 }
2803 err += offset;
2804 trace_v9fs_mknod_return(pdu->tag, pdu->id,
2805 qid.type, qid.version, qid.path);
2806out:
2807 put_fid(pdu, fidp);
2808out_nofid:
2809 complete_pdu(s, pdu, err);
2810 v9fs_string_free(&name);
2811}
2812
2813/*
2814 * Implement posix byte range locking code
2815 * Server side handling of locking code is very simple, because 9p server in
2816 * QEMU can handle only one client. And most of the lock handling
2817 * (like conflict, merging) etc is done by the VFS layer itself, so no need to
2818 * do any thing in * qemu 9p server side lock code path.
2819 * So when a TLOCK request comes, always return success
2820 */
2821static void v9fs_lock(void *opaque)
2822{
2823 int8_t status;
2824 V9fsFlock flock;
2825 size_t offset = 7;
2826 struct stat stbuf;
2827 V9fsFidState *fidp;
2828 int32_t fid, err = 0;
2829 V9fsPDU *pdu = opaque;
2830 V9fsState *s = pdu->s;
2831
2832 status = P9_LOCK_ERROR2;
2833 v9fs_string_init(&flock.client_id);
2834 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)
2835 &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)
2836 &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);
2837 if (err < 0) {
2838 goto out_nofid;
2839 }
2840 trace_v9fs_lock(pdu->tag, pdu->id, fid,
2841 flock.type, flock.start, flock.length);
2842
2843
2844 /* We support only block flag now (that too ignored currently) */
2845 if (flock.flags & ~P9_LOCK_FLAGS_BLOCK1) {
2846 err = -EINVAL22;
2847 goto out_nofid;
2848 }
2849 fidp = get_fid(pdu, fid);
2850 if (fidp == NULL((void*)0)) {
2851 err = -ENOENT2;
2852 goto out_nofid;
2853 }
2854 err = v9fs_co_fstat(pdu, fidp, &stbuf);
2855 if (err < 0) {
2856 goto out;
2857 }
2858 status = P9_LOCK_SUCCESS0;
2859out:
2860 put_fid(pdu, fidp);
2861out_nofid:
2862 err = pdu_marshal(pdu, offset, "b", status)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "b", status);
2863 if (err > 0) {
2864 err += offset;
2865 }
2866 trace_v9fs_lock_return(pdu->tag, pdu->id, status);
2867 complete_pdu(s, pdu, err);
2868 v9fs_string_free(&flock.client_id);
2869}
2870
2871/*
2872 * When a TGETLOCK request comes, always return success because all lock
2873 * handling is done by client's VFS layer.
2874 */
2875static void v9fs_getlock(void *opaque)
2876{
2877 size_t offset = 7;
2878 struct stat stbuf;
2879 V9fsFidState *fidp;
2880 V9fsGetlock glock;
2881 int32_t fid, err = 0;
2882 V9fsPDU *pdu = opaque;
2883 V9fsState *s = pdu->s;
2884
2885 v9fs_string_init(&glock.client_id);
2886 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)
2887 &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)
2888 &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);
2889 if (err < 0) {
2890 goto out_nofid;
2891 }
2892 trace_v9fs_getlock(pdu->tag, pdu->id, fid,
2893 glock.type, glock.start, glock.length);
2894
2895 fidp = get_fid(pdu, fid);
2896 if (fidp == NULL((void*)0)) {
2897 err = -ENOENT2;
2898 goto out_nofid;
2899 }
2900 err = v9fs_co_fstat(pdu, fidp, &stbuf);
2901 if (err < 0) {
2902 goto out;
2903 }
2904 glock.type = P9_LOCK_TYPE_UNLCK2;
2905 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)
2906 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)
2907 &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);
2908 if (err < 0) {
2909 goto out;
2910 }
2911 err += offset;
2912 trace_v9fs_getlock_return(pdu->tag, pdu->id, glock.type, glock.start,
2913 glock.length, glock.proc_id);
2914out:
2915 put_fid(pdu, fidp);
2916out_nofid:
2917 complete_pdu(s, pdu, err);
2918 v9fs_string_free(&glock.client_id);
2919}
2920
2921static void v9fs_mkdir(void *opaque)
2922{
2923 V9fsPDU *pdu = opaque;
2924 size_t offset = 7;
2925 int32_t fid;
2926 struct stat stbuf;
2927 V9fsQID qid;
2928 V9fsString name;
2929 V9fsFidState *fidp;
2930 gid_t gid;
2931 int mode;
2932 int err = 0;
2933
2934 v9fs_string_init(&name);
2935 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);
2936 if (err < 0) {
2937 goto out_nofid;
2938 }
2939 trace_v9fs_mkdir(pdu->tag, pdu->id, fid, name.data, mode, gid);
2940
2941 fidp = get_fid(pdu, fid);
2942 if (fidp == NULL((void*)0)) {
2943 err = -ENOENT2;
2944 goto out_nofid;
2945 }
2946 err = v9fs_co_mkdir(pdu, fidp, &name, mode, fidp->uid, gid, &stbuf);
2947 if (err < 0) {
2948 goto out;
2949 }
2950 stat_to_qid(&stbuf, &qid);
2951 err = pdu_marshal(pdu, offset, "Q", &qid)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "Q", &qid);
2952 if (err < 0) {
2953 goto out;
2954 }
2955 err += offset;
2956 trace_v9fs_mkdir_return(pdu->tag, pdu->id,
2957 qid.type, qid.version, qid.path, err);
2958out:
2959 put_fid(pdu, fidp);
2960out_nofid:
2961 complete_pdu(pdu->s, pdu, err);
2962 v9fs_string_free(&name);
2963}
2964
2965static void v9fs_xattrwalk(void *opaque)
2966{
2967 int64_t size;
2968 V9fsString name;
2969 ssize_t err = 0;
2970 size_t offset = 7;
2971 int32_t fid, newfid;
2972 V9fsFidState *file_fidp;
2973 V9fsFidState *xattr_fidp = NULL((void*)0);
2974 V9fsPDU *pdu = opaque;
2975 V9fsState *s = pdu->s;
2976
2977 v9fs_string_init(&name);
2978 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);
2979 if (err < 0) {
2980 goto out_nofid;
2981 }
2982 trace_v9fs_xattrwalk(pdu->tag, pdu->id, fid, newfid, name.data);
2983
2984 file_fidp = get_fid(pdu, fid);
2985 if (file_fidp == NULL((void*)0)) {
2986 err = -ENOENT2;
2987 goto out_nofid;
2988 }
2989 xattr_fidp = alloc_fid(s, newfid);
2990 if (xattr_fidp == NULL((void*)0)) {
2991 err = -EINVAL22;
2992 goto out;
2993 }
2994 v9fs_path_copy(&xattr_fidp->path, &file_fidp->path);
2995 if (name.data == NULL((void*)0)) {
2996 /*
2997 * listxattr request. Get the size first
2998 */
2999 size = v9fs_co_llistxattr(pdu, &xattr_fidp->path, NULL((void*)0), 0);
3000 if (size < 0) {
3001 err = size;
3002 clunk_fid(s, xattr_fidp->fid);
3003 goto out;
3004 }
3005 /*
3006 * Read the xattr value
3007 */
3008 xattr_fidp->fs.xattr.len = size;
3009 xattr_fidp->fid_type = P9_FID_XATTR;
3010 xattr_fidp->fs.xattr.copied_len = -1;
3011 if (size) {
3012 xattr_fidp->fs.xattr.value = g_malloc(size);
3013 err = v9fs_co_llistxattr(pdu, &xattr_fidp->path,
3014 xattr_fidp->fs.xattr.value,
3015 xattr_fidp->fs.xattr.len);
3016 if (err < 0) {
3017 clunk_fid(s, xattr_fidp->fid);
3018 goto out;
3019 }
3020 }
3021 err = pdu_marshal(pdu, offset, "q", size)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "q", size);
3022 if (err < 0) {
3023 goto out;
3024 }
3025 err += offset;
3026 } else {
3027 /*
3028 * specific xattr fid. We check for xattr
3029 * presence also collect the xattr size
3030 */
3031 size = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3032 &name, NULL((void*)0), 0);
3033 if (size < 0) {
3034 err = size;
3035 clunk_fid(s, xattr_fidp->fid);
3036 goto out;
3037 }
3038 /*
3039 * Read the xattr value
3040 */
3041 xattr_fidp->fs.xattr.len = size;
3042 xattr_fidp->fid_type = P9_FID_XATTR;
3043 xattr_fidp->fs.xattr.copied_len = -1;
3044 if (size) {
3045 xattr_fidp->fs.xattr.value = g_malloc(size);
3046 err = v9fs_co_lgetxattr(pdu, &xattr_fidp->path,
3047 &name, xattr_fidp->fs.xattr.value,
3048 xattr_fidp->fs.xattr.len);
3049 if (err < 0) {
3050 clunk_fid(s, xattr_fidp->fid);
3051 goto out;
3052 }
3053 }
3054 err = pdu_marshal(pdu, offset, "q", size)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "q", size);
3055 if (err < 0) {
3056 goto out;
3057 }
3058 err += offset;
3059 }
3060 trace_v9fs_xattrwalk_return(pdu->tag, pdu->id, size);
3061out:
3062 put_fid(pdu, file_fidp);
3063 if (xattr_fidp) {
3064 put_fid(pdu, xattr_fidp);
3065 }
3066out_nofid:
3067 complete_pdu(s, pdu, err);
3068 v9fs_string_free(&name);
3069}
3070
3071static void v9fs_xattrcreate(void *opaque)
3072{
3073 int flags;
3074 int32_t fid;
3075 int64_t size;
3076 ssize_t err = 0;
3077 V9fsString name;
3078 size_t offset = 7;
3079 V9fsFidState *file_fidp;
3080 V9fsFidState *xattr_fidp;
3081 V9fsPDU *pdu = opaque;
3082 V9fsState *s = pdu->s;
3083
3084 v9fs_string_init(&name);
3085 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);
3086 if (err < 0) {
3087 goto out_nofid;
3088 }
3089 trace_v9fs_xattrcreate(pdu->tag, pdu->id, fid, name.data, size, flags);
3090
3091 file_fidp = get_fid(pdu, fid);
3092 if (file_fidp == NULL((void*)0)) {
3093 err = -EINVAL22;
3094 goto out_nofid;
3095 }
3096 /* Make the file fid point to xattr */
3097 xattr_fidp = file_fidp;
3098 xattr_fidp->fid_type = P9_FID_XATTR;
3099 xattr_fidp->fs.xattr.copied_len = 0;
3100 xattr_fidp->fs.xattr.len = size;
3101 xattr_fidp->fs.xattr.flags = flags;
3102 v9fs_string_init(&xattr_fidp->fs.xattr.name);
3103 v9fs_string_copy(&xattr_fidp->fs.xattr.name, &name);
3104 if (size) {
3105 xattr_fidp->fs.xattr.value = g_malloc(size);
3106 } else {
3107 xattr_fidp->fs.xattr.value = NULL((void*)0);
3108 }
3109 err = offset;
3110 put_fid(pdu, file_fidp);
3111out_nofid:
3112 complete_pdu(s, pdu, err);
3113 v9fs_string_free(&name);
3114}
3115
3116static void v9fs_readlink(void *opaque)
3117{
3118 V9fsPDU *pdu = opaque;
3119 size_t offset = 7;
3120 V9fsString target;
3121 int32_t fid;
3122 int err = 0;
3123 V9fsFidState *fidp;
3124
3125 err = pdu_unmarshal(pdu, offset, "d", &fid)v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset
, 1, "d", &fid);
3126 if (err < 0) {
3127 goto out_nofid;
3128 }
3129 trace_v9fs_readlink(pdu->tag, pdu->id, fid);
3130 fidp = get_fid(pdu, fid);
3131 if (fidp == NULL((void*)0)) {
3132 err = -ENOENT2;
3133 goto out_nofid;
3134 }
3135
3136 v9fs_string_init(&target);
3137 err = v9fs_co_readlink(pdu, &fidp->path, &target);
3138 if (err < 0) {
3139 goto out;
3140 }
3141 err = pdu_marshal(pdu, offset, "s", &target)v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset,
1, "s", &target);
3142 if (err < 0) {
3143 v9fs_string_free(&target);
3144 goto out;
3145 }
3146 err += offset;
3147 trace_v9fs_readlink_return(pdu->tag, pdu->id, target.data);
3148 v9fs_string_free(&target);
3149out:
3150 put_fid(pdu, fidp);
3151out_nofid:
3152 complete_pdu(pdu->s, pdu, err);
3153}
3154
3155static CoroutineEntry *pdu_co_handlers[] = {
3156 [P9_TREADDIR] = v9fs_readdir,
3157 [P9_TSTATFS] = v9fs_statfs,
3158 [P9_TGETATTR] = v9fs_getattr,
3159 [P9_TSETATTR] = v9fs_setattr,
3160 [P9_TXATTRWALK] = v9fs_xattrwalk,
3161 [P9_TXATTRCREATE] = v9fs_xattrcreate,
3162 [P9_TMKNOD] = v9fs_mknod,
3163 [P9_TRENAME] = v9fs_rename,
3164 [P9_TLOCK] = v9fs_lock,
3165 [P9_TGETLOCK] = v9fs_getlock,
3166 [P9_TRENAMEAT] = v9fs_renameat,
3167 [P9_TREADLINK] = v9fs_readlink,
3168 [P9_TUNLINKAT] = v9fs_unlinkat,
3169 [P9_TMKDIR] = v9fs_mkdir,
3170 [P9_TVERSION] = v9fs_version,
3171 [P9_TLOPEN] = v9fs_open,
3172 [P9_TATTACH] = v9fs_attach,
3173 [P9_TSTAT] = v9fs_stat,
3174 [P9_TWALK] = v9fs_walk,
3175 [P9_TCLUNK] = v9fs_clunk,
3176 [P9_TFSYNC] = v9fs_fsync,
3177 [P9_TOPEN] = v9fs_open,
3178 [P9_TREAD] = v9fs_read,
3179#if 0
3180 [P9_TAUTH] = v9fs_auth,
3181#endif
3182 [P9_TFLUSH] = v9fs_flush,
3183 [P9_TLINK] = v9fs_link,
3184 [P9_TSYMLINK] = v9fs_symlink,
3185 [P9_TCREATE] = v9fs_create,
3186 [P9_TLCREATE] = v9fs_lcreate,
3187 [P9_TWRITE] = v9fs_write,
3188 [P9_TWSTAT] = v9fs_wstat,
3189 [P9_TREMOVE] = v9fs_remove,
3190};
3191
3192static void v9fs_op_not_supp(void *opaque)
3193{
3194 V9fsPDU *pdu = opaque;
3195 complete_pdu(pdu->s, pdu, -EOPNOTSUPP95);
3196}
3197
3198static void v9fs_fs_ro(void *opaque)
3199{
3200 V9fsPDU *pdu = opaque;
3201 complete_pdu(pdu->s, pdu, -EROFS30);
3202}
3203
3204static inline bool_Bool is_read_only_op(V9fsPDU *pdu)
3205{
3206 switch (pdu->id) {
3207 case P9_TREADDIR:
3208 case P9_TSTATFS:
3209 case P9_TGETATTR:
3210 case P9_TXATTRWALK:
3211 case P9_TLOCK:
3212 case P9_TGETLOCK:
3213 case P9_TREADLINK:
3214 case P9_TVERSION:
3215 case P9_TLOPEN:
3216 case P9_TATTACH:
3217 case P9_TSTAT:
3218 case P9_TWALK:
3219 case P9_TCLUNK:
3220 case P9_TFSYNC:
3221 case P9_TOPEN:
3222 case P9_TREAD:
3223 case P9_TAUTH:
3224 case P9_TFLUSH:
3225 return 1;
3226 default:
3227 return 0;
3228 }
3229}
3230
3231static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3232{
3233 Coroutine *co;
3234 CoroutineEntry *handler;
3235
3236 if (pdu->id >= ARRAY_SIZE(pdu_co_handlers)(sizeof(pdu_co_handlers) / sizeof((pdu_co_handlers)[0])) ||
3237 (pdu_co_handlers[pdu->id] == NULL((void*)0))) {
3238 handler = v9fs_op_not_supp;
3239 } else {
3240 handler = pdu_co_handlers[pdu->id];
3241 }
3242
3243 if (is_ro_export(&s->ctx) && !is_read_only_op(pdu)) {
3244 handler = v9fs_fs_ro;
3245 }
3246 co = qemu_coroutine_create(handler);
3247 qemu_coroutine_enter(co, pdu);
3248}
3249
3250void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3251{
3252 V9fsState *s = (V9fsState *)vdev;
3253 V9fsPDU *pdu;
3254 ssize_t len;
3255
3256 while ((pdu = alloc_pdu(s)) &&
3257 (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
Although the value stored to 'len' is used in the enclosing expression, the value is never actually read from 'len'
3258 uint8_t *ptr;
3259 pdu->s = s;
3260 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", 3260
, __PRETTY_FUNCTION__));
3261 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"
, 3261, __PRETTY_FUNCTION__));
3262
3263 ptr = pdu->elem.out_sg[0].iov_base;
3264
3265 pdu->size = le32_to_cpu(*(uint32_t *)ptr);
3266 pdu->id = ptr[4];
3267 pdu->tag = le16_to_cpu(*(uint16_t *)(ptr + 5));
3268 qemu_co_queue_init(&pdu->complete);
3269 submit_pdu(s, pdu);
3270 }
3271 free_pdu(s, pdu);
3272}
3273
3274void virtio_9p_set_fd_limit(void)
3275{
3276 struct rlimit rlim;
3277 if (getrlimit(RLIMIT_NOFILERLIMIT_NOFILE, &rlim) < 0) {
3278 fprintf(stderrstderr, "Failed to get the resource limit\n");
3279 exit(1);
3280 }
3281 open_fd_hw = rlim.rlim_cur - MIN(400, rlim.rlim_cur/3)(((400) < (rlim.rlim_cur/3)) ? (400) : (rlim.rlim_cur/3));
3282 open_fd_rc = rlim.rlim_cur/2;
3283}