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1.1 root 1: /*
2: * Virtio 9p backend
3: *
4: * Copyright IBM, Corp. 2010
5: *
6: * Authors:
7: * Anthony Liguori <[email protected]>
8: *
9: * This work is licensed under the terms of the GNU GPL, version 2. See
10: * the COPYING file in the top-level directory.
11: *
12: */
13:
14: #include "virtio.h"
15: #include "pc.h"
16: #include "qemu_socket.h"
17: #include "virtio-9p.h"
18: #include "fsdev/qemu-fsdev.h"
19: #include "virtio-9p-debug.h"
20:
21: int dotu = 1;
22: int debug_9p_pdu;
23:
24: enum {
25: Oread = 0x00,
26: Owrite = 0x01,
27: Ordwr = 0x02,
28: Oexec = 0x03,
29: Oexcl = 0x04,
30: Otrunc = 0x10,
31: Orexec = 0x20,
32: Orclose = 0x40,
33: Oappend = 0x80,
34: };
35:
36: static int omode_to_uflags(int8_t mode)
37: {
38: int ret = 0;
39:
40: switch (mode & 3) {
41: case Oread:
42: ret = O_RDONLY;
43: break;
44: case Ordwr:
45: ret = O_RDWR;
46: break;
47: case Owrite:
48: ret = O_WRONLY;
49: break;
50: case Oexec:
51: ret = O_RDONLY;
52: break;
53: }
54:
55: if (mode & Otrunc) {
56: ret |= O_TRUNC;
57: }
58:
59: if (mode & Oappend) {
60: ret |= O_APPEND;
61: }
62:
63: if (mode & Oexcl) {
64: ret |= O_EXCL;
65: }
66:
67: return ret;
68: }
69:
70: void cred_init(FsCred *credp)
71: {
72: credp->fc_uid = -1;
73: credp->fc_gid = -1;
74: credp->fc_mode = -1;
75: credp->fc_rdev = -1;
76: }
77:
78: static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
79: {
80: return s->ops->lstat(&s->ctx, path->data, stbuf);
81: }
82:
83: static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf)
84: {
85: ssize_t len;
86:
87: buf->data = qemu_malloc(1024);
88:
89: len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1);
90: if (len > -1) {
91: buf->size = len;
92: buf->data[len] = 0;
93: }
94:
95: return len;
96: }
97:
98: static int v9fs_do_close(V9fsState *s, int fd)
99: {
100: return s->ops->close(&s->ctx, fd);
101: }
102:
103: static int v9fs_do_closedir(V9fsState *s, DIR *dir)
104: {
105: return s->ops->closedir(&s->ctx, dir);
106: }
107:
108: static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags)
109: {
110: return s->ops->open(&s->ctx, path->data, flags);
111: }
112:
113: static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
114: {
115: return s->ops->opendir(&s->ctx, path->data);
116: }
117:
118: static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
119: {
120: return s->ops->rewinddir(&s->ctx, dir);
121: }
122:
123: static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
124: {
125: return s->ops->telldir(&s->ctx, dir);
126: }
127:
128: static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir)
129: {
130: return s->ops->readdir(&s->ctx, dir);
131: }
132:
133: static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
134: {
135: return s->ops->seekdir(&s->ctx, dir, off);
136: }
137:
138: static int v9fs_do_readv(V9fsState *s, int fd, const struct iovec *iov,
139: int iovcnt)
140: {
141: return s->ops->readv(&s->ctx, fd, iov, iovcnt);
142: }
143:
144: static off_t v9fs_do_lseek(V9fsState *s, int fd, off_t offset, int whence)
145: {
146: return s->ops->lseek(&s->ctx, fd, offset, whence);
147: }
148:
149: static int v9fs_do_writev(V9fsState *s, int fd, const struct iovec *iov,
150: int iovcnt)
151: {
152: return s->ops->writev(&s->ctx, fd, iov, iovcnt);
153: }
154:
155: static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
156: {
157: FsCred cred;
158: cred_init(&cred);
159: cred.fc_mode = mode;
160: return s->ops->chmod(&s->ctx, path->data, &cred);
161: }
162:
163: static int v9fs_do_mknod(V9fsState *s, V9fsCreateState *vs, mode_t mode,
164: dev_t dev)
165: {
166: FsCred cred;
167: cred_init(&cred);
168: cred.fc_uid = vs->fidp->uid;
169: cred.fc_mode = mode;
170: cred.fc_rdev = dev;
171: return s->ops->mknod(&s->ctx, vs->fullname.data, &cred);
172: }
173:
174: static int v9fs_do_mkdir(V9fsState *s, V9fsCreateState *vs)
175: {
176: FsCred cred;
177:
178: cred_init(&cred);
179: cred.fc_uid = vs->fidp->uid;
180: cred.fc_mode = vs->perm & 0777;
181:
182: return s->ops->mkdir(&s->ctx, vs->fullname.data, &cred);
183: }
184:
185: static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
186: {
187: return s->ops->fstat(&s->ctx, fd, stbuf);
188: }
189:
190: static int v9fs_do_open2(V9fsState *s, V9fsCreateState *vs)
191: {
192: FsCred cred;
193: int flags;
194:
195: cred_init(&cred);
196: cred.fc_uid = vs->fidp->uid;
197: cred.fc_mode = vs->perm & 0777;
198: flags = omode_to_uflags(vs->mode) | O_CREAT;
199:
200: return s->ops->open2(&s->ctx, vs->fullname.data, flags, &cred);
201: }
202:
203: static int v9fs_do_symlink(V9fsState *s, V9fsCreateState *vs)
204: {
205: FsCred cred;
206: cred_init(&cred);
207: cred.fc_uid = vs->fidp->uid;
208: cred.fc_mode = vs->perm | 0777;
209:
210: return s->ops->symlink(&s->ctx, vs->extension.data, vs->fullname.data,
211: &cred);
212: }
213:
214: static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
215: {
216: return s->ops->link(&s->ctx, oldpath->data, newpath->data);
217: }
218:
219: static int v9fs_do_truncate(V9fsState *s, V9fsString *path, off_t size)
220: {
221: return s->ops->truncate(&s->ctx, path->data, size);
222: }
223:
224: static int v9fs_do_rename(V9fsState *s, V9fsString *oldpath,
225: V9fsString *newpath)
226: {
227: return s->ops->rename(&s->ctx, oldpath->data, newpath->data);
228: }
229:
230: static int v9fs_do_chown(V9fsState *s, V9fsString *path, uid_t uid, gid_t gid)
231: {
232: FsCred cred;
233: cred_init(&cred);
234: cred.fc_uid = uid;
235: cred.fc_gid = gid;
236:
237: return s->ops->chown(&s->ctx, path->data, &cred);
238: }
239:
240: static int v9fs_do_utime(V9fsState *s, V9fsString *path,
241: const struct utimbuf *buf)
242: {
243: return s->ops->utime(&s->ctx, path->data, buf);
244: }
245:
246: static int v9fs_do_remove(V9fsState *s, V9fsString *path)
247: {
248: return s->ops->remove(&s->ctx, path->data);
249: }
250:
251: static int v9fs_do_fsync(V9fsState *s, int fd)
252: {
253: return s->ops->fsync(&s->ctx, fd);
254: }
255:
256: static void v9fs_string_init(V9fsString *str)
257: {
258: str->data = NULL;
259: str->size = 0;
260: }
261:
262: static void v9fs_string_free(V9fsString *str)
263: {
264: qemu_free(str->data);
265: str->data = NULL;
266: str->size = 0;
267: }
268:
269: static void v9fs_string_null(V9fsString *str)
270: {
271: v9fs_string_free(str);
272: }
273:
274: static int number_to_string(void *arg, char type)
275: {
276: unsigned int ret = 0;
277:
278: switch (type) {
279: case 'u': {
280: unsigned int num = *(unsigned int *)arg;
281:
282: do {
283: ret++;
284: num = num/10;
285: } while (num);
286: break;
287: }
288: default:
289: printf("Number_to_string: Unknown number format\n");
290: return -1;
291: }
292:
293: return ret;
294: }
295:
296: static int v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap)
297: {
298: va_list ap2;
299: char *iter = (char *)fmt;
300: int len = 0;
301: int nr_args = 0;
302: char *arg_char_ptr;
303: unsigned int arg_uint;
304:
305: /* Find the number of %'s that denotes an argument */
306: for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
307: nr_args++;
308: iter++;
309: }
310:
311: len = strlen(fmt) - 2*nr_args;
312:
313: if (!nr_args) {
314: goto alloc_print;
315: }
316:
317: va_copy(ap2, ap);
318:
319: iter = (char *)fmt;
320:
321: /* Now parse the format string */
322: for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
323: iter++;
324: switch (*iter) {
325: case 'u':
326: arg_uint = va_arg(ap2, unsigned int);
327: len += number_to_string((void *)&arg_uint, 'u');
328: break;
329: case 's':
330: arg_char_ptr = va_arg(ap2, char *);
331: len += strlen(arg_char_ptr);
332: break;
333: case 'c':
334: len += 1;
335: break;
336: default:
337: fprintf(stderr,
338: "v9fs_string_alloc_printf:Incorrect format %c", *iter);
339: return -1;
340: }
341: iter++;
342: }
343:
344: alloc_print:
345: *strp = qemu_malloc((len + 1) * sizeof(**strp));
346:
347: return vsprintf(*strp, fmt, ap);
348: }
349:
350: static void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
351: {
352: va_list ap;
353: int err;
354:
355: v9fs_string_free(str);
356:
357: va_start(ap, fmt);
358: err = v9fs_string_alloc_printf(&str->data, fmt, ap);
359: BUG_ON(err == -1);
360: va_end(ap);
361:
362: str->size = err;
363: }
364:
365: static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
366: {
367: v9fs_string_free(lhs);
368: v9fs_string_sprintf(lhs, "%s", rhs->data);
369: }
370:
371: static size_t v9fs_string_size(V9fsString *str)
372: {
373: return str->size;
374: }
375:
376: static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
377: {
378: V9fsFidState *f;
379:
380: for (f = s->fid_list; f; f = f->next) {
381: if (f->fid == fid) {
382: return f;
383: }
384: }
385:
386: return NULL;
387: }
388:
389: static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
390: {
391: V9fsFidState *f;
392:
393: f = lookup_fid(s, fid);
394: if (f) {
395: return NULL;
396: }
397:
398: f = qemu_mallocz(sizeof(V9fsFidState));
399:
400: f->fid = fid;
401: f->fd = -1;
402: f->dir = NULL;
403:
404: f->next = s->fid_list;
405: s->fid_list = f;
406:
407: return f;
408: }
409:
410: static int free_fid(V9fsState *s, int32_t fid)
411: {
412: V9fsFidState **fidpp, *fidp;
413:
414: for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
415: if ((*fidpp)->fid == fid) {
416: break;
417: }
418: }
419:
420: if (*fidpp == NULL) {
421: return -ENOENT;
422: }
423:
424: fidp = *fidpp;
425: *fidpp = fidp->next;
426:
427: if (fidp->fd != -1) {
428: v9fs_do_close(s, fidp->fd);
429: }
430: if (fidp->dir) {
431: v9fs_do_closedir(s, fidp->dir);
432: }
433: v9fs_string_free(&fidp->path);
434: qemu_free(fidp);
435:
436: return 0;
437: }
438:
439: #define P9_QID_TYPE_DIR 0x80
440: #define P9_QID_TYPE_SYMLINK 0x02
441:
442: #define P9_STAT_MODE_DIR 0x80000000
443: #define P9_STAT_MODE_APPEND 0x40000000
444: #define P9_STAT_MODE_EXCL 0x20000000
445: #define P9_STAT_MODE_MOUNT 0x10000000
446: #define P9_STAT_MODE_AUTH 0x08000000
447: #define P9_STAT_MODE_TMP 0x04000000
448: #define P9_STAT_MODE_SYMLINK 0x02000000
449: #define P9_STAT_MODE_LINK 0x01000000
450: #define P9_STAT_MODE_DEVICE 0x00800000
451: #define P9_STAT_MODE_NAMED_PIPE 0x00200000
452: #define P9_STAT_MODE_SOCKET 0x00100000
453: #define P9_STAT_MODE_SETUID 0x00080000
454: #define P9_STAT_MODE_SETGID 0x00040000
455: #define P9_STAT_MODE_SETVTX 0x00010000
456:
457: #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
458: P9_STAT_MODE_SYMLINK | \
459: P9_STAT_MODE_LINK | \
460: P9_STAT_MODE_DEVICE | \
461: P9_STAT_MODE_NAMED_PIPE | \
462: P9_STAT_MODE_SOCKET)
463:
464: /* This is the algorithm from ufs in spfs */
465: static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
466: {
467: size_t size;
468:
469: size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
470: memcpy(&qidp->path, &stbuf->st_ino, size);
471: qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
472: qidp->type = 0;
473: if (S_ISDIR(stbuf->st_mode)) {
474: qidp->type |= P9_QID_TYPE_DIR;
475: }
476: if (S_ISLNK(stbuf->st_mode)) {
477: qidp->type |= P9_QID_TYPE_SYMLINK;
478: }
479: }
480:
481: static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp)
482: {
483: struct stat stbuf;
484: int err;
485:
486: err = v9fs_do_lstat(s, &fidp->path, &stbuf);
487: if (err) {
488: return err;
489: }
490:
491: stat_to_qid(&stbuf, qidp);
492: return 0;
493: }
494:
495: static V9fsPDU *alloc_pdu(V9fsState *s)
496: {
497: V9fsPDU *pdu = NULL;
498:
499: if (!QLIST_EMPTY(&s->free_list)) {
500: pdu = QLIST_FIRST(&s->free_list);
501: QLIST_REMOVE(pdu, next);
502: }
503: return pdu;
504: }
505:
506: static void free_pdu(V9fsState *s, V9fsPDU *pdu)
507: {
508: if (pdu) {
509: QLIST_INSERT_HEAD(&s->free_list, pdu, next);
510: }
511: }
512:
513: size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
514: size_t offset, size_t size, int pack)
515: {
516: int i = 0;
517: size_t copied = 0;
518:
519: for (i = 0; size && i < sg_count; i++) {
520: size_t len;
521: if (offset >= sg[i].iov_len) {
522: /* skip this sg */
523: offset -= sg[i].iov_len;
524: continue;
525: } else {
526: len = MIN(sg[i].iov_len - offset, size);
527: if (pack) {
528: memcpy(sg[i].iov_base + offset, addr, len);
529: } else {
530: memcpy(addr, sg[i].iov_base + offset, len);
531: }
532: size -= len;
533: copied += len;
534: addr += len;
535: if (size) {
536: offset = 0;
537: continue;
538: }
539: }
540: }
541:
542: return copied;
543: }
544:
545: static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
546: {
547: return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
548: offset, size, 0);
549: }
550:
551: static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
552: size_t size)
553: {
554: return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
555: offset, size, 1);
556: }
557:
558: static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
559: {
560: size_t pos = 0;
561: int i, j;
562: struct iovec *src_sg;
563: unsigned int num;
564:
565: if (rx) {
566: src_sg = pdu->elem.in_sg;
567: num = pdu->elem.in_num;
568: } else {
569: src_sg = pdu->elem.out_sg;
570: num = pdu->elem.out_num;
571: }
572:
573: j = 0;
574: for (i = 0; i < num; i++) {
575: if (offset <= pos) {
576: sg[j].iov_base = src_sg[i].iov_base;
577: sg[j].iov_len = src_sg[i].iov_len;
578: j++;
579: } else if (offset < (src_sg[i].iov_len + pos)) {
580: sg[j].iov_base = src_sg[i].iov_base;
581: sg[j].iov_len = src_sg[i].iov_len;
582: sg[j].iov_base += (offset - pos);
583: sg[j].iov_len -= (offset - pos);
584: j++;
585: }
586: pos += src_sg[i].iov_len;
587: }
588:
589: return j;
590: }
591:
592: static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
593: {
594: size_t old_offset = offset;
595: va_list ap;
596: int i;
597:
598: va_start(ap, fmt);
599: for (i = 0; fmt[i]; i++) {
600: switch (fmt[i]) {
601: case 'b': {
602: uint8_t *valp = va_arg(ap, uint8_t *);
603: offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
604: break;
605: }
606: case 'w': {
607: uint16_t val, *valp;
608: valp = va_arg(ap, uint16_t *);
609: val = le16_to_cpupu(valp);
610: offset += pdu_unpack(&val, pdu, offset, sizeof(val));
611: *valp = val;
612: break;
613: }
614: case 'd': {
615: uint32_t val, *valp;
616: valp = va_arg(ap, uint32_t *);
617: val = le32_to_cpupu(valp);
618: offset += pdu_unpack(&val, pdu, offset, sizeof(val));
619: *valp = val;
620: break;
621: }
622: case 'q': {
623: uint64_t val, *valp;
624: valp = va_arg(ap, uint64_t *);
625: val = le64_to_cpup(valp);
626: offset += pdu_unpack(&val, pdu, offset, sizeof(val));
627: *valp = val;
628: break;
629: }
630: case 'v': {
631: struct iovec *iov = va_arg(ap, struct iovec *);
632: int *iovcnt = va_arg(ap, int *);
633: *iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
634: break;
635: }
636: case 's': {
637: V9fsString *str = va_arg(ap, V9fsString *);
638: offset += pdu_unmarshal(pdu, offset, "w", &str->size);
639: /* FIXME: sanity check str->size */
640: str->data = qemu_malloc(str->size + 1);
641: offset += pdu_unpack(str->data, pdu, offset, str->size);
642: str->data[str->size] = 0;
643: break;
644: }
645: case 'Q': {
646: V9fsQID *qidp = va_arg(ap, V9fsQID *);
647: offset += pdu_unmarshal(pdu, offset, "bdq",
648: &qidp->type, &qidp->version, &qidp->path);
649: break;
650: }
651: case 'S': {
652: V9fsStat *statp = va_arg(ap, V9fsStat *);
653: offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
654: &statp->size, &statp->type, &statp->dev,
655: &statp->qid, &statp->mode, &statp->atime,
656: &statp->mtime, &statp->length,
657: &statp->name, &statp->uid, &statp->gid,
658: &statp->muid, &statp->extension,
659: &statp->n_uid, &statp->n_gid,
660: &statp->n_muid);
661: break;
662: }
663: default:
664: break;
665: }
666: }
667:
668: va_end(ap);
669:
670: return offset - old_offset;
671: }
672:
673: static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
674: {
675: size_t old_offset = offset;
676: va_list ap;
677: int i;
678:
679: va_start(ap, fmt);
680: for (i = 0; fmt[i]; i++) {
681: switch (fmt[i]) {
682: case 'b': {
683: uint8_t val = va_arg(ap, int);
684: offset += pdu_pack(pdu, offset, &val, sizeof(val));
685: break;
686: }
687: case 'w': {
688: uint16_t val;
689: cpu_to_le16w(&val, va_arg(ap, int));
690: offset += pdu_pack(pdu, offset, &val, sizeof(val));
691: break;
692: }
693: case 'd': {
694: uint32_t val;
695: cpu_to_le32w(&val, va_arg(ap, uint32_t));
696: offset += pdu_pack(pdu, offset, &val, sizeof(val));
697: break;
698: }
699: case 'q': {
700: uint64_t val;
701: cpu_to_le64w(&val, va_arg(ap, uint64_t));
702: offset += pdu_pack(pdu, offset, &val, sizeof(val));
703: break;
704: }
705: case 'v': {
706: struct iovec *iov = va_arg(ap, struct iovec *);
707: int *iovcnt = va_arg(ap, int *);
708: *iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
709: break;
710: }
711: case 's': {
712: V9fsString *str = va_arg(ap, V9fsString *);
713: offset += pdu_marshal(pdu, offset, "w", str->size);
714: offset += pdu_pack(pdu, offset, str->data, str->size);
715: break;
716: }
717: case 'Q': {
718: V9fsQID *qidp = va_arg(ap, V9fsQID *);
719: offset += pdu_marshal(pdu, offset, "bdq",
720: qidp->type, qidp->version, qidp->path);
721: break;
722: }
723: case 'S': {
724: V9fsStat *statp = va_arg(ap, V9fsStat *);
725: offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
726: statp->size, statp->type, statp->dev,
727: &statp->qid, statp->mode, statp->atime,
728: statp->mtime, statp->length, &statp->name,
729: &statp->uid, &statp->gid, &statp->muid,
730: &statp->extension, statp->n_uid,
731: statp->n_gid, statp->n_muid);
732: break;
733: }
734: default:
735: break;
736: }
737: }
738: va_end(ap);
739:
740: return offset - old_offset;
741: }
742:
743: static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
744: {
745: int8_t id = pdu->id + 1; /* Response */
746:
747: if (len < 0) {
748: V9fsString str;
749: int err = -len;
750:
751: str.data = strerror(err);
752: str.size = strlen(str.data);
753:
754: len = 7;
755: len += pdu_marshal(pdu, len, "s", &str);
756: if (dotu) {
757: len += pdu_marshal(pdu, len, "d", err);
758: }
759:
760: id = P9_RERROR;
761: }
762:
763: /* fill out the header */
764: pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
765:
766: /* keep these in sync */
767: pdu->size = len;
768: pdu->id = id;
769:
770: /* push onto queue and notify */
771: virtqueue_push(s->vq, &pdu->elem, len);
772:
773: /* FIXME: we should batch these completions */
774: virtio_notify(&s->vdev, s->vq);
775:
776: free_pdu(s, pdu);
777: }
778:
779: static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
780: {
781: mode_t ret;
782:
783: ret = mode & 0777;
784: if (mode & P9_STAT_MODE_DIR) {
785: ret |= S_IFDIR;
786: }
787:
788: if (dotu) {
789: if (mode & P9_STAT_MODE_SYMLINK) {
790: ret |= S_IFLNK;
791: }
792: if (mode & P9_STAT_MODE_SOCKET) {
793: ret |= S_IFSOCK;
794: }
795: if (mode & P9_STAT_MODE_NAMED_PIPE) {
796: ret |= S_IFIFO;
797: }
798: if (mode & P9_STAT_MODE_DEVICE) {
799: if (extension && extension->data[0] == 'c') {
800: ret |= S_IFCHR;
801: } else {
802: ret |= S_IFBLK;
803: }
804: }
805: }
806:
807: if (!(ret&~0777)) {
808: ret |= S_IFREG;
809: }
810:
811: if (mode & P9_STAT_MODE_SETUID) {
812: ret |= S_ISUID;
813: }
814: if (mode & P9_STAT_MODE_SETGID) {
815: ret |= S_ISGID;
816: }
817: if (mode & P9_STAT_MODE_SETVTX) {
818: ret |= S_ISVTX;
819: }
820:
821: return ret;
822: }
823:
824: static int donttouch_stat(V9fsStat *stat)
825: {
826: if (stat->type == -1 &&
827: stat->dev == -1 &&
828: stat->qid.type == -1 &&
829: stat->qid.version == -1 &&
830: stat->qid.path == -1 &&
831: stat->mode == -1 &&
832: stat->atime == -1 &&
833: stat->mtime == -1 &&
834: stat->length == -1 &&
835: !stat->name.size &&
836: !stat->uid.size &&
837: !stat->gid.size &&
838: !stat->muid.size &&
839: stat->n_uid == -1 &&
840: stat->n_gid == -1 &&
841: stat->n_muid == -1) {
842: return 1;
843: }
844:
845: return 0;
846: }
847:
848: static void v9fs_stat_free(V9fsStat *stat)
849: {
850: v9fs_string_free(&stat->name);
851: v9fs_string_free(&stat->uid);
852: v9fs_string_free(&stat->gid);
853: v9fs_string_free(&stat->muid);
854: v9fs_string_free(&stat->extension);
855: }
856:
857: static uint32_t stat_to_v9mode(const struct stat *stbuf)
858: {
859: uint32_t mode;
860:
861: mode = stbuf->st_mode & 0777;
862: if (S_ISDIR(stbuf->st_mode)) {
863: mode |= P9_STAT_MODE_DIR;
864: }
865:
866: if (dotu) {
867: if (S_ISLNK(stbuf->st_mode)) {
868: mode |= P9_STAT_MODE_SYMLINK;
869: }
870:
871: if (S_ISSOCK(stbuf->st_mode)) {
872: mode |= P9_STAT_MODE_SOCKET;
873: }
874:
875: if (S_ISFIFO(stbuf->st_mode)) {
876: mode |= P9_STAT_MODE_NAMED_PIPE;
877: }
878:
879: if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
880: mode |= P9_STAT_MODE_DEVICE;
881: }
882:
883: if (stbuf->st_mode & S_ISUID) {
884: mode |= P9_STAT_MODE_SETUID;
885: }
886:
887: if (stbuf->st_mode & S_ISGID) {
888: mode |= P9_STAT_MODE_SETGID;
889: }
890:
891: if (stbuf->st_mode & S_ISVTX) {
892: mode |= P9_STAT_MODE_SETVTX;
893: }
894: }
895:
896: return mode;
897: }
898:
899: static int stat_to_v9stat(V9fsState *s, V9fsString *name,
900: const struct stat *stbuf,
901: V9fsStat *v9stat)
902: {
903: int err;
904: const char *str;
905:
906: memset(v9stat, 0, sizeof(*v9stat));
907:
908: stat_to_qid(stbuf, &v9stat->qid);
909: v9stat->mode = stat_to_v9mode(stbuf);
910: v9stat->atime = stbuf->st_atime;
911: v9stat->mtime = stbuf->st_mtime;
912: v9stat->length = stbuf->st_size;
913:
914: v9fs_string_null(&v9stat->uid);
915: v9fs_string_null(&v9stat->gid);
916: v9fs_string_null(&v9stat->muid);
917:
918: if (dotu) {
919: v9stat->n_uid = stbuf->st_uid;
920: v9stat->n_gid = stbuf->st_gid;
921: v9stat->n_muid = 0;
922:
923: v9fs_string_null(&v9stat->extension);
924:
925: if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
926: err = v9fs_do_readlink(s, name, &v9stat->extension);
927: if (err == -1) {
928: err = -errno;
929: return err;
930: }
931: v9stat->extension.data[err] = 0;
932: v9stat->extension.size = err;
933: } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
934: v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
935: S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
936: major(stbuf->st_rdev), minor(stbuf->st_rdev));
937: } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
938: v9fs_string_sprintf(&v9stat->extension, "%s %u",
939: "HARDLINKCOUNT", stbuf->st_nlink);
940: }
941: }
942:
943: str = strrchr(name->data, '/');
944: if (str) {
945: str += 1;
946: } else {
947: str = name->data;
948: }
949:
950: v9fs_string_sprintf(&v9stat->name, "%s", str);
951:
952: v9stat->size = 61 +
953: v9fs_string_size(&v9stat->name) +
954: v9fs_string_size(&v9stat->uid) +
955: v9fs_string_size(&v9stat->gid) +
956: v9fs_string_size(&v9stat->muid) +
957: v9fs_string_size(&v9stat->extension);
958: return 0;
959: }
960:
961: static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
962: {
963: while (len && *iovcnt) {
964: if (len < sg->iov_len) {
965: sg->iov_len -= len;
966: sg->iov_base += len;
967: len = 0;
968: } else {
969: len -= sg->iov_len;
970: sg++;
971: *iovcnt -= 1;
972: }
973: }
974:
975: return sg;
976: }
977:
978: static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
979: {
980: int i;
981: int total = 0;
982:
983: for (i = 0; i < *cnt; i++) {
984: if ((total + sg[i].iov_len) > cap) {
985: sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
986: i++;
987: break;
988: }
989: total += sg[i].iov_len;
990: }
991:
992: *cnt = i;
993:
994: return sg;
995: }
996:
997: static void print_sg(struct iovec *sg, int cnt)
998: {
999: int i;
1000:
1001: printf("sg[%d]: {", cnt);
1002: for (i = 0; i < cnt; i++) {
1003: if (i) {
1004: printf(", ");
1005: }
1006: printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
1007: }
1008: printf("}\n");
1009: }
1010:
1011: static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
1012: {
1013: V9fsString str;
1014: v9fs_string_init(&str);
1015: v9fs_string_copy(&str, dst);
1016: v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
1017: v9fs_string_free(&str);
1018: }
1019:
1020: static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
1021: {
1022: int32_t msize;
1023: V9fsString version;
1024: size_t offset = 7;
1025:
1026: pdu_unmarshal(pdu, offset, "ds", &msize, &version);
1027:
1028: if (strcmp(version.data, "9P2000.u")) {
1029: v9fs_string_sprintf(&version, "unknown");
1030: }
1031:
1032: offset += pdu_marshal(pdu, offset, "ds", msize, &version);
1033: complete_pdu(s, pdu, offset);
1034:
1035: v9fs_string_free(&version);
1036: }
1037:
1038: static void v9fs_attach(V9fsState *s, V9fsPDU *pdu)
1039: {
1040: int32_t fid, afid, n_uname;
1041: V9fsString uname, aname;
1042: V9fsFidState *fidp;
1043: V9fsQID qid;
1044: size_t offset = 7;
1045: ssize_t err;
1046:
1047: pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
1048:
1049: fidp = alloc_fid(s, fid);
1050: if (fidp == NULL) {
1051: err = -EINVAL;
1052: goto out;
1053: }
1054:
1055: fidp->uid = n_uname;
1056:
1057: v9fs_string_sprintf(&fidp->path, "%s", "/");
1058: err = fid_to_qid(s, fidp, &qid);
1059: if (err) {
1060: err = -EINVAL;
1061: free_fid(s, fid);
1062: goto out;
1063: }
1064:
1065: offset += pdu_marshal(pdu, offset, "Q", &qid);
1066:
1067: err = offset;
1068: out:
1069: complete_pdu(s, pdu, err);
1070: v9fs_string_free(&uname);
1071: v9fs_string_free(&aname);
1072: }
1073:
1074: static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err)
1075: {
1076: if (err == -1) {
1077: err = -errno;
1078: goto out;
1079: }
1080:
1081: err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat);
1082: if (err) {
1083: goto out;
1084: }
1085: vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat);
1086: err = vs->offset;
1087:
1088: out:
1089: complete_pdu(s, vs->pdu, err);
1090: v9fs_stat_free(&vs->v9stat);
1091: qemu_free(vs);
1092: }
1093:
1094: static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
1095: {
1096: int32_t fid;
1097: V9fsStatState *vs;
1098: ssize_t err = 0;
1099:
1100: vs = qemu_malloc(sizeof(*vs));
1101: vs->pdu = pdu;
1102: vs->offset = 7;
1103:
1104: memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1105:
1106: pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
1107:
1108: vs->fidp = lookup_fid(s, fid);
1109: if (vs->fidp == NULL) {
1110: err = -ENOENT;
1111: goto out;
1112: }
1113:
1114: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1115: v9fs_stat_post_lstat(s, vs, err);
1116: return;
1117:
1118: out:
1119: complete_pdu(s, vs->pdu, err);
1120: v9fs_stat_free(&vs->v9stat);
1121: qemu_free(vs);
1122: }
1123:
1124: static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err)
1125: {
1126: complete_pdu(s, vs->pdu, err);
1127:
1128: if (vs->nwnames) {
1129: for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) {
1130: v9fs_string_free(&vs->wnames[vs->name_idx]);
1131: }
1132:
1133: qemu_free(vs->wnames);
1134: qemu_free(vs->qids);
1135: }
1136: }
1137:
1138: static void v9fs_walk_marshal(V9fsWalkState *vs)
1139: {
1140: int i;
1141: vs->offset = 7;
1142: vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
1143:
1144: for (i = 0; i < vs->nwnames; i++) {
1145: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
1146: }
1147: }
1148:
1149: static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs,
1150: int err)
1151: {
1152: if (err == -1) {
1153: free_fid(s, vs->newfidp->fid);
1154: v9fs_string_free(&vs->path);
1155: err = -ENOENT;
1156: goto out;
1157: }
1158:
1159: stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1160:
1161: vs->name_idx++;
1162: if (vs->name_idx < vs->nwnames) {
1163: v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1164: vs->wnames[vs->name_idx].data);
1165: v9fs_string_copy(&vs->newfidp->path, &vs->path);
1166:
1167: err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1168: v9fs_walk_post_newfid_lstat(s, vs, err);
1169: return;
1170: }
1171:
1172: v9fs_string_free(&vs->path);
1173: v9fs_walk_marshal(vs);
1174: err = vs->offset;
1175: out:
1176: v9fs_walk_complete(s, vs, err);
1177: }
1178:
1179: static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs,
1180: int err)
1181: {
1182: if (err == -1) {
1183: v9fs_string_free(&vs->path);
1184: err = -ENOENT;
1185: goto out;
1186: }
1187:
1188: stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1189: vs->name_idx++;
1190: if (vs->name_idx < vs->nwnames) {
1191:
1192: v9fs_string_sprintf(&vs->path, "%s/%s",
1193: vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1194: v9fs_string_copy(&vs->fidp->path, &vs->path);
1195:
1196: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1197: v9fs_walk_post_oldfid_lstat(s, vs, err);
1198: return;
1199: }
1200:
1201: v9fs_string_free(&vs->path);
1202: v9fs_walk_marshal(vs);
1203: err = vs->offset;
1204: out:
1205: v9fs_walk_complete(s, vs, err);
1206: }
1207:
1208: static void v9fs_walk(V9fsState *s, V9fsPDU *pdu)
1209: {
1210: int32_t fid, newfid;
1211: V9fsWalkState *vs;
1212: int err = 0;
1213: int i;
1214:
1215: vs = qemu_malloc(sizeof(*vs));
1216: vs->pdu = pdu;
1217: vs->wnames = NULL;
1218: vs->qids = NULL;
1219: vs->offset = 7;
1220:
1221: vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
1222: &newfid, &vs->nwnames);
1223:
1224: if (vs->nwnames) {
1225: vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames);
1226:
1227: vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames);
1228:
1229: for (i = 0; i < vs->nwnames; i++) {
1230: vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
1231: &vs->wnames[i]);
1232: }
1233: }
1234:
1235: vs->fidp = lookup_fid(s, fid);
1236: if (vs->fidp == NULL) {
1237: err = -ENOENT;
1238: goto out;
1239: }
1240:
1241: /* FIXME: is this really valid? */
1242: if (fid == newfid) {
1243:
1244: BUG_ON(vs->fidp->fd != -1);
1245: BUG_ON(vs->fidp->dir);
1246: v9fs_string_init(&vs->path);
1247: vs->name_idx = 0;
1248:
1249: if (vs->name_idx < vs->nwnames) {
1250: v9fs_string_sprintf(&vs->path, "%s/%s",
1251: vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1252: v9fs_string_copy(&vs->fidp->path, &vs->path);
1253:
1254: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1255: v9fs_walk_post_oldfid_lstat(s, vs, err);
1256: return;
1257: }
1258: } else {
1259: vs->newfidp = alloc_fid(s, newfid);
1260: if (vs->newfidp == NULL) {
1261: err = -EINVAL;
1262: goto out;
1263: }
1264:
1265: vs->newfidp->uid = vs->fidp->uid;
1266: v9fs_string_init(&vs->path);
1267: vs->name_idx = 0;
1268: v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path);
1269:
1270: if (vs->name_idx < vs->nwnames) {
1271: v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1272: vs->wnames[vs->name_idx].data);
1273: v9fs_string_copy(&vs->newfidp->path, &vs->path);
1274:
1275: err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1276: v9fs_walk_post_newfid_lstat(s, vs, err);
1277: return;
1278: }
1279: }
1280:
1281: v9fs_walk_marshal(vs);
1282: err = vs->offset;
1283: out:
1284: v9fs_walk_complete(s, vs, err);
1285: }
1286:
1287: static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err)
1288: {
1289: if (vs->fidp->dir == NULL) {
1290: err = -errno;
1291: goto out;
1292: }
1293:
1294: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1295: err = vs->offset;
1296: out:
1297: complete_pdu(s, vs->pdu, err);
1298: qemu_free(vs);
1299:
1300: }
1301:
1302: static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
1303: {
1304: if (vs->fidp->fd == -1) {
1305: err = -errno;
1306: goto out;
1307: }
1308:
1309: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1310: err = vs->offset;
1311: out:
1312: complete_pdu(s, vs->pdu, err);
1313: qemu_free(vs);
1314: }
1315:
1316: static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
1317: {
1318: if (err) {
1319: err = -errno;
1320: goto out;
1321: }
1322:
1323: stat_to_qid(&vs->stbuf, &vs->qid);
1324:
1325: if (S_ISDIR(vs->stbuf.st_mode)) {
1326: vs->fidp->dir = v9fs_do_opendir(s, &vs->fidp->path);
1327: v9fs_open_post_opendir(s, vs, err);
1328: } else {
1329: vs->fidp->fd = v9fs_do_open(s, &vs->fidp->path,
1330: omode_to_uflags(vs->mode));
1331: v9fs_open_post_open(s, vs, err);
1332: }
1333: return;
1334: out:
1335: complete_pdu(s, vs->pdu, err);
1336: qemu_free(vs);
1337: }
1338:
1339: static void v9fs_open(V9fsState *s, V9fsPDU *pdu)
1340: {
1341: int32_t fid;
1342: V9fsOpenState *vs;
1343: ssize_t err = 0;
1344:
1345:
1346: vs = qemu_malloc(sizeof(*vs));
1347: vs->pdu = pdu;
1348: vs->offset = 7;
1349:
1350: pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
1351:
1352: vs->fidp = lookup_fid(s, fid);
1353: if (vs->fidp == NULL) {
1354: err = -ENOENT;
1355: goto out;
1356: }
1357:
1358: BUG_ON(vs->fidp->fd != -1);
1359: BUG_ON(vs->fidp->dir);
1360:
1361: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1362:
1363: v9fs_open_post_lstat(s, vs, err);
1364: return;
1365: out:
1366: complete_pdu(s, pdu, err);
1367: qemu_free(vs);
1368: }
1369:
1370: static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
1371: {
1372: int32_t fid;
1373: size_t offset = 7;
1374: int err;
1375:
1376: pdu_unmarshal(pdu, offset, "d", &fid);
1377:
1378: err = free_fid(s, fid);
1379: if (err < 0) {
1380: goto out;
1381: }
1382:
1383: offset = 7;
1384: err = offset;
1385: out:
1386: complete_pdu(s, pdu, err);
1387: }
1388:
1389: static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
1390:
1391: static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1392: {
1393: if (err) {
1394: goto out;
1395: }
1396: v9fs_stat_free(&vs->v9stat);
1397: v9fs_string_free(&vs->name);
1398: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1399: vs->offset += vs->count;
1400: err = vs->offset;
1401: out:
1402: complete_pdu(s, vs->pdu, err);
1403: qemu_free(vs);
1404: return;
1405: }
1406:
1407: static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
1408: ssize_t err)
1409: {
1410: if (err) {
1411: err = -errno;
1412: goto out;
1413: }
1414: err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
1415: if (err) {
1416: goto out;
1417: }
1418:
1419: vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
1420: &vs->v9stat);
1421: if ((vs->len != (vs->v9stat.size + 2)) ||
1422: ((vs->count + vs->len) > vs->max_count)) {
1423: v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos);
1424: v9fs_read_post_seekdir(s, vs, err);
1425: return;
1426: }
1427: vs->count += vs->len;
1428: v9fs_stat_free(&vs->v9stat);
1429: v9fs_string_free(&vs->name);
1430: vs->dir_pos = vs->dent->d_off;
1431: vs->dent = v9fs_do_readdir(s, vs->fidp->dir);
1432: v9fs_read_post_readdir(s, vs, err);
1433: return;
1434: out:
1435: v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos);
1436: v9fs_read_post_seekdir(s, vs, err);
1437: return;
1438:
1439: }
1440:
1441: static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1442: {
1443: if (vs->dent) {
1444: memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1445: v9fs_string_init(&vs->name);
1446: v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
1447: vs->dent->d_name);
1448: err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
1449: v9fs_read_post_dir_lstat(s, vs, err);
1450: return;
1451: }
1452:
1453: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1454: vs->offset += vs->count;
1455: err = vs->offset;
1456: complete_pdu(s, vs->pdu, err);
1457: qemu_free(vs);
1458: return;
1459: }
1460:
1461: static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1462: {
1463: vs->dent = v9fs_do_readdir(s, vs->fidp->dir);
1464: v9fs_read_post_readdir(s, vs, err);
1465: return;
1466: }
1467:
1468: static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
1469: ssize_t err)
1470: {
1471: vs->dir_pos = v9fs_do_telldir(s, vs->fidp->dir);
1472: v9fs_read_post_telldir(s, vs, err);
1473: return;
1474: }
1475:
1476: static void v9fs_read_post_readv(V9fsState *s, V9fsReadState *vs, ssize_t err)
1477: {
1478: if (err < 0) {
1479: /* IO error return the error */
1480: err = -errno;
1481: goto out;
1482: }
1483: vs->total += vs->len;
1484: vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
1485: if (vs->total < vs->count && vs->len > 0) {
1486: do {
1487: if (0) {
1488: print_sg(vs->sg, vs->cnt);
1489: }
1490: vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt);
1491: } while (vs->len == -1 && errno == EINTR);
1492: if (vs->len == -1) {
1493: err = -errno;
1494: }
1495: v9fs_read_post_readv(s, vs, err);
1496: return;
1497: }
1498: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
1499: vs->offset += vs->count;
1500: err = vs->offset;
1501:
1502: out:
1503: complete_pdu(s, vs->pdu, err);
1504: qemu_free(vs);
1505: }
1506:
1507: static void v9fs_read_post_lseek(V9fsState *s, V9fsReadState *vs, ssize_t err)
1508: {
1509: if (err == -1) {
1510: err = -errno;
1511: goto out;
1512: }
1513: vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
1514:
1515: if (vs->total < vs->count) {
1516: do {
1517: if (0) {
1518: print_sg(vs->sg, vs->cnt);
1519: }
1520: vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt);
1521: } while (vs->len == -1 && errno == EINTR);
1522: if (vs->len == -1) {
1523: err = -errno;
1524: }
1525: v9fs_read_post_readv(s, vs, err);
1526: return;
1527: }
1528: out:
1529: complete_pdu(s, vs->pdu, err);
1530: qemu_free(vs);
1531: }
1532:
1533: static void v9fs_read(V9fsState *s, V9fsPDU *pdu)
1534: {
1535: int32_t fid;
1536: V9fsReadState *vs;
1537: ssize_t err = 0;
1538:
1539: vs = qemu_malloc(sizeof(*vs));
1540: vs->pdu = pdu;
1541: vs->offset = 7;
1542: vs->total = 0;
1543: vs->len = 0;
1544: vs->count = 0;
1545:
1546: pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
1547:
1548: vs->fidp = lookup_fid(s, fid);
1549: if (vs->fidp == NULL) {
1550: err = -EINVAL;
1551: goto out;
1552: }
1553:
1554: if (vs->fidp->dir) {
1555: vs->max_count = vs->count;
1556: vs->count = 0;
1557: if (vs->off == 0) {
1558: v9fs_do_rewinddir(s, vs->fidp->dir);
1559: }
1560: v9fs_read_post_rewinddir(s, vs, err);
1561: return;
1562: } else if (vs->fidp->fd != -1) {
1563: vs->sg = vs->iov;
1564: pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
1565: err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET);
1566: v9fs_read_post_lseek(s, vs, err);
1567: return;
1568: } else {
1569: err = -EINVAL;
1570: }
1571: out:
1572: complete_pdu(s, pdu, err);
1573: qemu_free(vs);
1574: }
1575:
1576: static void v9fs_write_post_writev(V9fsState *s, V9fsWriteState *vs,
1577: ssize_t err)
1578: {
1579: if (err < 0) {
1580: /* IO error return the error */
1581: err = -errno;
1582: goto out;
1583: }
1584: vs->total += vs->len;
1585: vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
1586: if (vs->total < vs->count && vs->len > 0) {
1587: do {
1588: if (0) {
1589: print_sg(vs->sg, vs->cnt);
1590: }
1591: vs->len = v9fs_do_writev(s, vs->fidp->fd, vs->sg, vs->cnt);
1592: } while (vs->len == -1 && errno == EINTR);
1593: if (vs->len == -1) {
1594: err = -errno;
1595: }
1596: v9fs_write_post_writev(s, vs, err);
1597: return;
1598: }
1599: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
1600:
1601: err = vs->offset;
1602: out:
1603: complete_pdu(s, vs->pdu, err);
1604: qemu_free(vs);
1605: }
1606:
1607: static void v9fs_write_post_lseek(V9fsState *s, V9fsWriteState *vs, ssize_t err)
1608: {
1609: if (err == -1) {
1610: err = -errno;
1611: goto out;
1612: }
1613: vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
1614:
1615: if (vs->total < vs->count) {
1616: do {
1617: if (0) {
1618: print_sg(vs->sg, vs->cnt);
1619: }
1620: vs->len = v9fs_do_writev(s, vs->fidp->fd, vs->sg, vs->cnt);
1621: } while (vs->len == -1 && errno == EINTR);
1622: if (vs->len == -1) {
1623: err = -errno;
1624: }
1625: v9fs_write_post_writev(s, vs, err);
1626: return;
1627: }
1628:
1629: out:
1630: complete_pdu(s, vs->pdu, err);
1631: qemu_free(vs);
1632: }
1633:
1634: static void v9fs_write(V9fsState *s, V9fsPDU *pdu)
1635: {
1636: int32_t fid;
1637: V9fsWriteState *vs;
1638: ssize_t err;
1639:
1640: vs = qemu_malloc(sizeof(*vs));
1641:
1642: vs->pdu = pdu;
1643: vs->offset = 7;
1644: vs->sg = vs->iov;
1645: vs->total = 0;
1646: vs->len = 0;
1647:
1648: pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
1649: vs->sg, &vs->cnt);
1650:
1651: vs->fidp = lookup_fid(s, fid);
1652: if (vs->fidp == NULL) {
1653: err = -EINVAL;
1654: goto out;
1655: }
1656:
1657: if (vs->fidp->fd == -1) {
1658: err = -EINVAL;
1659: goto out;
1660: }
1661:
1662: err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET);
1663:
1664: v9fs_write_post_lseek(s, vs, err);
1665: return;
1666:
1667: out:
1668: complete_pdu(s, vs->pdu, err);
1669: qemu_free(vs);
1670: }
1671:
1672: static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
1673: {
1674: if (err == 0) {
1675: v9fs_string_copy(&vs->fidp->path, &vs->fullname);
1676: stat_to_qid(&vs->stbuf, &vs->qid);
1677:
1678: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1679:
1680: err = vs->offset;
1681: }
1682:
1683: complete_pdu(s, vs->pdu, err);
1684: v9fs_string_free(&vs->name);
1685: v9fs_string_free(&vs->extension);
1686: v9fs_string_free(&vs->fullname);
1687: qemu_free(vs);
1688: }
1689:
1690: static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err)
1691: {
1692: if (err) {
1693: err = -errno;
1694: }
1695: v9fs_post_create(s, vs, err);
1696: }
1697:
1698: static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs,
1699: int err)
1700: {
1701: if (!vs->fidp->dir) {
1702: err = -errno;
1703: }
1704: v9fs_post_create(s, vs, err);
1705: }
1706:
1707: static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs,
1708: int err)
1709: {
1710: if (err) {
1711: err = -errno;
1712: goto out;
1713: }
1714:
1715: vs->fidp->dir = v9fs_do_opendir(s, &vs->fullname);
1716: v9fs_create_post_opendir(s, vs, err);
1717: return;
1718:
1719: out:
1720: v9fs_post_create(s, vs, err);
1721: }
1722:
1723: static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int err)
1724: {
1725: if (err) {
1726: err = -errno;
1727: goto out;
1728: }
1729:
1730: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
1731: v9fs_create_post_dir_lstat(s, vs, err);
1732: return;
1733:
1734: out:
1735: v9fs_post_create(s, vs, err);
1736: }
1737:
1738: static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
1739: {
1740: if (err) {
1741: vs->fidp->fd = -1;
1742: err = -errno;
1743: }
1744:
1745: v9fs_post_create(s, vs, err);
1746: return;
1747: }
1748:
1749: static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err)
1750: {
1751: if (vs->fidp->fd == -1) {
1752: err = -errno;
1753: goto out;
1754: }
1755:
1756: err = v9fs_do_fstat(s, vs->fidp->fd, &vs->stbuf);
1757: v9fs_create_post_fstat(s, vs, err);
1758:
1759: return;
1760:
1761: out:
1762: v9fs_post_create(s, vs, err);
1763:
1764: }
1765:
1766: static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
1767: {
1768:
1769: if (err == 0 || errno != ENOENT) {
1770: err = -errno;
1771: goto out;
1772: }
1773:
1774: if (vs->perm & P9_STAT_MODE_DIR) {
1775: err = v9fs_do_mkdir(s, vs);
1776: v9fs_create_post_mkdir(s, vs, err);
1777: } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
1778: err = v9fs_do_symlink(s, vs);
1779: v9fs_create_post_perms(s, vs, err);
1780: } else if (vs->perm & P9_STAT_MODE_LINK) {
1781: int32_t nfid = atoi(vs->extension.data);
1782: V9fsFidState *nfidp = lookup_fid(s, nfid);
1783: if (nfidp == NULL) {
1784: err = -errno;
1785: v9fs_post_create(s, vs, err);
1786: }
1787: err = v9fs_do_link(s, &nfidp->path, &vs->fullname);
1788: v9fs_create_post_perms(s, vs, err);
1789: } else if (vs->perm & P9_STAT_MODE_DEVICE) {
1790: char ctype;
1791: uint32_t major, minor;
1792: mode_t nmode = 0;
1793:
1794: if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major,
1795: &minor) != 3) {
1796: err = -errno;
1797: v9fs_post_create(s, vs, err);
1798: }
1799:
1800: switch (ctype) {
1801: case 'c':
1802: nmode = S_IFCHR;
1803: break;
1804: case 'b':
1805: nmode = S_IFBLK;
1806: break;
1807: default:
1808: err = -EIO;
1809: v9fs_post_create(s, vs, err);
1810: }
1811:
1812: nmode |= vs->perm & 0777;
1813: err = v9fs_do_mknod(s, vs, nmode, makedev(major, minor));
1814: v9fs_create_post_perms(s, vs, err);
1815: } else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) {
1816: err = v9fs_do_mknod(s, vs, S_IFIFO | (vs->perm & 0777), 0);
1817: v9fs_post_create(s, vs, err);
1818: } else if (vs->perm & P9_STAT_MODE_SOCKET) {
1819: err = v9fs_do_mknod(s, vs, S_IFSOCK | (vs->perm & 0777), 0);
1820: v9fs_post_create(s, vs, err);
1821: } else {
1822: vs->fidp->fd = v9fs_do_open2(s, vs);
1823: v9fs_create_post_open2(s, vs, err);
1824: }
1825:
1826: return;
1827:
1828: out:
1829: v9fs_post_create(s, vs, err);
1830: }
1831:
1832: static void v9fs_create(V9fsState *s, V9fsPDU *pdu)
1833: {
1834: int32_t fid;
1835: V9fsCreateState *vs;
1836: int err = 0;
1837:
1838: vs = qemu_malloc(sizeof(*vs));
1839: vs->pdu = pdu;
1840: vs->offset = 7;
1841:
1842: v9fs_string_init(&vs->fullname);
1843:
1844: pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name,
1845: &vs->perm, &vs->mode, &vs->extension);
1846:
1847: vs->fidp = lookup_fid(s, fid);
1848: if (vs->fidp == NULL) {
1849: err = -EINVAL;
1850: goto out;
1851: }
1852:
1853: v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
1854: vs->name.data);
1855:
1856: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
1857: v9fs_create_post_lstat(s, vs, err);
1858: return;
1859:
1860: out:
1861: complete_pdu(s, vs->pdu, err);
1862: v9fs_string_free(&vs->name);
1863: v9fs_string_free(&vs->extension);
1864: qemu_free(vs);
1865: }
1866:
1867: static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
1868: {
1869: /* A nop call with no return */
1870: complete_pdu(s, pdu, 7);
1871: }
1872:
1873: static void v9fs_remove_post_remove(V9fsState *s, V9fsRemoveState *vs,
1874: int err)
1875: {
1876: /* For TREMOVE we need to clunk the fid even on failed remove */
1877: err = free_fid(s, vs->fidp->fid);
1878: if (err < 0) {
1879: goto out;
1880: }
1881:
1882: err = vs->offset;
1883: out:
1884: complete_pdu(s, vs->pdu, err);
1885: qemu_free(vs);
1886: }
1887:
1888: static void v9fs_remove(V9fsState *s, V9fsPDU *pdu)
1889: {
1890: int32_t fid;
1891: V9fsRemoveState *vs;
1892: int err = 0;
1893:
1894: vs = qemu_malloc(sizeof(*vs));
1895: vs->pdu = pdu;
1896: vs->offset = 7;
1897:
1898: pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
1899:
1900: vs->fidp = lookup_fid(s, fid);
1901: if (vs->fidp == NULL) {
1902: err = -EINVAL;
1903: goto out;
1904: }
1905:
1906: err = v9fs_do_remove(s, &vs->fidp->path);
1907: v9fs_remove_post_remove(s, vs, err);
1908: return;
1909:
1910: out:
1911: complete_pdu(s, pdu, err);
1912: qemu_free(vs);
1913: }
1914:
1915: static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err)
1916: {
1917: if (err < 0) {
1918: goto out;
1919: }
1920:
1921: err = vs->offset;
1922:
1923: out:
1924: v9fs_stat_free(&vs->v9stat);
1925: complete_pdu(s, vs->pdu, err);
1926: qemu_free(vs);
1927: }
1928:
1929: static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err)
1930: {
1931: if (err < 0) {
1932: goto out;
1933: }
1934:
1935: if (vs->v9stat.name.size != 0) {
1936: v9fs_string_free(&vs->nname);
1937: }
1938:
1939: if (vs->v9stat.length != -1) {
1940: if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) {
1941: err = -errno;
1942: }
1943: }
1944: v9fs_wstat_post_truncate(s, vs, err);
1945: return;
1946:
1947: out:
1948: v9fs_stat_free(&vs->v9stat);
1949: complete_pdu(s, vs->pdu, err);
1950: qemu_free(vs);
1951: }
1952:
1953: static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err)
1954: {
1955: V9fsFidState *fidp;
1956: if (err < 0) {
1957: goto out;
1958: }
1959:
1960: if (vs->v9stat.name.size != 0) {
1961: char *old_name, *new_name;
1962: char *end;
1963:
1964: old_name = vs->fidp->path.data;
1965: end = strrchr(old_name, '/');
1966: if (end) {
1967: end++;
1968: } else {
1969: end = old_name;
1970: }
1971:
1972: new_name = qemu_malloc(end - old_name + vs->v9stat.name.size + 1);
1973:
1974: memset(new_name, 0, end - old_name + vs->v9stat.name.size + 1);
1975: memcpy(new_name, old_name, end - old_name);
1976: memcpy(new_name + (end - old_name), vs->v9stat.name.data,
1977: vs->v9stat.name.size);
1978: vs->nname.data = new_name;
1979: vs->nname.size = strlen(new_name);
1980:
1981: if (strcmp(new_name, vs->fidp->path.data) != 0) {
1982: if (v9fs_do_rename(s, &vs->fidp->path, &vs->nname)) {
1983: err = -errno;
1984: } else {
1985: /*
1986: * Fixup fid's pointing to the old name to
1987: * start pointing to the new name
1988: */
1989: for (fidp = s->fid_list; fidp; fidp = fidp->next) {
1990:
1991: if (vs->fidp == fidp) {
1992: /*
1993: * we replace name of this fid towards the end
1994: * so that our below strcmp will work
1995: */
1996: continue;
1997: }
1998: if (!strncmp(vs->fidp->path.data, fidp->path.data,
1999: strlen(vs->fidp->path.data))) {
2000: /* replace the name */
2001: v9fs_fix_path(&fidp->path, &vs->nname,
2002: strlen(vs->fidp->path.data));
2003: }
2004: }
2005: v9fs_string_copy(&vs->fidp->path, &vs->nname);
2006: }
2007: }
2008: }
2009: v9fs_wstat_post_rename(s, vs, err);
2010: return;
2011:
2012: out:
2013: v9fs_stat_free(&vs->v9stat);
2014: complete_pdu(s, vs->pdu, err);
2015: qemu_free(vs);
2016: }
2017:
2018: static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
2019: {
2020: if (err < 0) {
2021: goto out;
2022: }
2023:
2024: if (vs->v9stat.n_gid != -1 || vs->v9stat.n_uid != -1) {
2025: if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
2026: vs->v9stat.n_gid)) {
2027: err = -errno;
2028: }
2029: }
2030: v9fs_wstat_post_chown(s, vs, err);
2031: return;
2032:
2033: out:
2034: v9fs_stat_free(&vs->v9stat);
2035: complete_pdu(s, vs->pdu, err);
2036: qemu_free(vs);
2037: }
2038:
2039: static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err)
2040: {
2041: if (err < 0) {
2042: goto out;
2043: }
2044:
2045: if (vs->v9stat.mtime != -1) {
2046: struct utimbuf tb;
2047: tb.actime = 0;
2048: tb.modtime = vs->v9stat.mtime;
2049: if (v9fs_do_utime(s, &vs->fidp->path, &tb)) {
2050: err = -errno;
2051: }
2052: }
2053:
2054: v9fs_wstat_post_utime(s, vs, err);
2055: return;
2056:
2057: out:
2058: v9fs_stat_free(&vs->v9stat);
2059: complete_pdu(s, vs->pdu, err);
2060: qemu_free(vs);
2061: }
2062:
2063: static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err)
2064: {
2065: if (err == -1) {
2066: err = -errno;
2067: }
2068: v9fs_stat_free(&vs->v9stat);
2069: complete_pdu(s, vs->pdu, err);
2070: qemu_free(vs);
2071: }
2072:
2073: static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err)
2074: {
2075: uint32_t v9_mode;
2076:
2077: if (err == -1) {
2078: err = -errno;
2079: goto out;
2080: }
2081:
2082: v9_mode = stat_to_v9mode(&vs->stbuf);
2083:
2084: if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2085: (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2086: /* Attempting to change the type */
2087: err = -EIO;
2088: goto out;
2089: }
2090:
2091: if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode,
2092: &vs->v9stat.extension))) {
2093: err = -errno;
2094: }
2095: v9fs_wstat_post_chmod(s, vs, err);
2096: return;
2097:
2098: out:
2099: v9fs_stat_free(&vs->v9stat);
2100: complete_pdu(s, vs->pdu, err);
2101: qemu_free(vs);
2102: }
2103:
2104: static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
2105: {
2106: int32_t fid;
2107: V9fsWstatState *vs;
2108: int err = 0;
2109:
2110: vs = qemu_malloc(sizeof(*vs));
2111: vs->pdu = pdu;
2112: vs->offset = 7;
2113:
2114: pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat);
2115:
2116: vs->fidp = lookup_fid(s, fid);
2117: if (vs->fidp == NULL) {
2118: err = -EINVAL;
2119: goto out;
2120: }
2121:
2122: /* do we need to sync the file? */
2123: if (donttouch_stat(&vs->v9stat)) {
2124: err = v9fs_do_fsync(s, vs->fidp->fd);
2125: v9fs_wstat_post_fsync(s, vs, err);
2126: return;
2127: }
2128:
2129: if (vs->v9stat.mode != -1) {
2130: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
2131: v9fs_wstat_post_lstat(s, vs, err);
2132: return;
2133: }
2134:
2135: v9fs_wstat_post_chmod(s, vs, err);
2136: return;
2137:
2138: out:
2139: v9fs_stat_free(&vs->v9stat);
2140: complete_pdu(s, vs->pdu, err);
2141: qemu_free(vs);
2142: }
2143:
2144: typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
2145:
2146: static pdu_handler_t *pdu_handlers[] = {
2147: [P9_TVERSION] = v9fs_version,
2148: [P9_TATTACH] = v9fs_attach,
2149: [P9_TSTAT] = v9fs_stat,
2150: [P9_TWALK] = v9fs_walk,
2151: [P9_TCLUNK] = v9fs_clunk,
2152: [P9_TOPEN] = v9fs_open,
2153: [P9_TREAD] = v9fs_read,
2154: #if 0
2155: [P9_TAUTH] = v9fs_auth,
2156: #endif
2157: [P9_TFLUSH] = v9fs_flush,
2158: [P9_TCREATE] = v9fs_create,
2159: [P9_TWRITE] = v9fs_write,
2160: [P9_TWSTAT] = v9fs_wstat,
2161: [P9_TREMOVE] = v9fs_remove,
2162: };
2163:
2164: static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
2165: {
2166: pdu_handler_t *handler;
2167:
2168: if (debug_9p_pdu) {
2169: pprint_pdu(pdu);
2170: }
2171:
2172: BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers));
2173:
2174: handler = pdu_handlers[pdu->id];
2175: BUG_ON(handler == NULL);
2176:
2177: handler(s, pdu);
2178: }
2179:
2180: static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
2181: {
2182: V9fsState *s = (V9fsState *)vdev;
2183: V9fsPDU *pdu;
2184: ssize_t len;
2185:
2186: while ((pdu = alloc_pdu(s)) &&
2187: (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
2188: uint8_t *ptr;
2189:
2190: BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
2191: BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
2192:
2193: ptr = pdu->elem.out_sg[0].iov_base;
2194:
2195: memcpy(&pdu->size, ptr, 4);
2196: pdu->id = ptr[4];
2197: memcpy(&pdu->tag, ptr + 5, 2);
2198:
2199: submit_pdu(s, pdu);
2200: }
2201:
2202: free_pdu(s, pdu);
2203: }
2204:
2205: static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
2206: {
2207: features |= 1 << VIRTIO_9P_MOUNT_TAG;
2208: return features;
2209: }
2210:
2211: static V9fsState *to_virtio_9p(VirtIODevice *vdev)
2212: {
2213: return (V9fsState *)vdev;
2214: }
2215:
2216: static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
2217: {
2218: struct virtio_9p_config *cfg;
2219: V9fsState *s = to_virtio_9p(vdev);
2220:
2221: cfg = qemu_mallocz(sizeof(struct virtio_9p_config) +
2222: s->tag_len);
2223: stw_raw(&cfg->tag_len, s->tag_len);
2224: memcpy(cfg->tag, s->tag, s->tag_len);
2225: memcpy(config, cfg, s->config_size);
2226: qemu_free(cfg);
2227: }
2228:
2229: VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
2230: {
2231: V9fsState *s;
2232: int i, len;
2233: struct stat stat;
2234: FsTypeEntry *fse;
2235:
2236:
2237: s = (V9fsState *)virtio_common_init("virtio-9p",
2238: VIRTIO_ID_9P,
2239: sizeof(struct virtio_9p_config)+
2240: MAX_TAG_LEN,
2241: sizeof(V9fsState));
2242:
2243: /* initialize pdu allocator */
2244: QLIST_INIT(&s->free_list);
2245: for (i = 0; i < (MAX_REQ - 1); i++) {
2246: QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
2247: }
2248:
2249: s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
2250:
2251: fse = get_fsdev_fsentry(conf->fsdev_id);
2252:
2253: if (!fse) {
2254: /* We don't have a fsdev identified by fsdev_id */
2255: fprintf(stderr, "Virtio-9p device couldn't find fsdev "
2256: "with the id %s\n", conf->fsdev_id);
2257: exit(1);
2258: }
2259:
2260: if (!fse->path || !conf->tag) {
2261: /* we haven't specified a mount_tag or the path */
2262: fprintf(stderr, "fsdev with id %s needs path "
2263: "and Virtio-9p device needs mount_tag arguments\n",
2264: conf->fsdev_id);
2265: exit(1);
2266: }
2267:
2268: if (!strcmp(fse->security_model, "passthrough")) {
2269: /* Files on the Fileserver set to client user credentials */
2270: s->ctx.fs_sm = SM_PASSTHROUGH;
2271: } else if (!strcmp(fse->security_model, "mapped")) {
2272: /* Files on the fileserver are set to QEMU credentials.
2273: * Client user credentials are saved in extended attributes.
2274: */
2275: s->ctx.fs_sm = SM_MAPPED;
2276: } else {
2277: /* user haven't specified a correct security option */
2278: fprintf(stderr, "one of the following must be specified as the"
2279: "security option:\n\t security_model=passthrough \n\t "
2280: "security_model=mapped\n");
2281: return NULL;
2282: }
2283:
2284: if (lstat(fse->path, &stat)) {
2285: fprintf(stderr, "share path %s does not exist\n", fse->path);
2286: exit(1);
2287: } else if (!S_ISDIR(stat.st_mode)) {
2288: fprintf(stderr, "share path %s is not a directory \n", fse->path);
2289: exit(1);
2290: }
2291:
2292: s->ctx.fs_root = qemu_strdup(fse->path);
2293: len = strlen(conf->tag);
2294: if (len > MAX_TAG_LEN) {
2295: len = MAX_TAG_LEN;
2296: }
2297: /* s->tag is non-NULL terminated string */
2298: s->tag = qemu_malloc(len);
2299: memcpy(s->tag, conf->tag, len);
2300: s->tag_len = len;
2301: s->ctx.uid = -1;
2302:
2303: s->ops = fse->ops;
2304: s->vdev.get_features = virtio_9p_get_features;
2305: s->config_size = sizeof(struct virtio_9p_config) +
2306: s->tag_len;
2307: s->vdev.get_config = virtio_9p_get_config;
2308:
2309: return &s->vdev;
2310: }
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