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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 "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-debug.h"
21: #include "virtio-9p-xattr.h"
22:
23: int debug_9p_pdu;
24:
25: enum {
26: Oread = 0x00,
27: Owrite = 0x01,
28: Ordwr = 0x02,
29: Oexec = 0x03,
30: Oexcl = 0x04,
31: Otrunc = 0x10,
32: Orexec = 0x20,
33: Orclose = 0x40,
34: Oappend = 0x80,
35: };
36:
37: static int omode_to_uflags(int8_t mode)
38: {
39: int ret = 0;
40:
41: switch (mode & 3) {
42: case Oread:
43: ret = O_RDONLY;
44: break;
45: case Ordwr:
46: ret = O_RDWR;
47: break;
48: case Owrite:
49: ret = O_WRONLY;
50: break;
51: case Oexec:
52: ret = O_RDONLY;
53: break;
54: }
55:
56: if (mode & Otrunc) {
57: ret |= O_TRUNC;
58: }
59:
60: if (mode & Oappend) {
61: ret |= O_APPEND;
62: }
63:
64: if (mode & Oexcl) {
65: ret |= O_EXCL;
66: }
67:
68: return ret;
69: }
70:
71: void cred_init(FsCred *credp)
72: {
73: credp->fc_uid = -1;
74: credp->fc_gid = -1;
75: credp->fc_mode = -1;
76: credp->fc_rdev = -1;
77: }
78:
79: static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
80: {
81: return s->ops->lstat(&s->ctx, path->data, stbuf);
82: }
83:
84: static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf)
85: {
86: ssize_t len;
87:
88: buf->data = qemu_malloc(1024);
89:
90: len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1);
91: if (len > -1) {
92: buf->size = len;
93: buf->data[len] = 0;
94: }
95:
96: return len;
97: }
98:
99: static int v9fs_do_close(V9fsState *s, int fd)
100: {
101: return s->ops->close(&s->ctx, fd);
102: }
103:
104: static int v9fs_do_closedir(V9fsState *s, DIR *dir)
105: {
106: return s->ops->closedir(&s->ctx, dir);
107: }
108:
109: static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags)
110: {
111: return s->ops->open(&s->ctx, path->data, flags);
112: }
113:
114: static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
115: {
116: return s->ops->opendir(&s->ctx, path->data);
117: }
118:
119: static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
120: {
121: return s->ops->rewinddir(&s->ctx, dir);
122: }
123:
124: static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
125: {
126: return s->ops->telldir(&s->ctx, dir);
127: }
128:
129: static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir)
130: {
131: return s->ops->readdir(&s->ctx, dir);
132: }
133:
134: static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
135: {
136: return s->ops->seekdir(&s->ctx, dir, off);
137: }
138:
139: static int v9fs_do_preadv(V9fsState *s, int fd, const struct iovec *iov,
140: int iovcnt, int64_t offset)
141: {
142: return s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
143: }
144:
145: static int v9fs_do_pwritev(V9fsState *s, int fd, const struct iovec *iov,
146: int iovcnt, int64_t offset)
147: {
148: return s->ops->pwritev(&s->ctx, fd, iov, iovcnt, offset);
149: }
150:
151: static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
152: {
153: FsCred cred;
154: cred_init(&cred);
155: cred.fc_mode = mode;
156: return s->ops->chmod(&s->ctx, path->data, &cred);
157: }
158:
159: static int v9fs_do_mknod(V9fsState *s, char *name,
160: mode_t mode, dev_t dev, uid_t uid, gid_t gid)
161: {
162: FsCred cred;
163: cred_init(&cred);
164: cred.fc_uid = uid;
165: cred.fc_gid = gid;
166: cred.fc_mode = mode;
167: cred.fc_rdev = dev;
168: return s->ops->mknod(&s->ctx, name, &cred);
169: }
170:
171: static int v9fs_do_mkdir(V9fsState *s, char *name, mode_t mode,
172: uid_t uid, gid_t gid)
173: {
174: FsCred cred;
175:
176: cred_init(&cred);
177: cred.fc_uid = uid;
178: cred.fc_gid = gid;
179: cred.fc_mode = mode;
180:
181: return s->ops->mkdir(&s->ctx, name, &cred);
182: }
183:
184: static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
185: {
186: return s->ops->fstat(&s->ctx, fd, stbuf);
187: }
188:
189: static int v9fs_do_open2(V9fsState *s, char *fullname, uid_t uid, gid_t gid,
190: int flags, int mode)
191: {
192: FsCred cred;
193:
194: cred_init(&cred);
195: cred.fc_uid = uid;
196: cred.fc_gid = gid;
197: cred.fc_mode = mode & 07777;
198:
199: return s->ops->open2(&s->ctx, fullname, flags, &cred);
200: }
201:
202: static int v9fs_do_symlink(V9fsState *s, V9fsFidState *fidp,
203: const char *oldpath, const char *newpath, gid_t gid)
204: {
205: FsCred cred;
206: cred_init(&cred);
207: cred.fc_uid = fidp->uid;
208: cred.fc_gid = gid;
209: cred.fc_mode = 0777;
210:
211: return s->ops->symlink(&s->ctx, oldpath, newpath, &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_utimensat(V9fsState *s, V9fsString *path,
241: const struct timespec times[2])
242: {
243: return s->ops->utimensat(&s->ctx, path->data, times);
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, int datasync)
252: {
253: return s->ops->fsync(&s->ctx, fd, datasync);
254: }
255:
256: static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf)
257: {
258: return s->ops->statfs(&s->ctx, path->data, stbuf);
259: }
260:
261: static ssize_t v9fs_do_lgetxattr(V9fsState *s, V9fsString *path,
262: V9fsString *xattr_name,
263: void *value, size_t size)
264: {
265: return s->ops->lgetxattr(&s->ctx, path->data,
266: xattr_name->data, value, size);
267: }
268:
269: static ssize_t v9fs_do_llistxattr(V9fsState *s, V9fsString *path,
270: void *value, size_t size)
271: {
272: return s->ops->llistxattr(&s->ctx, path->data,
273: value, size);
274: }
275:
276: static int v9fs_do_lsetxattr(V9fsState *s, V9fsString *path,
277: V9fsString *xattr_name,
278: void *value, size_t size, int flags)
279: {
280: return s->ops->lsetxattr(&s->ctx, path->data,
281: xattr_name->data, value, size, flags);
282: }
283:
284: static int v9fs_do_lremovexattr(V9fsState *s, V9fsString *path,
285: V9fsString *xattr_name)
286: {
287: return s->ops->lremovexattr(&s->ctx, path->data,
288: xattr_name->data);
289: }
290:
291:
292: static void v9fs_string_init(V9fsString *str)
293: {
294: str->data = NULL;
295: str->size = 0;
296: }
297:
298: static void v9fs_string_free(V9fsString *str)
299: {
300: qemu_free(str->data);
301: str->data = NULL;
302: str->size = 0;
303: }
304:
305: static void v9fs_string_null(V9fsString *str)
306: {
307: v9fs_string_free(str);
308: }
309:
310: static int number_to_string(void *arg, char type)
311: {
312: unsigned int ret = 0;
313:
314: switch (type) {
315: case 'u': {
316: unsigned int num = *(unsigned int *)arg;
317:
318: do {
319: ret++;
320: num = num/10;
321: } while (num);
322: break;
323: }
324: case 'U': {
325: unsigned long num = *(unsigned long *)arg;
326: do {
327: ret++;
328: num = num/10;
329: } while (num);
330: break;
331: }
332: default:
333: printf("Number_to_string: Unknown number format\n");
334: return -1;
335: }
336:
337: return ret;
338: }
339:
340: static int GCC_FMT_ATTR(2, 0)
341: v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap)
342: {
343: va_list ap2;
344: char *iter = (char *)fmt;
345: int len = 0;
346: int nr_args = 0;
347: char *arg_char_ptr;
348: unsigned int arg_uint;
349: unsigned long arg_ulong;
350:
351: /* Find the number of %'s that denotes an argument */
352: for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
353: nr_args++;
354: iter++;
355: }
356:
357: len = strlen(fmt) - 2*nr_args;
358:
359: if (!nr_args) {
360: goto alloc_print;
361: }
362:
363: va_copy(ap2, ap);
364:
365: iter = (char *)fmt;
366:
367: /* Now parse the format string */
368: for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) {
369: iter++;
370: switch (*iter) {
371: case 'u':
372: arg_uint = va_arg(ap2, unsigned int);
373: len += number_to_string((void *)&arg_uint, 'u');
374: break;
375: case 'l':
376: if (*++iter == 'u') {
377: arg_ulong = va_arg(ap2, unsigned long);
378: len += number_to_string((void *)&arg_ulong, 'U');
379: } else {
380: return -1;
381: }
382: break;
383: case 's':
384: arg_char_ptr = va_arg(ap2, char *);
385: len += strlen(arg_char_ptr);
386: break;
387: case 'c':
388: len += 1;
389: break;
390: default:
391: fprintf(stderr,
392: "v9fs_string_alloc_printf:Incorrect format %c", *iter);
393: return -1;
394: }
395: iter++;
396: }
397:
398: alloc_print:
399: *strp = qemu_malloc((len + 1) * sizeof(**strp));
400:
401: return vsprintf(*strp, fmt, ap);
402: }
403:
404: static void GCC_FMT_ATTR(2, 3)
405: v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
406: {
407: va_list ap;
408: int err;
409:
410: v9fs_string_free(str);
411:
412: va_start(ap, fmt);
413: err = v9fs_string_alloc_printf(&str->data, fmt, ap);
414: BUG_ON(err == -1);
415: va_end(ap);
416:
417: str->size = err;
418: }
419:
420: static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
421: {
422: v9fs_string_free(lhs);
423: v9fs_string_sprintf(lhs, "%s", rhs->data);
424: }
425:
426: /*
427: * Return TRUE if s1 is an ancestor of s2.
428: *
429: * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d".
430: * As a special case, We treat s1 as ancestor of s2 if they are same!
431: */
432: static int v9fs_path_is_ancestor(V9fsString *s1, V9fsString *s2)
433: {
434: if (!strncmp(s1->data, s2->data, s1->size)) {
435: if (s2->data[s1->size] == '\0' || s2->data[s1->size] == '/') {
436: return 1;
437: }
438: }
439: return 0;
440: }
441:
442: static size_t v9fs_string_size(V9fsString *str)
443: {
444: return str->size;
445: }
446:
447: static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid)
448: {
449: V9fsFidState *f;
450:
451: for (f = s->fid_list; f; f = f->next) {
452: if (f->fid == fid) {
453: return f;
454: }
455: }
456:
457: return NULL;
458: }
459:
460: static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
461: {
462: V9fsFidState *f;
463:
464: f = lookup_fid(s, fid);
465: if (f) {
466: return NULL;
467: }
468:
469: f = qemu_mallocz(sizeof(V9fsFidState));
470:
471: f->fid = fid;
472: f->fid_type = P9_FID_NONE;
473:
474: f->next = s->fid_list;
475: s->fid_list = f;
476:
477: return f;
478: }
479:
480: static int v9fs_xattr_fid_clunk(V9fsState *s, V9fsFidState *fidp)
481: {
482: int retval = 0;
483:
484: if (fidp->fs.xattr.copied_len == -1) {
485: /* getxattr/listxattr fid */
486: goto free_value;
487: }
488: /*
489: * if this is fid for setxattr. clunk should
490: * result in setxattr localcall
491: */
492: if (fidp->fs.xattr.len != fidp->fs.xattr.copied_len) {
493: /* clunk after partial write */
494: retval = -EINVAL;
495: goto free_out;
496: }
497: if (fidp->fs.xattr.len) {
498: retval = v9fs_do_lsetxattr(s, &fidp->path, &fidp->fs.xattr.name,
499: fidp->fs.xattr.value,
500: fidp->fs.xattr.len,
501: fidp->fs.xattr.flags);
502: } else {
503: retval = v9fs_do_lremovexattr(s, &fidp->path, &fidp->fs.xattr.name);
504: }
505: free_out:
506: v9fs_string_free(&fidp->fs.xattr.name);
507: free_value:
508: if (fidp->fs.xattr.value) {
509: qemu_free(fidp->fs.xattr.value);
510: }
511: return retval;
512: }
513:
514: static int free_fid(V9fsState *s, int32_t fid)
515: {
516: int retval = 0;
517: V9fsFidState **fidpp, *fidp;
518:
519: for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) {
520: if ((*fidpp)->fid == fid) {
521: break;
522: }
523: }
524:
525: if (*fidpp == NULL) {
526: return -ENOENT;
527: }
528:
529: fidp = *fidpp;
530: *fidpp = fidp->next;
531:
532: if (fidp->fid_type == P9_FID_FILE) {
533: v9fs_do_close(s, fidp->fs.fd);
534: } else if (fidp->fid_type == P9_FID_DIR) {
535: v9fs_do_closedir(s, fidp->fs.dir);
536: } else if (fidp->fid_type == P9_FID_XATTR) {
537: retval = v9fs_xattr_fid_clunk(s, fidp);
538: }
539: v9fs_string_free(&fidp->path);
540: qemu_free(fidp);
541:
542: return retval;
543: }
544:
545: #define P9_QID_TYPE_DIR 0x80
546: #define P9_QID_TYPE_SYMLINK 0x02
547:
548: #define P9_STAT_MODE_DIR 0x80000000
549: #define P9_STAT_MODE_APPEND 0x40000000
550: #define P9_STAT_MODE_EXCL 0x20000000
551: #define P9_STAT_MODE_MOUNT 0x10000000
552: #define P9_STAT_MODE_AUTH 0x08000000
553: #define P9_STAT_MODE_TMP 0x04000000
554: #define P9_STAT_MODE_SYMLINK 0x02000000
555: #define P9_STAT_MODE_LINK 0x01000000
556: #define P9_STAT_MODE_DEVICE 0x00800000
557: #define P9_STAT_MODE_NAMED_PIPE 0x00200000
558: #define P9_STAT_MODE_SOCKET 0x00100000
559: #define P9_STAT_MODE_SETUID 0x00080000
560: #define P9_STAT_MODE_SETGID 0x00040000
561: #define P9_STAT_MODE_SETVTX 0x00010000
562:
563: #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \
564: P9_STAT_MODE_SYMLINK | \
565: P9_STAT_MODE_LINK | \
566: P9_STAT_MODE_DEVICE | \
567: P9_STAT_MODE_NAMED_PIPE | \
568: P9_STAT_MODE_SOCKET)
569:
570: /* This is the algorithm from ufs in spfs */
571: static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp)
572: {
573: size_t size;
574:
575: size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path));
576: memcpy(&qidp->path, &stbuf->st_ino, size);
577: qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8);
578: qidp->type = 0;
579: if (S_ISDIR(stbuf->st_mode)) {
580: qidp->type |= P9_QID_TYPE_DIR;
581: }
582: if (S_ISLNK(stbuf->st_mode)) {
583: qidp->type |= P9_QID_TYPE_SYMLINK;
584: }
585: }
586:
587: static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp)
588: {
589: struct stat stbuf;
590: int err;
591:
592: err = v9fs_do_lstat(s, &fidp->path, &stbuf);
593: if (err) {
594: return err;
595: }
596:
597: stat_to_qid(&stbuf, qidp);
598: return 0;
599: }
600:
601: static V9fsPDU *alloc_pdu(V9fsState *s)
602: {
603: V9fsPDU *pdu = NULL;
604:
605: if (!QLIST_EMPTY(&s->free_list)) {
606: pdu = QLIST_FIRST(&s->free_list);
607: QLIST_REMOVE(pdu, next);
608: }
609: return pdu;
610: }
611:
612: static void free_pdu(V9fsState *s, V9fsPDU *pdu)
613: {
614: if (pdu) {
615: if (debug_9p_pdu) {
616: pprint_pdu(pdu);
617: }
618: QLIST_INSERT_HEAD(&s->free_list, pdu, next);
619: }
620: }
621:
622: size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
623: size_t offset, size_t size, int pack)
624: {
625: int i = 0;
626: size_t copied = 0;
627:
628: for (i = 0; size && i < sg_count; i++) {
629: size_t len;
630: if (offset >= sg[i].iov_len) {
631: /* skip this sg */
632: offset -= sg[i].iov_len;
633: continue;
634: } else {
635: len = MIN(sg[i].iov_len - offset, size);
636: if (pack) {
637: memcpy(sg[i].iov_base + offset, addr, len);
638: } else {
639: memcpy(addr, sg[i].iov_base + offset, len);
640: }
641: size -= len;
642: copied += len;
643: addr += len;
644: if (size) {
645: offset = 0;
646: continue;
647: }
648: }
649: }
650:
651: return copied;
652: }
653:
654: static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size)
655: {
656: return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
657: offset, size, 0);
658: }
659:
660: static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src,
661: size_t size)
662: {
663: return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num,
664: offset, size, 1);
665: }
666:
667: static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg)
668: {
669: size_t pos = 0;
670: int i, j;
671: struct iovec *src_sg;
672: unsigned int num;
673:
674: if (rx) {
675: src_sg = pdu->elem.in_sg;
676: num = pdu->elem.in_num;
677: } else {
678: src_sg = pdu->elem.out_sg;
679: num = pdu->elem.out_num;
680: }
681:
682: j = 0;
683: for (i = 0; i < num; i++) {
684: if (offset <= pos) {
685: sg[j].iov_base = src_sg[i].iov_base;
686: sg[j].iov_len = src_sg[i].iov_len;
687: j++;
688: } else if (offset < (src_sg[i].iov_len + pos)) {
689: sg[j].iov_base = src_sg[i].iov_base;
690: sg[j].iov_len = src_sg[i].iov_len;
691: sg[j].iov_base += (offset - pos);
692: sg[j].iov_len -= (offset - pos);
693: j++;
694: }
695: pos += src_sg[i].iov_len;
696: }
697:
698: return j;
699: }
700:
701: static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
702: {
703: size_t old_offset = offset;
704: va_list ap;
705: int i;
706:
707: va_start(ap, fmt);
708: for (i = 0; fmt[i]; i++) {
709: switch (fmt[i]) {
710: case 'b': {
711: uint8_t *valp = va_arg(ap, uint8_t *);
712: offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
713: break;
714: }
715: case 'w': {
716: uint16_t val, *valp;
717: valp = va_arg(ap, uint16_t *);
718: offset += pdu_unpack(&val, pdu, offset, sizeof(val));
719: *valp = le16_to_cpu(val);
720: break;
721: }
722: case 'd': {
723: uint32_t val, *valp;
724: valp = va_arg(ap, uint32_t *);
725: offset += pdu_unpack(&val, pdu, offset, sizeof(val));
726: *valp = le32_to_cpu(val);
727: break;
728: }
729: case 'q': {
730: uint64_t val, *valp;
731: valp = va_arg(ap, uint64_t *);
732: offset += pdu_unpack(&val, pdu, offset, sizeof(val));
733: *valp = le64_to_cpu(val);
734: break;
735: }
736: case 'v': {
737: struct iovec *iov = va_arg(ap, struct iovec *);
738: int *iovcnt = va_arg(ap, int *);
739: *iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
740: break;
741: }
742: case 's': {
743: V9fsString *str = va_arg(ap, V9fsString *);
744: offset += pdu_unmarshal(pdu, offset, "w", &str->size);
745: /* FIXME: sanity check str->size */
746: str->data = qemu_malloc(str->size + 1);
747: offset += pdu_unpack(str->data, pdu, offset, str->size);
748: str->data[str->size] = 0;
749: break;
750: }
751: case 'Q': {
752: V9fsQID *qidp = va_arg(ap, V9fsQID *);
753: offset += pdu_unmarshal(pdu, offset, "bdq",
754: &qidp->type, &qidp->version, &qidp->path);
755: break;
756: }
757: case 'S': {
758: V9fsStat *statp = va_arg(ap, V9fsStat *);
759: offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
760: &statp->size, &statp->type, &statp->dev,
761: &statp->qid, &statp->mode, &statp->atime,
762: &statp->mtime, &statp->length,
763: &statp->name, &statp->uid, &statp->gid,
764: &statp->muid, &statp->extension,
765: &statp->n_uid, &statp->n_gid,
766: &statp->n_muid);
767: break;
768: }
769: case 'I': {
770: V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
771: offset += pdu_unmarshal(pdu, offset, "ddddqqqqq",
772: &iattr->valid, &iattr->mode,
773: &iattr->uid, &iattr->gid, &iattr->size,
774: &iattr->atime_sec, &iattr->atime_nsec,
775: &iattr->mtime_sec, &iattr->mtime_nsec);
776: break;
777: }
778: default:
779: break;
780: }
781: }
782:
783: va_end(ap);
784:
785: return offset - old_offset;
786: }
787:
788: static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
789: {
790: size_t old_offset = offset;
791: va_list ap;
792: int i;
793:
794: va_start(ap, fmt);
795: for (i = 0; fmt[i]; i++) {
796: switch (fmt[i]) {
797: case 'b': {
798: uint8_t val = va_arg(ap, int);
799: offset += pdu_pack(pdu, offset, &val, sizeof(val));
800: break;
801: }
802: case 'w': {
803: uint16_t val;
804: cpu_to_le16w(&val, va_arg(ap, int));
805: offset += pdu_pack(pdu, offset, &val, sizeof(val));
806: break;
807: }
808: case 'd': {
809: uint32_t val;
810: cpu_to_le32w(&val, va_arg(ap, uint32_t));
811: offset += pdu_pack(pdu, offset, &val, sizeof(val));
812: break;
813: }
814: case 'q': {
815: uint64_t val;
816: cpu_to_le64w(&val, va_arg(ap, uint64_t));
817: offset += pdu_pack(pdu, offset, &val, sizeof(val));
818: break;
819: }
820: case 'v': {
821: struct iovec *iov = va_arg(ap, struct iovec *);
822: int *iovcnt = va_arg(ap, int *);
823: *iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
824: break;
825: }
826: case 's': {
827: V9fsString *str = va_arg(ap, V9fsString *);
828: offset += pdu_marshal(pdu, offset, "w", str->size);
829: offset += pdu_pack(pdu, offset, str->data, str->size);
830: break;
831: }
832: case 'Q': {
833: V9fsQID *qidp = va_arg(ap, V9fsQID *);
834: offset += pdu_marshal(pdu, offset, "bdq",
835: qidp->type, qidp->version, qidp->path);
836: break;
837: }
838: case 'S': {
839: V9fsStat *statp = va_arg(ap, V9fsStat *);
840: offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
841: statp->size, statp->type, statp->dev,
842: &statp->qid, statp->mode, statp->atime,
843: statp->mtime, statp->length, &statp->name,
844: &statp->uid, &statp->gid, &statp->muid,
845: &statp->extension, statp->n_uid,
846: statp->n_gid, statp->n_muid);
847: break;
848: }
849: case 'A': {
850: V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
851: offset += pdu_marshal(pdu, offset, "qQdddqqqqqqqqqqqqqqq",
852: statp->st_result_mask,
853: &statp->qid, statp->st_mode,
854: statp->st_uid, statp->st_gid,
855: statp->st_nlink, statp->st_rdev,
856: statp->st_size, statp->st_blksize, statp->st_blocks,
857: statp->st_atime_sec, statp->st_atime_nsec,
858: statp->st_mtime_sec, statp->st_mtime_nsec,
859: statp->st_ctime_sec, statp->st_ctime_nsec,
860: statp->st_btime_sec, statp->st_btime_nsec,
861: statp->st_gen, statp->st_data_version);
862: break;
863: }
864: default:
865: break;
866: }
867: }
868: va_end(ap);
869:
870: return offset - old_offset;
871: }
872:
873: static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len)
874: {
875: int8_t id = pdu->id + 1; /* Response */
876:
877: if (len < 0) {
878: int err = -len;
879: len = 7;
880:
881: if (s->proto_version != V9FS_PROTO_2000L) {
882: V9fsString str;
883:
884: str.data = strerror(err);
885: str.size = strlen(str.data);
886:
887: len += pdu_marshal(pdu, len, "s", &str);
888: id = P9_RERROR;
889: }
890:
891: len += pdu_marshal(pdu, len, "d", err);
892:
893: if (s->proto_version == V9FS_PROTO_2000L) {
894: id = P9_RLERROR;
895: }
896: }
897:
898: /* fill out the header */
899: pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);
900:
901: /* keep these in sync */
902: pdu->size = len;
903: pdu->id = id;
904:
905: /* push onto queue and notify */
906: virtqueue_push(s->vq, &pdu->elem, len);
907:
908: /* FIXME: we should batch these completions */
909: virtio_notify(&s->vdev, s->vq);
910:
911: free_pdu(s, pdu);
912: }
913:
914: static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
915: {
916: mode_t ret;
917:
918: ret = mode & 0777;
919: if (mode & P9_STAT_MODE_DIR) {
920: ret |= S_IFDIR;
921: }
922:
923: if (mode & P9_STAT_MODE_SYMLINK) {
924: ret |= S_IFLNK;
925: }
926: if (mode & P9_STAT_MODE_SOCKET) {
927: ret |= S_IFSOCK;
928: }
929: if (mode & P9_STAT_MODE_NAMED_PIPE) {
930: ret |= S_IFIFO;
931: }
932: if (mode & P9_STAT_MODE_DEVICE) {
933: if (extension && extension->data[0] == 'c') {
934: ret |= S_IFCHR;
935: } else {
936: ret |= S_IFBLK;
937: }
938: }
939:
940: if (!(ret&~0777)) {
941: ret |= S_IFREG;
942: }
943:
944: if (mode & P9_STAT_MODE_SETUID) {
945: ret |= S_ISUID;
946: }
947: if (mode & P9_STAT_MODE_SETGID) {
948: ret |= S_ISGID;
949: }
950: if (mode & P9_STAT_MODE_SETVTX) {
951: ret |= S_ISVTX;
952: }
953:
954: return ret;
955: }
956:
957: static int donttouch_stat(V9fsStat *stat)
958: {
959: if (stat->type == -1 &&
960: stat->dev == -1 &&
961: stat->qid.type == -1 &&
962: stat->qid.version == -1 &&
963: stat->qid.path == -1 &&
964: stat->mode == -1 &&
965: stat->atime == -1 &&
966: stat->mtime == -1 &&
967: stat->length == -1 &&
968: !stat->name.size &&
969: !stat->uid.size &&
970: !stat->gid.size &&
971: !stat->muid.size &&
972: stat->n_uid == -1 &&
973: stat->n_gid == -1 &&
974: stat->n_muid == -1) {
975: return 1;
976: }
977:
978: return 0;
979: }
980:
981: static void v9fs_stat_free(V9fsStat *stat)
982: {
983: v9fs_string_free(&stat->name);
984: v9fs_string_free(&stat->uid);
985: v9fs_string_free(&stat->gid);
986: v9fs_string_free(&stat->muid);
987: v9fs_string_free(&stat->extension);
988: }
989:
990: static uint32_t stat_to_v9mode(const struct stat *stbuf)
991: {
992: uint32_t mode;
993:
994: mode = stbuf->st_mode & 0777;
995: if (S_ISDIR(stbuf->st_mode)) {
996: mode |= P9_STAT_MODE_DIR;
997: }
998:
999: if (S_ISLNK(stbuf->st_mode)) {
1000: mode |= P9_STAT_MODE_SYMLINK;
1001: }
1002:
1003: if (S_ISSOCK(stbuf->st_mode)) {
1004: mode |= P9_STAT_MODE_SOCKET;
1005: }
1006:
1007: if (S_ISFIFO(stbuf->st_mode)) {
1008: mode |= P9_STAT_MODE_NAMED_PIPE;
1009: }
1010:
1011: if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) {
1012: mode |= P9_STAT_MODE_DEVICE;
1013: }
1014:
1015: if (stbuf->st_mode & S_ISUID) {
1016: mode |= P9_STAT_MODE_SETUID;
1017: }
1018:
1019: if (stbuf->st_mode & S_ISGID) {
1020: mode |= P9_STAT_MODE_SETGID;
1021: }
1022:
1023: if (stbuf->st_mode & S_ISVTX) {
1024: mode |= P9_STAT_MODE_SETVTX;
1025: }
1026:
1027: return mode;
1028: }
1029:
1030: static int stat_to_v9stat(V9fsState *s, V9fsString *name,
1031: const struct stat *stbuf,
1032: V9fsStat *v9stat)
1033: {
1034: int err;
1035: const char *str;
1036:
1037: memset(v9stat, 0, sizeof(*v9stat));
1038:
1039: stat_to_qid(stbuf, &v9stat->qid);
1040: v9stat->mode = stat_to_v9mode(stbuf);
1041: v9stat->atime = stbuf->st_atime;
1042: v9stat->mtime = stbuf->st_mtime;
1043: v9stat->length = stbuf->st_size;
1044:
1045: v9fs_string_null(&v9stat->uid);
1046: v9fs_string_null(&v9stat->gid);
1047: v9fs_string_null(&v9stat->muid);
1048:
1049: v9stat->n_uid = stbuf->st_uid;
1050: v9stat->n_gid = stbuf->st_gid;
1051: v9stat->n_muid = 0;
1052:
1053: v9fs_string_null(&v9stat->extension);
1054:
1055: if (v9stat->mode & P9_STAT_MODE_SYMLINK) {
1056: err = v9fs_do_readlink(s, name, &v9stat->extension);
1057: if (err == -1) {
1058: err = -errno;
1059: return err;
1060: }
1061: v9stat->extension.data[err] = 0;
1062: v9stat->extension.size = err;
1063: } else if (v9stat->mode & P9_STAT_MODE_DEVICE) {
1064: v9fs_string_sprintf(&v9stat->extension, "%c %u %u",
1065: S_ISCHR(stbuf->st_mode) ? 'c' : 'b',
1066: major(stbuf->st_rdev), minor(stbuf->st_rdev));
1067: } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) {
1068: v9fs_string_sprintf(&v9stat->extension, "%s %lu",
1069: "HARDLINKCOUNT", (unsigned long)stbuf->st_nlink);
1070: }
1071:
1072: str = strrchr(name->data, '/');
1073: if (str) {
1074: str += 1;
1075: } else {
1076: str = name->data;
1077: }
1078:
1079: v9fs_string_sprintf(&v9stat->name, "%s", str);
1080:
1081: v9stat->size = 61 +
1082: v9fs_string_size(&v9stat->name) +
1083: v9fs_string_size(&v9stat->uid) +
1084: v9fs_string_size(&v9stat->gid) +
1085: v9fs_string_size(&v9stat->muid) +
1086: v9fs_string_size(&v9stat->extension);
1087: return 0;
1088: }
1089:
1090: #define P9_STATS_MODE 0x00000001ULL
1091: #define P9_STATS_NLINK 0x00000002ULL
1092: #define P9_STATS_UID 0x00000004ULL
1093: #define P9_STATS_GID 0x00000008ULL
1094: #define P9_STATS_RDEV 0x00000010ULL
1095: #define P9_STATS_ATIME 0x00000020ULL
1096: #define P9_STATS_MTIME 0x00000040ULL
1097: #define P9_STATS_CTIME 0x00000080ULL
1098: #define P9_STATS_INO 0x00000100ULL
1099: #define P9_STATS_SIZE 0x00000200ULL
1100: #define P9_STATS_BLOCKS 0x00000400ULL
1101:
1102: #define P9_STATS_BTIME 0x00000800ULL
1103: #define P9_STATS_GEN 0x00001000ULL
1104: #define P9_STATS_DATA_VERSION 0x00002000ULL
1105:
1106: #define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
1107: #define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
1108:
1109:
1110: static void stat_to_v9stat_dotl(V9fsState *s, const struct stat *stbuf,
1111: V9fsStatDotl *v9lstat)
1112: {
1113: memset(v9lstat, 0, sizeof(*v9lstat));
1114:
1115: v9lstat->st_mode = stbuf->st_mode;
1116: v9lstat->st_nlink = stbuf->st_nlink;
1117: v9lstat->st_uid = stbuf->st_uid;
1118: v9lstat->st_gid = stbuf->st_gid;
1119: v9lstat->st_rdev = stbuf->st_rdev;
1120: v9lstat->st_size = stbuf->st_size;
1121: v9lstat->st_blksize = stbuf->st_blksize;
1122: v9lstat->st_blocks = stbuf->st_blocks;
1123: v9lstat->st_atime_sec = stbuf->st_atime;
1124: v9lstat->st_atime_nsec = stbuf->st_atim.tv_nsec;
1125: v9lstat->st_mtime_sec = stbuf->st_mtime;
1126: v9lstat->st_mtime_nsec = stbuf->st_mtim.tv_nsec;
1127: v9lstat->st_ctime_sec = stbuf->st_ctime;
1128: v9lstat->st_ctime_nsec = stbuf->st_ctim.tv_nsec;
1129: /* Currently we only support BASIC fields in stat */
1130: v9lstat->st_result_mask = P9_STATS_BASIC;
1131:
1132: stat_to_qid(stbuf, &v9lstat->qid);
1133: }
1134:
1135: static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt)
1136: {
1137: while (len && *iovcnt) {
1138: if (len < sg->iov_len) {
1139: sg->iov_len -= len;
1140: sg->iov_base += len;
1141: len = 0;
1142: } else {
1143: len -= sg->iov_len;
1144: sg++;
1145: *iovcnt -= 1;
1146: }
1147: }
1148:
1149: return sg;
1150: }
1151:
1152: static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt)
1153: {
1154: int i;
1155: int total = 0;
1156:
1157: for (i = 0; i < *cnt; i++) {
1158: if ((total + sg[i].iov_len) > cap) {
1159: sg[i].iov_len -= ((total + sg[i].iov_len) - cap);
1160: i++;
1161: break;
1162: }
1163: total += sg[i].iov_len;
1164: }
1165:
1166: *cnt = i;
1167:
1168: return sg;
1169: }
1170:
1171: static void print_sg(struct iovec *sg, int cnt)
1172: {
1173: int i;
1174:
1175: printf("sg[%d]: {", cnt);
1176: for (i = 0; i < cnt; i++) {
1177: if (i) {
1178: printf(", ");
1179: }
1180: printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len);
1181: }
1182: printf("}\n");
1183: }
1184:
1185: static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
1186: {
1187: V9fsString str;
1188: v9fs_string_init(&str);
1189: v9fs_string_copy(&str, dst);
1190: v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
1191: v9fs_string_free(&str);
1192: }
1193:
1194: static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
1195: {
1196: V9fsString version;
1197: size_t offset = 7;
1198:
1199: pdu_unmarshal(pdu, offset, "ds", &s->msize, &version);
1200:
1201: if (!strcmp(version.data, "9P2000.u")) {
1202: s->proto_version = V9FS_PROTO_2000U;
1203: } else if (!strcmp(version.data, "9P2000.L")) {
1204: s->proto_version = V9FS_PROTO_2000L;
1205: } else {
1206: v9fs_string_sprintf(&version, "unknown");
1207: }
1208:
1209: offset += pdu_marshal(pdu, offset, "ds", s->msize, &version);
1210: complete_pdu(s, pdu, offset);
1211:
1212: v9fs_string_free(&version);
1213: }
1214:
1215: static void v9fs_attach(V9fsState *s, V9fsPDU *pdu)
1216: {
1217: int32_t fid, afid, n_uname;
1218: V9fsString uname, aname;
1219: V9fsFidState *fidp;
1220: V9fsQID qid;
1221: size_t offset = 7;
1222: ssize_t err;
1223:
1224: pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname);
1225:
1226: fidp = alloc_fid(s, fid);
1227: if (fidp == NULL) {
1228: err = -EINVAL;
1229: goto out;
1230: }
1231:
1232: fidp->uid = n_uname;
1233:
1234: v9fs_string_sprintf(&fidp->path, "%s", "/");
1235: err = fid_to_qid(s, fidp, &qid);
1236: if (err) {
1237: err = -EINVAL;
1238: free_fid(s, fid);
1239: goto out;
1240: }
1241:
1242: offset += pdu_marshal(pdu, offset, "Q", &qid);
1243:
1244: err = offset;
1245: out:
1246: complete_pdu(s, pdu, err);
1247: v9fs_string_free(&uname);
1248: v9fs_string_free(&aname);
1249: }
1250:
1251: static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err)
1252: {
1253: if (err == -1) {
1254: err = -errno;
1255: goto out;
1256: }
1257:
1258: err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat);
1259: if (err) {
1260: goto out;
1261: }
1262: vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat);
1263: err = vs->offset;
1264:
1265: out:
1266: complete_pdu(s, vs->pdu, err);
1267: v9fs_stat_free(&vs->v9stat);
1268: qemu_free(vs);
1269: }
1270:
1271: static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
1272: {
1273: int32_t fid;
1274: V9fsStatState *vs;
1275: ssize_t err = 0;
1276:
1277: vs = qemu_malloc(sizeof(*vs));
1278: vs->pdu = pdu;
1279: vs->offset = 7;
1280:
1281: memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1282:
1283: pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
1284:
1285: vs->fidp = lookup_fid(s, fid);
1286: if (vs->fidp == NULL) {
1287: err = -ENOENT;
1288: goto out;
1289: }
1290:
1291: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1292: v9fs_stat_post_lstat(s, vs, err);
1293: return;
1294:
1295: out:
1296: complete_pdu(s, vs->pdu, err);
1297: v9fs_stat_free(&vs->v9stat);
1298: qemu_free(vs);
1299: }
1300:
1301: static void v9fs_getattr_post_lstat(V9fsState *s, V9fsStatStateDotl *vs,
1302: int err)
1303: {
1304: if (err == -1) {
1305: err = -errno;
1306: goto out;
1307: }
1308:
1309: stat_to_v9stat_dotl(s, &vs->stbuf, &vs->v9stat_dotl);
1310: vs->offset += pdu_marshal(vs->pdu, vs->offset, "A", &vs->v9stat_dotl);
1311: err = vs->offset;
1312:
1313: out:
1314: complete_pdu(s, vs->pdu, err);
1315: qemu_free(vs);
1316: }
1317:
1318: static void v9fs_getattr(V9fsState *s, V9fsPDU *pdu)
1319: {
1320: int32_t fid;
1321: V9fsStatStateDotl *vs;
1322: ssize_t err = 0;
1323: V9fsFidState *fidp;
1324: uint64_t request_mask;
1325:
1326: vs = qemu_malloc(sizeof(*vs));
1327: vs->pdu = pdu;
1328: vs->offset = 7;
1329:
1330: memset(&vs->v9stat_dotl, 0, sizeof(vs->v9stat_dotl));
1331:
1332: pdu_unmarshal(vs->pdu, vs->offset, "dq", &fid, &request_mask);
1333:
1334: fidp = lookup_fid(s, fid);
1335: if (fidp == NULL) {
1336: err = -ENOENT;
1337: goto out;
1338: }
1339:
1340: /* Currently we only support BASIC fields in stat, so there is no
1341: * need to look at request_mask.
1342: */
1343: err = v9fs_do_lstat(s, &fidp->path, &vs->stbuf);
1344: v9fs_getattr_post_lstat(s, vs, err);
1345: return;
1346:
1347: out:
1348: complete_pdu(s, vs->pdu, err);
1349: qemu_free(vs);
1350: }
1351:
1352: /* From Linux kernel code */
1353: #define ATTR_MODE (1 << 0)
1354: #define ATTR_UID (1 << 1)
1355: #define ATTR_GID (1 << 2)
1356: #define ATTR_SIZE (1 << 3)
1357: #define ATTR_ATIME (1 << 4)
1358: #define ATTR_MTIME (1 << 5)
1359: #define ATTR_CTIME (1 << 6)
1360: #define ATTR_MASK 127
1361: #define ATTR_ATIME_SET (1 << 7)
1362: #define ATTR_MTIME_SET (1 << 8)
1363:
1364: static void v9fs_setattr_post_truncate(V9fsState *s, V9fsSetattrState *vs,
1365: int err)
1366: {
1367: if (err == -1) {
1368: err = -errno;
1369: goto out;
1370: }
1371: err = vs->offset;
1372:
1373: out:
1374: complete_pdu(s, vs->pdu, err);
1375: qemu_free(vs);
1376: }
1377:
1378: static void v9fs_setattr_post_chown(V9fsState *s, V9fsSetattrState *vs, int err)
1379: {
1380: if (err == -1) {
1381: err = -errno;
1382: goto out;
1383: }
1384:
1385: if (vs->v9iattr.valid & (ATTR_SIZE)) {
1386: err = v9fs_do_truncate(s, &vs->fidp->path, vs->v9iattr.size);
1387: }
1388: v9fs_setattr_post_truncate(s, vs, err);
1389: return;
1390:
1391: out:
1392: complete_pdu(s, vs->pdu, err);
1393: qemu_free(vs);
1394: }
1395:
1396: static void v9fs_setattr_post_utimensat(V9fsState *s, V9fsSetattrState *vs,
1397: int err)
1398: {
1399: if (err == -1) {
1400: err = -errno;
1401: goto out;
1402: }
1403:
1404: /* If the only valid entry in iattr is ctime we can call
1405: * chown(-1,-1) to update the ctime of the file
1406: */
1407: if ((vs->v9iattr.valid & (ATTR_UID | ATTR_GID)) ||
1408: ((vs->v9iattr.valid & ATTR_CTIME)
1409: && !((vs->v9iattr.valid & ATTR_MASK) & ~ATTR_CTIME))) {
1410: if (!(vs->v9iattr.valid & ATTR_UID)) {
1411: vs->v9iattr.uid = -1;
1412: }
1413: if (!(vs->v9iattr.valid & ATTR_GID)) {
1414: vs->v9iattr.gid = -1;
1415: }
1416: err = v9fs_do_chown(s, &vs->fidp->path, vs->v9iattr.uid,
1417: vs->v9iattr.gid);
1418: }
1419: v9fs_setattr_post_chown(s, vs, err);
1420: return;
1421:
1422: out:
1423: complete_pdu(s, vs->pdu, err);
1424: qemu_free(vs);
1425: }
1426:
1427: static void v9fs_setattr_post_chmod(V9fsState *s, V9fsSetattrState *vs, int err)
1428: {
1429: if (err == -1) {
1430: err = -errno;
1431: goto out;
1432: }
1433:
1434: if (vs->v9iattr.valid & (ATTR_ATIME | ATTR_MTIME)) {
1435: struct timespec times[2];
1436: if (vs->v9iattr.valid & ATTR_ATIME) {
1437: if (vs->v9iattr.valid & ATTR_ATIME_SET) {
1438: times[0].tv_sec = vs->v9iattr.atime_sec;
1439: times[0].tv_nsec = vs->v9iattr.atime_nsec;
1440: } else {
1441: times[0].tv_nsec = UTIME_NOW;
1442: }
1443: } else {
1444: times[0].tv_nsec = UTIME_OMIT;
1445: }
1446:
1447: if (vs->v9iattr.valid & ATTR_MTIME) {
1448: if (vs->v9iattr.valid & ATTR_MTIME_SET) {
1449: times[1].tv_sec = vs->v9iattr.mtime_sec;
1450: times[1].tv_nsec = vs->v9iattr.mtime_nsec;
1451: } else {
1452: times[1].tv_nsec = UTIME_NOW;
1453: }
1454: } else {
1455: times[1].tv_nsec = UTIME_OMIT;
1456: }
1457: err = v9fs_do_utimensat(s, &vs->fidp->path, times);
1458: }
1459: v9fs_setattr_post_utimensat(s, vs, err);
1460: return;
1461:
1462: out:
1463: complete_pdu(s, vs->pdu, err);
1464: qemu_free(vs);
1465: }
1466:
1467: static void v9fs_setattr(V9fsState *s, V9fsPDU *pdu)
1468: {
1469: int32_t fid;
1470: V9fsSetattrState *vs;
1471: int err = 0;
1472:
1473: vs = qemu_malloc(sizeof(*vs));
1474: vs->pdu = pdu;
1475: vs->offset = 7;
1476:
1477: pdu_unmarshal(pdu, vs->offset, "dI", &fid, &vs->v9iattr);
1478:
1479: vs->fidp = lookup_fid(s, fid);
1480: if (vs->fidp == NULL) {
1481: err = -EINVAL;
1482: goto out;
1483: }
1484:
1485: if (vs->v9iattr.valid & ATTR_MODE) {
1486: err = v9fs_do_chmod(s, &vs->fidp->path, vs->v9iattr.mode);
1487: }
1488:
1489: v9fs_setattr_post_chmod(s, vs, err);
1490: return;
1491:
1492: out:
1493: complete_pdu(s, vs->pdu, err);
1494: qemu_free(vs);
1495: }
1496:
1497: static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err)
1498: {
1499: complete_pdu(s, vs->pdu, err);
1500:
1501: if (vs->nwnames && vs->nwnames <= P9_MAXWELEM) {
1502: for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) {
1503: v9fs_string_free(&vs->wnames[vs->name_idx]);
1504: }
1505:
1506: qemu_free(vs->wnames);
1507: qemu_free(vs->qids);
1508: }
1509: }
1510:
1511: static void v9fs_walk_marshal(V9fsWalkState *vs)
1512: {
1513: int i;
1514: vs->offset = 7;
1515: vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames);
1516:
1517: for (i = 0; i < vs->nwnames; i++) {
1518: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]);
1519: }
1520: }
1521:
1522: static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs,
1523: int err)
1524: {
1525: if (err == -1) {
1526: free_fid(s, vs->newfidp->fid);
1527: v9fs_string_free(&vs->path);
1528: err = -ENOENT;
1529: goto out;
1530: }
1531:
1532: stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1533:
1534: vs->name_idx++;
1535: if (vs->name_idx < vs->nwnames) {
1536: v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1537: vs->wnames[vs->name_idx].data);
1538: v9fs_string_copy(&vs->newfidp->path, &vs->path);
1539:
1540: err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1541: v9fs_walk_post_newfid_lstat(s, vs, err);
1542: return;
1543: }
1544:
1545: v9fs_string_free(&vs->path);
1546: v9fs_walk_marshal(vs);
1547: err = vs->offset;
1548: out:
1549: v9fs_walk_complete(s, vs, err);
1550: }
1551:
1552: static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs,
1553: int err)
1554: {
1555: if (err == -1) {
1556: v9fs_string_free(&vs->path);
1557: err = -ENOENT;
1558: goto out;
1559: }
1560:
1561: stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]);
1562: vs->name_idx++;
1563: if (vs->name_idx < vs->nwnames) {
1564:
1565: v9fs_string_sprintf(&vs->path, "%s/%s",
1566: vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1567: v9fs_string_copy(&vs->fidp->path, &vs->path);
1568:
1569: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1570: v9fs_walk_post_oldfid_lstat(s, vs, err);
1571: return;
1572: }
1573:
1574: v9fs_string_free(&vs->path);
1575: v9fs_walk_marshal(vs);
1576: err = vs->offset;
1577: out:
1578: v9fs_walk_complete(s, vs, err);
1579: }
1580:
1581: static void v9fs_walk(V9fsState *s, V9fsPDU *pdu)
1582: {
1583: int32_t fid, newfid;
1584: V9fsWalkState *vs;
1585: int err = 0;
1586: int i;
1587:
1588: vs = qemu_malloc(sizeof(*vs));
1589: vs->pdu = pdu;
1590: vs->wnames = NULL;
1591: vs->qids = NULL;
1592: vs->offset = 7;
1593:
1594: vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid,
1595: &newfid, &vs->nwnames);
1596:
1597: if (vs->nwnames && vs->nwnames <= P9_MAXWELEM) {
1598: vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames);
1599:
1600: vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames);
1601:
1602: for (i = 0; i < vs->nwnames; i++) {
1603: vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s",
1604: &vs->wnames[i]);
1605: }
1606: } else if (vs->nwnames > P9_MAXWELEM) {
1607: err = -EINVAL;
1608: goto out;
1609: }
1610:
1611: vs->fidp = lookup_fid(s, fid);
1612: if (vs->fidp == NULL) {
1613: err = -ENOENT;
1614: goto out;
1615: }
1616:
1617: /* FIXME: is this really valid? */
1618: if (fid == newfid) {
1619:
1620: BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
1621: v9fs_string_init(&vs->path);
1622: vs->name_idx = 0;
1623:
1624: if (vs->name_idx < vs->nwnames) {
1625: v9fs_string_sprintf(&vs->path, "%s/%s",
1626: vs->fidp->path.data, vs->wnames[vs->name_idx].data);
1627: v9fs_string_copy(&vs->fidp->path, &vs->path);
1628:
1629: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1630: v9fs_walk_post_oldfid_lstat(s, vs, err);
1631: return;
1632: }
1633: } else {
1634: vs->newfidp = alloc_fid(s, newfid);
1635: if (vs->newfidp == NULL) {
1636: err = -EINVAL;
1637: goto out;
1638: }
1639:
1640: vs->newfidp->uid = vs->fidp->uid;
1641: v9fs_string_init(&vs->path);
1642: vs->name_idx = 0;
1643: v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path);
1644:
1645: if (vs->name_idx < vs->nwnames) {
1646: v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data,
1647: vs->wnames[vs->name_idx].data);
1648: v9fs_string_copy(&vs->newfidp->path, &vs->path);
1649:
1650: err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf);
1651: v9fs_walk_post_newfid_lstat(s, vs, err);
1652: return;
1653: }
1654: }
1655:
1656: v9fs_walk_marshal(vs);
1657: err = vs->offset;
1658: out:
1659: v9fs_walk_complete(s, vs, err);
1660: }
1661:
1662: static int32_t get_iounit(V9fsState *s, V9fsString *name)
1663: {
1664: struct statfs stbuf;
1665: int32_t iounit = 0;
1666:
1667: /*
1668: * iounit should be multiples of f_bsize (host filesystem block size
1669: * and as well as less than (client msize - P9_IOHDRSZ))
1670: */
1671: if (!v9fs_do_statfs(s, name, &stbuf)) {
1672: iounit = stbuf.f_bsize;
1673: iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
1674: }
1675:
1676: if (!iounit) {
1677: iounit = s->msize - P9_IOHDRSZ;
1678: }
1679: return iounit;
1680: }
1681:
1682: static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err)
1683: {
1684: if (vs->fidp->fs.dir == NULL) {
1685: err = -errno;
1686: goto out;
1687: }
1688: vs->fidp->fid_type = P9_FID_DIR;
1689: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
1690: err = vs->offset;
1691: out:
1692: complete_pdu(s, vs->pdu, err);
1693: qemu_free(vs);
1694:
1695: }
1696:
1697: static void v9fs_open_post_getiounit(V9fsState *s, V9fsOpenState *vs)
1698: {
1699: int err;
1700: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
1701: err = vs->offset;
1702: complete_pdu(s, vs->pdu, err);
1703: qemu_free(vs);
1704: }
1705:
1706: static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err)
1707: {
1708: if (vs->fidp->fs.fd == -1) {
1709: err = -errno;
1710: goto out;
1711: }
1712: vs->fidp->fid_type = P9_FID_FILE;
1713: vs->iounit = get_iounit(s, &vs->fidp->path);
1714: v9fs_open_post_getiounit(s, vs);
1715: return;
1716: out:
1717: complete_pdu(s, vs->pdu, err);
1718: qemu_free(vs);
1719: }
1720:
1721: static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err)
1722: {
1723: int flags;
1724:
1725: if (err) {
1726: err = -errno;
1727: goto out;
1728: }
1729:
1730: stat_to_qid(&vs->stbuf, &vs->qid);
1731:
1732: if (S_ISDIR(vs->stbuf.st_mode)) {
1733: vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fidp->path);
1734: v9fs_open_post_opendir(s, vs, err);
1735: } else {
1736: if (s->proto_version == V9FS_PROTO_2000L) {
1737: flags = vs->mode;
1738: flags &= ~(O_NOCTTY | O_ASYNC | O_CREAT);
1739: /* Ignore direct disk access hint until the server supports it. */
1740: flags &= ~O_DIRECT;
1741: } else {
1742: flags = omode_to_uflags(vs->mode);
1743: }
1744: vs->fidp->fs.fd = v9fs_do_open(s, &vs->fidp->path, flags);
1745: v9fs_open_post_open(s, vs, err);
1746: }
1747: return;
1748: out:
1749: complete_pdu(s, vs->pdu, err);
1750: qemu_free(vs);
1751: }
1752:
1753: static void v9fs_open(V9fsState *s, V9fsPDU *pdu)
1754: {
1755: int32_t fid;
1756: V9fsOpenState *vs;
1757: ssize_t err = 0;
1758:
1759: vs = qemu_malloc(sizeof(*vs));
1760: vs->pdu = pdu;
1761: vs->offset = 7;
1762: vs->mode = 0;
1763:
1764: if (s->proto_version == V9FS_PROTO_2000L) {
1765: pdu_unmarshal(vs->pdu, vs->offset, "dd", &fid, &vs->mode);
1766: } else {
1767: pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode);
1768: }
1769:
1770: vs->fidp = lookup_fid(s, fid);
1771: if (vs->fidp == NULL) {
1772: err = -ENOENT;
1773: goto out;
1774: }
1775:
1776: BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
1777:
1778: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
1779:
1780: v9fs_open_post_lstat(s, vs, err);
1781: return;
1782: out:
1783: complete_pdu(s, pdu, err);
1784: qemu_free(vs);
1785: }
1786:
1787: static void v9fs_post_lcreate(V9fsState *s, V9fsLcreateState *vs, int err)
1788: {
1789: if (err == 0) {
1790: v9fs_string_copy(&vs->fidp->path, &vs->fullname);
1791: stat_to_qid(&vs->stbuf, &vs->qid);
1792: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid,
1793: vs->iounit);
1794: err = vs->offset;
1795: } else {
1796: vs->fidp->fid_type = P9_FID_NONE;
1797: err = -errno;
1798: if (vs->fidp->fs.fd > 0) {
1799: close(vs->fidp->fs.fd);
1800: }
1801: }
1802:
1803: complete_pdu(s, vs->pdu, err);
1804: v9fs_string_free(&vs->name);
1805: v9fs_string_free(&vs->fullname);
1806: qemu_free(vs);
1807: }
1808:
1809: static void v9fs_lcreate_post_get_iounit(V9fsState *s, V9fsLcreateState *vs,
1810: int err)
1811: {
1812: if (err) {
1813: err = -errno;
1814: goto out;
1815: }
1816: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
1817:
1818: out:
1819: v9fs_post_lcreate(s, vs, err);
1820: }
1821:
1822: static void v9fs_lcreate_post_do_open2(V9fsState *s, V9fsLcreateState *vs,
1823: int err)
1824: {
1825: if (vs->fidp->fs.fd == -1) {
1826: err = -errno;
1827: goto out;
1828: }
1829: vs->fidp->fid_type = P9_FID_FILE;
1830: vs->iounit = get_iounit(s, &vs->fullname);
1831: v9fs_lcreate_post_get_iounit(s, vs, err);
1832: return;
1833:
1834: out:
1835: v9fs_post_lcreate(s, vs, err);
1836: }
1837:
1838: static void v9fs_lcreate(V9fsState *s, V9fsPDU *pdu)
1839: {
1840: int32_t dfid, flags, mode;
1841: gid_t gid;
1842: V9fsLcreateState *vs;
1843: ssize_t err = 0;
1844:
1845: vs = qemu_malloc(sizeof(*vs));
1846: vs->pdu = pdu;
1847: vs->offset = 7;
1848:
1849: v9fs_string_init(&vs->fullname);
1850:
1851: pdu_unmarshal(vs->pdu, vs->offset, "dsddd", &dfid, &vs->name, &flags,
1852: &mode, &gid);
1853:
1854: vs->fidp = lookup_fid(s, dfid);
1855: if (vs->fidp == NULL) {
1856: err = -ENOENT;
1857: goto out;
1858: }
1859:
1860: v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
1861: vs->name.data);
1862:
1863: /* Ignore direct disk access hint until the server supports it. */
1864: flags &= ~O_DIRECT;
1865:
1866: vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
1867: gid, flags, mode);
1868: v9fs_lcreate_post_do_open2(s, vs, err);
1869: return;
1870:
1871: out:
1872: complete_pdu(s, vs->pdu, err);
1873: v9fs_string_free(&vs->name);
1874: qemu_free(vs);
1875: }
1876:
1877: static void v9fs_post_do_fsync(V9fsState *s, V9fsPDU *pdu, int err)
1878: {
1879: if (err == -1) {
1880: err = -errno;
1881: }
1882: complete_pdu(s, pdu, err);
1883: }
1884:
1885: static void v9fs_fsync(V9fsState *s, V9fsPDU *pdu)
1886: {
1887: int32_t fid;
1888: size_t offset = 7;
1889: V9fsFidState *fidp;
1890: int datasync;
1891: int err;
1892:
1893: pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
1894: fidp = lookup_fid(s, fid);
1895: if (fidp == NULL) {
1896: err = -ENOENT;
1897: v9fs_post_do_fsync(s, pdu, err);
1898: return;
1899: }
1900: err = v9fs_do_fsync(s, fidp->fs.fd, datasync);
1901: v9fs_post_do_fsync(s, pdu, err);
1902: }
1903:
1904: static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
1905: {
1906: int32_t fid;
1907: size_t offset = 7;
1908: int err;
1909:
1910: pdu_unmarshal(pdu, offset, "d", &fid);
1911:
1912: err = free_fid(s, fid);
1913: if (err < 0) {
1914: goto out;
1915: }
1916:
1917: offset = 7;
1918: err = offset;
1919: out:
1920: complete_pdu(s, pdu, err);
1921: }
1922:
1923: static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
1924:
1925: static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1926: {
1927: if (err) {
1928: goto out;
1929: }
1930: v9fs_stat_free(&vs->v9stat);
1931: v9fs_string_free(&vs->name);
1932: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1933: vs->offset += vs->count;
1934: err = vs->offset;
1935: out:
1936: complete_pdu(s, vs->pdu, err);
1937: qemu_free(vs);
1938: return;
1939: }
1940:
1941: static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
1942: ssize_t err)
1943: {
1944: if (err) {
1945: err = -errno;
1946: goto out;
1947: }
1948: err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
1949: if (err) {
1950: goto out;
1951: }
1952:
1953: vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
1954: &vs->v9stat);
1955: if ((vs->len != (vs->v9stat.size + 2)) ||
1956: ((vs->count + vs->len) > vs->max_count)) {
1957: v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
1958: v9fs_read_post_seekdir(s, vs, err);
1959: return;
1960: }
1961: vs->count += vs->len;
1962: v9fs_stat_free(&vs->v9stat);
1963: v9fs_string_free(&vs->name);
1964: vs->dir_pos = vs->dent->d_off;
1965: vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
1966: v9fs_read_post_readdir(s, vs, err);
1967: return;
1968: out:
1969: v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
1970: v9fs_read_post_seekdir(s, vs, err);
1971: return;
1972:
1973: }
1974:
1975: static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1976: {
1977: if (vs->dent) {
1978: memset(&vs->v9stat, 0, sizeof(vs->v9stat));
1979: v9fs_string_init(&vs->name);
1980: v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
1981: vs->dent->d_name);
1982: err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
1983: v9fs_read_post_dir_lstat(s, vs, err);
1984: return;
1985: }
1986:
1987: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
1988: vs->offset += vs->count;
1989: err = vs->offset;
1990: complete_pdu(s, vs->pdu, err);
1991: qemu_free(vs);
1992: return;
1993: }
1994:
1995: static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
1996: {
1997: vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
1998: v9fs_read_post_readdir(s, vs, err);
1999: return;
2000: }
2001:
2002: static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
2003: ssize_t err)
2004: {
2005: vs->dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
2006: v9fs_read_post_telldir(s, vs, err);
2007: return;
2008: }
2009:
2010: static void v9fs_read_post_preadv(V9fsState *s, V9fsReadState *vs, ssize_t err)
2011: {
2012: if (err < 0) {
2013: /* IO error return the error */
2014: err = -errno;
2015: goto out;
2016: }
2017: vs->total += vs->len;
2018: vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2019: if (vs->total < vs->count && vs->len > 0) {
2020: do {
2021: if (0) {
2022: print_sg(vs->sg, vs->cnt);
2023: }
2024: vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2025: vs->off);
2026: if (vs->len > 0) {
2027: vs->off += vs->len;
2028: }
2029: } while (vs->len == -1 && errno == EINTR);
2030: if (vs->len == -1) {
2031: err = -errno;
2032: }
2033: v9fs_read_post_preadv(s, vs, err);
2034: return;
2035: }
2036: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2037: vs->offset += vs->count;
2038: err = vs->offset;
2039:
2040: out:
2041: complete_pdu(s, vs->pdu, err);
2042: qemu_free(vs);
2043: }
2044:
2045: static void v9fs_xattr_read(V9fsState *s, V9fsReadState *vs)
2046: {
2047: ssize_t err = 0;
2048: int read_count;
2049: int64_t xattr_len;
2050:
2051: xattr_len = vs->fidp->fs.xattr.len;
2052: read_count = xattr_len - vs->off;
2053: if (read_count > vs->count) {
2054: read_count = vs->count;
2055: } else if (read_count < 0) {
2056: /*
2057: * read beyond XATTR value
2058: */
2059: read_count = 0;
2060: }
2061: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", read_count);
2062: vs->offset += pdu_pack(vs->pdu, vs->offset,
2063: ((char *)vs->fidp->fs.xattr.value) + vs->off,
2064: read_count);
2065: err = vs->offset;
2066: complete_pdu(s, vs->pdu, err);
2067: qemu_free(vs);
2068: }
2069:
2070: static void v9fs_read(V9fsState *s, V9fsPDU *pdu)
2071: {
2072: int32_t fid;
2073: V9fsReadState *vs;
2074: ssize_t err = 0;
2075:
2076: vs = qemu_malloc(sizeof(*vs));
2077: vs->pdu = pdu;
2078: vs->offset = 7;
2079: vs->total = 0;
2080: vs->len = 0;
2081: vs->count = 0;
2082:
2083: pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
2084:
2085: vs->fidp = lookup_fid(s, fid);
2086: if (vs->fidp == NULL) {
2087: err = -EINVAL;
2088: goto out;
2089: }
2090:
2091: if (vs->fidp->fid_type == P9_FID_DIR) {
2092: vs->max_count = vs->count;
2093: vs->count = 0;
2094: if (vs->off == 0) {
2095: v9fs_do_rewinddir(s, vs->fidp->fs.dir);
2096: }
2097: v9fs_read_post_rewinddir(s, vs, err);
2098: return;
2099: } else if (vs->fidp->fid_type == P9_FID_FILE) {
2100: vs->sg = vs->iov;
2101: pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
2102: vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2103: if (vs->total <= vs->count) {
2104: vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2105: vs->off);
2106: if (vs->len > 0) {
2107: vs->off += vs->len;
2108: }
2109: err = vs->len;
2110: v9fs_read_post_preadv(s, vs, err);
2111: }
2112: return;
2113: } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2114: v9fs_xattr_read(s, vs);
2115: return;
2116: } else {
2117: err = -EINVAL;
2118: }
2119: out:
2120: complete_pdu(s, pdu, err);
2121: qemu_free(vs);
2122: }
2123:
2124: typedef struct V9fsReadDirState {
2125: V9fsPDU *pdu;
2126: V9fsFidState *fidp;
2127: V9fsQID qid;
2128: off_t saved_dir_pos;
2129: struct dirent *dent;
2130: int32_t count;
2131: int32_t max_count;
2132: size_t offset;
2133: int64_t initial_offset;
2134: V9fsString name;
2135: } V9fsReadDirState;
2136:
2137: static void v9fs_readdir_post_seekdir(V9fsState *s, V9fsReadDirState *vs)
2138: {
2139: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2140: vs->offset += vs->count;
2141: complete_pdu(s, vs->pdu, vs->offset);
2142: qemu_free(vs);
2143: return;
2144: }
2145:
2146: /* Size of each dirent on the wire: size of qid (13) + size of offset (8)
2147: * size of type (1) + size of name.size (2) + strlen(name.data)
2148: */
2149: #define V9_READDIR_DATA_SZ (24 + strlen(vs->name.data))
2150:
2151: static void v9fs_readdir_post_readdir(V9fsState *s, V9fsReadDirState *vs)
2152: {
2153: int len;
2154: size_t size;
2155:
2156: if (vs->dent) {
2157: v9fs_string_init(&vs->name);
2158: v9fs_string_sprintf(&vs->name, "%s", vs->dent->d_name);
2159:
2160: if ((vs->count + V9_READDIR_DATA_SZ) > vs->max_count) {
2161: /* Ran out of buffer. Set dir back to old position and return */
2162: v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->saved_dir_pos);
2163: v9fs_readdir_post_seekdir(s, vs);
2164: return;
2165: }
2166:
2167: /* Fill up just the path field of qid because the client uses
2168: * only that. To fill the entire qid structure we will have
2169: * to stat each dirent found, which is expensive
2170: */
2171: size = MIN(sizeof(vs->dent->d_ino), sizeof(vs->qid.path));
2172: memcpy(&vs->qid.path, &vs->dent->d_ino, size);
2173: /* Fill the other fields with dummy values */
2174: vs->qid.type = 0;
2175: vs->qid.version = 0;
2176:
2177: len = pdu_marshal(vs->pdu, vs->offset+4+vs->count, "Qqbs",
2178: &vs->qid, vs->dent->d_off,
2179: vs->dent->d_type, &vs->name);
2180: vs->count += len;
2181: v9fs_string_free(&vs->name);
2182: vs->saved_dir_pos = vs->dent->d_off;
2183: vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
2184: v9fs_readdir_post_readdir(s, vs);
2185: return;
2186: }
2187:
2188: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
2189: vs->offset += vs->count;
2190: complete_pdu(s, vs->pdu, vs->offset);
2191: qemu_free(vs);
2192: return;
2193: }
2194:
2195: static void v9fs_readdir_post_telldir(V9fsState *s, V9fsReadDirState *vs)
2196: {
2197: vs->dent = v9fs_do_readdir(s, vs->fidp->fs.dir);
2198: v9fs_readdir_post_readdir(s, vs);
2199: return;
2200: }
2201:
2202: static void v9fs_readdir_post_setdir(V9fsState *s, V9fsReadDirState *vs)
2203: {
2204: vs->saved_dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
2205: v9fs_readdir_post_telldir(s, vs);
2206: return;
2207: }
2208:
2209: static void v9fs_readdir(V9fsState *s, V9fsPDU *pdu)
2210: {
2211: int32_t fid;
2212: V9fsReadDirState *vs;
2213: ssize_t err = 0;
2214: size_t offset = 7;
2215:
2216: vs = qemu_malloc(sizeof(*vs));
2217: vs->pdu = pdu;
2218: vs->offset = 7;
2219: vs->count = 0;
2220:
2221: pdu_unmarshal(vs->pdu, offset, "dqd", &fid, &vs->initial_offset,
2222: &vs->max_count);
2223:
2224: vs->fidp = lookup_fid(s, fid);
2225: if (vs->fidp == NULL || !(vs->fidp->fs.dir)) {
2226: err = -EINVAL;
2227: goto out;
2228: }
2229:
2230: if (vs->initial_offset == 0) {
2231: v9fs_do_rewinddir(s, vs->fidp->fs.dir);
2232: } else {
2233: v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->initial_offset);
2234: }
2235:
2236: v9fs_readdir_post_setdir(s, vs);
2237: return;
2238:
2239: out:
2240: complete_pdu(s, pdu, err);
2241: qemu_free(vs);
2242: return;
2243: }
2244:
2245: static void v9fs_write_post_pwritev(V9fsState *s, V9fsWriteState *vs,
2246: ssize_t err)
2247: {
2248: if (err < 0) {
2249: /* IO error return the error */
2250: err = -errno;
2251: goto out;
2252: }
2253: vs->total += vs->len;
2254: vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
2255: if (vs->total < vs->count && vs->len > 0) {
2256: do {
2257: if (0) {
2258: print_sg(vs->sg, vs->cnt);
2259: }
2260: vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
2261: vs->off);
2262: if (vs->len > 0) {
2263: vs->off += vs->len;
2264: }
2265: } while (vs->len == -1 && errno == EINTR);
2266: if (vs->len == -1) {
2267: err = -errno;
2268: }
2269: v9fs_write_post_pwritev(s, vs, err);
2270: return;
2271: }
2272: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
2273: err = vs->offset;
2274: out:
2275: complete_pdu(s, vs->pdu, err);
2276: qemu_free(vs);
2277: }
2278:
2279: static void v9fs_xattr_write(V9fsState *s, V9fsWriteState *vs)
2280: {
2281: int i, to_copy;
2282: ssize_t err = 0;
2283: int write_count;
2284: int64_t xattr_len;
2285:
2286: xattr_len = vs->fidp->fs.xattr.len;
2287: write_count = xattr_len - vs->off;
2288: if (write_count > vs->count) {
2289: write_count = vs->count;
2290: } else if (write_count < 0) {
2291: /*
2292: * write beyond XATTR value len specified in
2293: * xattrcreate
2294: */
2295: err = -ENOSPC;
2296: goto out;
2297: }
2298: vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", write_count);
2299: err = vs->offset;
2300: vs->fidp->fs.xattr.copied_len += write_count;
2301: /*
2302: * Now copy the content from sg list
2303: */
2304: for (i = 0; i < vs->cnt; i++) {
2305: if (write_count > vs->sg[i].iov_len) {
2306: to_copy = vs->sg[i].iov_len;
2307: } else {
2308: to_copy = write_count;
2309: }
2310: memcpy((char *)vs->fidp->fs.xattr.value + vs->off,
2311: vs->sg[i].iov_base, to_copy);
2312: /* updating vs->off since we are not using below */
2313: vs->off += to_copy;
2314: write_count -= to_copy;
2315: }
2316: out:
2317: complete_pdu(s, vs->pdu, err);
2318: qemu_free(vs);
2319: }
2320:
2321: static void v9fs_write(V9fsState *s, V9fsPDU *pdu)
2322: {
2323: int32_t fid;
2324: V9fsWriteState *vs;
2325: ssize_t err;
2326:
2327: vs = qemu_malloc(sizeof(*vs));
2328:
2329: vs->pdu = pdu;
2330: vs->offset = 7;
2331: vs->sg = vs->iov;
2332: vs->total = 0;
2333: vs->len = 0;
2334:
2335: pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
2336: vs->sg, &vs->cnt);
2337:
2338: vs->fidp = lookup_fid(s, fid);
2339: if (vs->fidp == NULL) {
2340: err = -EINVAL;
2341: goto out;
2342: }
2343:
2344: if (vs->fidp->fid_type == P9_FID_FILE) {
2345: if (vs->fidp->fs.fd == -1) {
2346: err = -EINVAL;
2347: goto out;
2348: }
2349: } else if (vs->fidp->fid_type == P9_FID_XATTR) {
2350: /*
2351: * setxattr operation
2352: */
2353: v9fs_xattr_write(s, vs);
2354: return;
2355: } else {
2356: err = -EINVAL;
2357: goto out;
2358: }
2359: vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
2360: if (vs->total <= vs->count) {
2361: vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt, vs->off);
2362: if (vs->len > 0) {
2363: vs->off += vs->len;
2364: }
2365: err = vs->len;
2366: v9fs_write_post_pwritev(s, vs, err);
2367: }
2368: return;
2369: out:
2370: complete_pdu(s, vs->pdu, err);
2371: qemu_free(vs);
2372: }
2373:
2374: static void v9fs_create_post_getiounit(V9fsState *s, V9fsCreateState *vs)
2375: {
2376: int err;
2377: v9fs_string_copy(&vs->fidp->path, &vs->fullname);
2378: stat_to_qid(&vs->stbuf, &vs->qid);
2379:
2380: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, vs->iounit);
2381: err = vs->offset;
2382:
2383: complete_pdu(s, vs->pdu, err);
2384: v9fs_string_free(&vs->name);
2385: v9fs_string_free(&vs->extension);
2386: v9fs_string_free(&vs->fullname);
2387: qemu_free(vs);
2388: }
2389:
2390: static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
2391: {
2392: if (err == 0) {
2393: vs->iounit = get_iounit(s, &vs->fidp->path);
2394: v9fs_create_post_getiounit(s, vs);
2395: return;
2396: }
2397:
2398: complete_pdu(s, vs->pdu, err);
2399: v9fs_string_free(&vs->name);
2400: v9fs_string_free(&vs->extension);
2401: v9fs_string_free(&vs->fullname);
2402: qemu_free(vs);
2403: }
2404:
2405: static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err)
2406: {
2407: if (err) {
2408: err = -errno;
2409: }
2410: v9fs_post_create(s, vs, err);
2411: }
2412:
2413: static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs,
2414: int err)
2415: {
2416: if (!vs->fidp->fs.dir) {
2417: err = -errno;
2418: }
2419: vs->fidp->fid_type = P9_FID_DIR;
2420: v9fs_post_create(s, vs, err);
2421: }
2422:
2423: static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs,
2424: int err)
2425: {
2426: if (err) {
2427: err = -errno;
2428: goto out;
2429: }
2430:
2431: vs->fidp->fs.dir = v9fs_do_opendir(s, &vs->fullname);
2432: v9fs_create_post_opendir(s, vs, err);
2433: return;
2434:
2435: out:
2436: v9fs_post_create(s, vs, err);
2437: }
2438:
2439: static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int err)
2440: {
2441: if (err) {
2442: err = -errno;
2443: goto out;
2444: }
2445:
2446: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2447: v9fs_create_post_dir_lstat(s, vs, err);
2448: return;
2449:
2450: out:
2451: v9fs_post_create(s, vs, err);
2452: }
2453:
2454: static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
2455: {
2456: if (err) {
2457: vs->fidp->fid_type = P9_FID_NONE;
2458: close(vs->fidp->fs.fd);
2459: err = -errno;
2460: }
2461: v9fs_post_create(s, vs, err);
2462: return;
2463: }
2464:
2465: static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err)
2466: {
2467: if (vs->fidp->fs.fd == -1) {
2468: err = -errno;
2469: goto out;
2470: }
2471: vs->fidp->fid_type = P9_FID_FILE;
2472: err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
2473: v9fs_create_post_fstat(s, vs, err);
2474:
2475: return;
2476:
2477: out:
2478: v9fs_post_create(s, vs, err);
2479:
2480: }
2481:
2482: static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
2483: {
2484:
2485: if (err == 0 || errno != ENOENT) {
2486: err = -errno;
2487: goto out;
2488: }
2489:
2490: if (vs->perm & P9_STAT_MODE_DIR) {
2491: err = v9fs_do_mkdir(s, vs->fullname.data, vs->perm & 0777,
2492: vs->fidp->uid, -1);
2493: v9fs_create_post_mkdir(s, vs, err);
2494: } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
2495: err = v9fs_do_symlink(s, vs->fidp, vs->extension.data,
2496: vs->fullname.data, -1);
2497: v9fs_create_post_perms(s, vs, err);
2498: } else if (vs->perm & P9_STAT_MODE_LINK) {
2499: int32_t nfid = atoi(vs->extension.data);
2500: V9fsFidState *nfidp = lookup_fid(s, nfid);
2501: if (nfidp == NULL) {
2502: err = -errno;
2503: v9fs_post_create(s, vs, err);
2504: }
2505: err = v9fs_do_link(s, &nfidp->path, &vs->fullname);
2506: v9fs_create_post_perms(s, vs, err);
2507: } else if (vs->perm & P9_STAT_MODE_DEVICE) {
2508: char ctype;
2509: uint32_t major, minor;
2510: mode_t nmode = 0;
2511:
2512: if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major,
2513: &minor) != 3) {
2514: err = -errno;
2515: v9fs_post_create(s, vs, err);
2516: }
2517:
2518: switch (ctype) {
2519: case 'c':
2520: nmode = S_IFCHR;
2521: break;
2522: case 'b':
2523: nmode = S_IFBLK;
2524: break;
2525: default:
2526: err = -EIO;
2527: v9fs_post_create(s, vs, err);
2528: }
2529:
2530: nmode |= vs->perm & 0777;
2531: err = v9fs_do_mknod(s, vs->fullname.data, nmode,
2532: makedev(major, minor), vs->fidp->uid, -1);
2533: v9fs_create_post_perms(s, vs, err);
2534: } else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) {
2535: err = v9fs_do_mknod(s, vs->fullname.data, S_IFIFO | (vs->perm & 0777),
2536: 0, vs->fidp->uid, -1);
2537: v9fs_post_create(s, vs, err);
2538: } else if (vs->perm & P9_STAT_MODE_SOCKET) {
2539: err = v9fs_do_mknod(s, vs->fullname.data, S_IFSOCK | (vs->perm & 0777),
2540: 0, vs->fidp->uid, -1);
2541: v9fs_post_create(s, vs, err);
2542: } else {
2543: vs->fidp->fs.fd = v9fs_do_open2(s, vs->fullname.data, vs->fidp->uid,
2544: -1, omode_to_uflags(vs->mode)|O_CREAT, vs->perm);
2545:
2546: v9fs_create_post_open2(s, vs, err);
2547: }
2548:
2549: return;
2550:
2551: out:
2552: v9fs_post_create(s, vs, err);
2553: }
2554:
2555: static void v9fs_create(V9fsState *s, V9fsPDU *pdu)
2556: {
2557: int32_t fid;
2558: V9fsCreateState *vs;
2559: int err = 0;
2560:
2561: vs = qemu_malloc(sizeof(*vs));
2562: vs->pdu = pdu;
2563: vs->offset = 7;
2564:
2565: v9fs_string_init(&vs->fullname);
2566:
2567: pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name,
2568: &vs->perm, &vs->mode, &vs->extension);
2569:
2570: vs->fidp = lookup_fid(s, fid);
2571: if (vs->fidp == NULL) {
2572: err = -EINVAL;
2573: goto out;
2574: }
2575:
2576: v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
2577: vs->name.data);
2578:
2579: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2580: v9fs_create_post_lstat(s, vs, err);
2581: return;
2582:
2583: out:
2584: complete_pdu(s, vs->pdu, err);
2585: v9fs_string_free(&vs->name);
2586: v9fs_string_free(&vs->extension);
2587: qemu_free(vs);
2588: }
2589:
2590: static void v9fs_post_symlink(V9fsState *s, V9fsSymlinkState *vs, int err)
2591: {
2592: if (err == 0) {
2593: stat_to_qid(&vs->stbuf, &vs->qid);
2594: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
2595: err = vs->offset;
2596: } else {
2597: err = -errno;
2598: }
2599: complete_pdu(s, vs->pdu, err);
2600: v9fs_string_free(&vs->name);
2601: v9fs_string_free(&vs->symname);
2602: v9fs_string_free(&vs->fullname);
2603: qemu_free(vs);
2604: }
2605:
2606: static void v9fs_symlink_post_do_symlink(V9fsState *s, V9fsSymlinkState *vs,
2607: int err)
2608: {
2609: if (err) {
2610: goto out;
2611: }
2612: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
2613: out:
2614: v9fs_post_symlink(s, vs, err);
2615: }
2616:
2617: static void v9fs_symlink(V9fsState *s, V9fsPDU *pdu)
2618: {
2619: int32_t dfid;
2620: V9fsSymlinkState *vs;
2621: int err = 0;
2622: gid_t gid;
2623:
2624: vs = qemu_malloc(sizeof(*vs));
2625: vs->pdu = pdu;
2626: vs->offset = 7;
2627:
2628: v9fs_string_init(&vs->fullname);
2629:
2630: pdu_unmarshal(vs->pdu, vs->offset, "dssd", &dfid, &vs->name,
2631: &vs->symname, &gid);
2632:
2633: vs->dfidp = lookup_fid(s, dfid);
2634: if (vs->dfidp == NULL) {
2635: err = -EINVAL;
2636: goto out;
2637: }
2638:
2639: v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->dfidp->path.data,
2640: vs->name.data);
2641: err = v9fs_do_symlink(s, vs->dfidp, vs->symname.data,
2642: vs->fullname.data, gid);
2643: v9fs_symlink_post_do_symlink(s, vs, err);
2644: return;
2645:
2646: out:
2647: complete_pdu(s, vs->pdu, err);
2648: v9fs_string_free(&vs->name);
2649: v9fs_string_free(&vs->symname);
2650: qemu_free(vs);
2651: }
2652:
2653: static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
2654: {
2655: /* A nop call with no return */
2656: complete_pdu(s, pdu, 7);
2657: }
2658:
2659: static void v9fs_link(V9fsState *s, V9fsPDU *pdu)
2660: {
2661: int32_t dfid, oldfid;
2662: V9fsFidState *dfidp, *oldfidp;
2663: V9fsString name, fullname;
2664: size_t offset = 7;
2665: int err = 0;
2666:
2667: v9fs_string_init(&fullname);
2668:
2669: pdu_unmarshal(pdu, offset, "dds", &dfid, &oldfid, &name);
2670:
2671: dfidp = lookup_fid(s, dfid);
2672: if (dfidp == NULL) {
2673: err = -errno;
2674: goto out;
2675: }
2676:
2677: oldfidp = lookup_fid(s, oldfid);
2678: if (oldfidp == NULL) {
2679: err = -errno;
2680: goto out;
2681: }
2682:
2683: v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
2684: err = offset;
2685: err = v9fs_do_link(s, &oldfidp->path, &fullname);
2686: if (err) {
2687: err = -errno;
2688: }
2689: v9fs_string_free(&fullname);
2690:
2691: out:
2692: v9fs_string_free(&name);
2693: complete_pdu(s, pdu, err);
2694: }
2695:
2696: static void v9fs_remove_post_remove(V9fsState *s, V9fsRemoveState *vs,
2697: int err)
2698: {
2699: if (err < 0) {
2700: err = -errno;
2701: } else {
2702: err = vs->offset;
2703: }
2704:
2705: /* For TREMOVE we need to clunk the fid even on failed remove */
2706: free_fid(s, vs->fidp->fid);
2707:
2708: complete_pdu(s, vs->pdu, err);
2709: qemu_free(vs);
2710: }
2711:
2712: static void v9fs_remove(V9fsState *s, V9fsPDU *pdu)
2713: {
2714: int32_t fid;
2715: V9fsRemoveState *vs;
2716: int err = 0;
2717:
2718: vs = qemu_malloc(sizeof(*vs));
2719: vs->pdu = pdu;
2720: vs->offset = 7;
2721:
2722: pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
2723:
2724: vs->fidp = lookup_fid(s, fid);
2725: if (vs->fidp == NULL) {
2726: err = -EINVAL;
2727: goto out;
2728: }
2729:
2730: err = v9fs_do_remove(s, &vs->fidp->path);
2731: v9fs_remove_post_remove(s, vs, err);
2732: return;
2733:
2734: out:
2735: complete_pdu(s, pdu, err);
2736: qemu_free(vs);
2737: }
2738:
2739: static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err)
2740: {
2741: if (err < 0) {
2742: goto out;
2743: }
2744:
2745: err = vs->offset;
2746:
2747: out:
2748: v9fs_stat_free(&vs->v9stat);
2749: complete_pdu(s, vs->pdu, err);
2750: qemu_free(vs);
2751: }
2752:
2753: static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err)
2754: {
2755: if (err < 0) {
2756: goto out;
2757: }
2758: if (vs->v9stat.length != -1) {
2759: if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) {
2760: err = -errno;
2761: }
2762: }
2763: v9fs_wstat_post_truncate(s, vs, err);
2764: return;
2765:
2766: out:
2767: v9fs_stat_free(&vs->v9stat);
2768: complete_pdu(s, vs->pdu, err);
2769: qemu_free(vs);
2770: }
2771:
2772: static int v9fs_complete_rename(V9fsState *s, V9fsRenameState *vs)
2773: {
2774: int err = 0;
2775: char *old_name, *new_name;
2776: char *end;
2777:
2778: if (vs->newdirfid != -1) {
2779: V9fsFidState *dirfidp;
2780: dirfidp = lookup_fid(s, vs->newdirfid);
2781:
2782: if (dirfidp == NULL) {
2783: err = -ENOENT;
2784: goto out;
2785: }
2786:
2787: BUG_ON(dirfidp->fid_type != P9_FID_NONE);
2788:
2789: new_name = qemu_mallocz(dirfidp->path.size + vs->name.size + 2);
2790:
2791: strcpy(new_name, dirfidp->path.data);
2792: strcat(new_name, "/");
2793: strcat(new_name + dirfidp->path.size, vs->name.data);
2794: } else {
2795: old_name = vs->fidp->path.data;
2796: end = strrchr(old_name, '/');
2797: if (end) {
2798: end++;
2799: } else {
2800: end = old_name;
2801: }
2802: new_name = qemu_mallocz(end - old_name + vs->name.size + 1);
2803:
2804: strncat(new_name, old_name, end - old_name);
2805: strncat(new_name + (end - old_name), vs->name.data, vs->name.size);
2806: }
2807:
2808: v9fs_string_free(&vs->name);
2809: vs->name.data = qemu_strdup(new_name);
2810: vs->name.size = strlen(new_name);
2811:
2812: if (strcmp(new_name, vs->fidp->path.data) != 0) {
2813: if (v9fs_do_rename(s, &vs->fidp->path, &vs->name)) {
2814: err = -errno;
2815: } else {
2816: V9fsFidState *fidp;
2817: /*
2818: * Fixup fid's pointing to the old name to
2819: * start pointing to the new name
2820: */
2821: for (fidp = s->fid_list; fidp; fidp = fidp->next) {
2822: if (vs->fidp == fidp) {
2823: /*
2824: * we replace name of this fid towards the end so
2825: * that our below v9fs_path_is_ancestor check will
2826: * work
2827: */
2828: continue;
2829: }
2830: if (v9fs_path_is_ancestor(&vs->fidp->path, &fidp->path)) {
2831: /* replace the name */
2832: v9fs_fix_path(&fidp->path, &vs->name,
2833: strlen(vs->fidp->path.data));
2834: }
2835: }
2836: v9fs_string_copy(&vs->fidp->path, &vs->name);
2837: }
2838: }
2839: out:
2840: v9fs_string_free(&vs->name);
2841: return err;
2842: }
2843:
2844: static void v9fs_rename_post_rename(V9fsState *s, V9fsRenameState *vs, int err)
2845: {
2846: complete_pdu(s, vs->pdu, err);
2847: qemu_free(vs);
2848: }
2849:
2850: static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err)
2851: {
2852: if (err < 0) {
2853: goto out;
2854: }
2855:
2856: if (vs->v9stat.name.size != 0) {
2857: V9fsRenameState *vr;
2858:
2859: vr = qemu_mallocz(sizeof(V9fsRenameState));
2860: vr->newdirfid = -1;
2861: vr->pdu = vs->pdu;
2862: vr->fidp = vs->fidp;
2863: vr->offset = vs->offset;
2864: vr->name.size = vs->v9stat.name.size;
2865: vr->name.data = qemu_strdup(vs->v9stat.name.data);
2866:
2867: err = v9fs_complete_rename(s, vr);
2868: qemu_free(vr);
2869: }
2870: v9fs_wstat_post_rename(s, vs, err);
2871: return;
2872:
2873: out:
2874: v9fs_stat_free(&vs->v9stat);
2875: complete_pdu(s, vs->pdu, err);
2876: qemu_free(vs);
2877: }
2878:
2879: static void v9fs_rename(V9fsState *s, V9fsPDU *pdu)
2880: {
2881: int32_t fid;
2882: V9fsRenameState *vs;
2883: ssize_t err = 0;
2884:
2885: vs = qemu_malloc(sizeof(*vs));
2886: vs->pdu = pdu;
2887: vs->offset = 7;
2888:
2889: pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &vs->newdirfid, &vs->name);
2890:
2891: vs->fidp = lookup_fid(s, fid);
2892: if (vs->fidp == NULL) {
2893: err = -ENOENT;
2894: goto out;
2895: }
2896:
2897: BUG_ON(vs->fidp->fid_type != P9_FID_NONE);
2898:
2899: err = v9fs_complete_rename(s, vs);
2900: v9fs_rename_post_rename(s, vs, err);
2901: return;
2902: out:
2903: complete_pdu(s, vs->pdu, err);
2904: qemu_free(vs);
2905: }
2906:
2907: static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
2908: {
2909: if (err < 0) {
2910: goto out;
2911: }
2912:
2913: if (vs->v9stat.n_gid != -1 || vs->v9stat.n_uid != -1) {
2914: if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
2915: vs->v9stat.n_gid)) {
2916: err = -errno;
2917: }
2918: }
2919: v9fs_wstat_post_chown(s, vs, err);
2920: return;
2921:
2922: out:
2923: v9fs_stat_free(&vs->v9stat);
2924: complete_pdu(s, vs->pdu, err);
2925: qemu_free(vs);
2926: }
2927:
2928: static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err)
2929: {
2930: if (err < 0) {
2931: goto out;
2932: }
2933:
2934: if (vs->v9stat.mtime != -1 || vs->v9stat.atime != -1) {
2935: struct timespec times[2];
2936: if (vs->v9stat.atime != -1) {
2937: times[0].tv_sec = vs->v9stat.atime;
2938: times[0].tv_nsec = 0;
2939: } else {
2940: times[0].tv_nsec = UTIME_OMIT;
2941: }
2942: if (vs->v9stat.mtime != -1) {
2943: times[1].tv_sec = vs->v9stat.mtime;
2944: times[1].tv_nsec = 0;
2945: } else {
2946: times[1].tv_nsec = UTIME_OMIT;
2947: }
2948:
2949: if (v9fs_do_utimensat(s, &vs->fidp->path, times)) {
2950: err = -errno;
2951: }
2952: }
2953:
2954: v9fs_wstat_post_utime(s, vs, err);
2955: return;
2956:
2957: out:
2958: v9fs_stat_free(&vs->v9stat);
2959: complete_pdu(s, vs->pdu, err);
2960: qemu_free(vs);
2961: }
2962:
2963: static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err)
2964: {
2965: if (err == -1) {
2966: err = -errno;
2967: }
2968: v9fs_stat_free(&vs->v9stat);
2969: complete_pdu(s, vs->pdu, err);
2970: qemu_free(vs);
2971: }
2972:
2973: static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err)
2974: {
2975: uint32_t v9_mode;
2976:
2977: if (err == -1) {
2978: err = -errno;
2979: goto out;
2980: }
2981:
2982: v9_mode = stat_to_v9mode(&vs->stbuf);
2983:
2984: if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
2985: (v9_mode & P9_STAT_MODE_TYPE_BITS)) {
2986: /* Attempting to change the type */
2987: err = -EIO;
2988: goto out;
2989: }
2990:
2991: if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode,
2992: &vs->v9stat.extension))) {
2993: err = -errno;
2994: }
2995: v9fs_wstat_post_chmod(s, vs, err);
2996: return;
2997:
2998: out:
2999: v9fs_stat_free(&vs->v9stat);
3000: complete_pdu(s, vs->pdu, err);
3001: qemu_free(vs);
3002: }
3003:
3004: static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
3005: {
3006: int32_t fid;
3007: V9fsWstatState *vs;
3008: int err = 0;
3009:
3010: vs = qemu_malloc(sizeof(*vs));
3011: vs->pdu = pdu;
3012: vs->offset = 7;
3013:
3014: pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat);
3015:
3016: vs->fidp = lookup_fid(s, fid);
3017: if (vs->fidp == NULL) {
3018: err = -EINVAL;
3019: goto out;
3020: }
3021:
3022: /* do we need to sync the file? */
3023: if (donttouch_stat(&vs->v9stat)) {
3024: err = v9fs_do_fsync(s, vs->fidp->fs.fd, 0);
3025: v9fs_wstat_post_fsync(s, vs, err);
3026: return;
3027: }
3028:
3029: if (vs->v9stat.mode != -1) {
3030: err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
3031: v9fs_wstat_post_lstat(s, vs, err);
3032: return;
3033: }
3034:
3035: v9fs_wstat_post_chmod(s, vs, err);
3036: return;
3037:
3038: out:
3039: v9fs_stat_free(&vs->v9stat);
3040: complete_pdu(s, vs->pdu, err);
3041: qemu_free(vs);
3042: }
3043:
3044: static void v9fs_statfs_post_statfs(V9fsState *s, V9fsStatfsState *vs, int err)
3045: {
3046: int32_t bsize_factor;
3047:
3048: if (err) {
3049: err = -errno;
3050: goto out;
3051: }
3052:
3053: /*
3054: * compute bsize factor based on host file system block size
3055: * and client msize
3056: */
3057: bsize_factor = (s->msize - P9_IOHDRSZ)/vs->stbuf.f_bsize;
3058: if (!bsize_factor) {
3059: bsize_factor = 1;
3060: }
3061: vs->v9statfs.f_type = vs->stbuf.f_type;
3062: vs->v9statfs.f_bsize = vs->stbuf.f_bsize;
3063: vs->v9statfs.f_bsize *= bsize_factor;
3064: /*
3065: * f_bsize is adjusted(multiplied) by bsize factor, so we need to
3066: * adjust(divide) the number of blocks, free blocks and available
3067: * blocks by bsize factor
3068: */
3069: vs->v9statfs.f_blocks = vs->stbuf.f_blocks/bsize_factor;
3070: vs->v9statfs.f_bfree = vs->stbuf.f_bfree/bsize_factor;
3071: vs->v9statfs.f_bavail = vs->stbuf.f_bavail/bsize_factor;
3072: vs->v9statfs.f_files = vs->stbuf.f_files;
3073: vs->v9statfs.f_ffree = vs->stbuf.f_ffree;
3074: vs->v9statfs.fsid_val = (unsigned int) vs->stbuf.f_fsid.__val[0] |
3075: (unsigned long long)vs->stbuf.f_fsid.__val[1] << 32;
3076: vs->v9statfs.f_namelen = vs->stbuf.f_namelen;
3077:
3078: vs->offset += pdu_marshal(vs->pdu, vs->offset, "ddqqqqqqd",
3079: vs->v9statfs.f_type, vs->v9statfs.f_bsize, vs->v9statfs.f_blocks,
3080: vs->v9statfs.f_bfree, vs->v9statfs.f_bavail, vs->v9statfs.f_files,
3081: vs->v9statfs.f_ffree, vs->v9statfs.fsid_val,
3082: vs->v9statfs.f_namelen);
3083:
3084: out:
3085: complete_pdu(s, vs->pdu, vs->offset);
3086: qemu_free(vs);
3087: }
3088:
3089: static void v9fs_statfs(V9fsState *s, V9fsPDU *pdu)
3090: {
3091: V9fsStatfsState *vs;
3092: ssize_t err = 0;
3093:
3094: vs = qemu_malloc(sizeof(*vs));
3095: vs->pdu = pdu;
3096: vs->offset = 7;
3097:
3098: memset(&vs->v9statfs, 0, sizeof(vs->v9statfs));
3099:
3100: pdu_unmarshal(vs->pdu, vs->offset, "d", &vs->fid);
3101:
3102: vs->fidp = lookup_fid(s, vs->fid);
3103: if (vs->fidp == NULL) {
3104: err = -ENOENT;
3105: goto out;
3106: }
3107:
3108: err = v9fs_do_statfs(s, &vs->fidp->path, &vs->stbuf);
3109: v9fs_statfs_post_statfs(s, vs, err);
3110: return;
3111:
3112: out:
3113: complete_pdu(s, vs->pdu, err);
3114: qemu_free(vs);
3115: }
3116:
3117: static void v9fs_mknod_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3118: {
3119: if (err == -1) {
3120: err = -errno;
3121: goto out;
3122: }
3123:
3124: stat_to_qid(&vs->stbuf, &vs->qid);
3125: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3126: err = vs->offset;
3127: out:
3128: complete_pdu(s, vs->pdu, err);
3129: v9fs_string_free(&vs->fullname);
3130: v9fs_string_free(&vs->name);
3131: qemu_free(vs);
3132: }
3133:
3134: static void v9fs_mknod_post_mknod(V9fsState *s, V9fsMkState *vs, int err)
3135: {
3136: if (err == -1) {
3137: err = -errno;
3138: goto out;
3139: }
3140:
3141: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3142: v9fs_mknod_post_lstat(s, vs, err);
3143: return;
3144: out:
3145: complete_pdu(s, vs->pdu, err);
3146: v9fs_string_free(&vs->fullname);
3147: v9fs_string_free(&vs->name);
3148: qemu_free(vs);
3149: }
3150:
3151: static void v9fs_mknod(V9fsState *s, V9fsPDU *pdu)
3152: {
3153: int32_t fid;
3154: V9fsMkState *vs;
3155: int err = 0;
3156: V9fsFidState *fidp;
3157: gid_t gid;
3158: int mode;
3159: int major, minor;
3160:
3161: vs = qemu_malloc(sizeof(*vs));
3162: vs->pdu = pdu;
3163: vs->offset = 7;
3164:
3165: v9fs_string_init(&vs->fullname);
3166: pdu_unmarshal(vs->pdu, vs->offset, "dsdddd", &fid, &vs->name, &mode,
3167: &major, &minor, &gid);
3168:
3169: fidp = lookup_fid(s, fid);
3170: if (fidp == NULL) {
3171: err = -ENOENT;
3172: goto out;
3173: }
3174:
3175: v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3176: err = v9fs_do_mknod(s, vs->fullname.data, mode, makedev(major, minor),
3177: fidp->uid, gid);
3178: v9fs_mknod_post_mknod(s, vs, err);
3179: return;
3180:
3181: out:
3182: complete_pdu(s, vs->pdu, err);
3183: v9fs_string_free(&vs->fullname);
3184: v9fs_string_free(&vs->name);
3185: qemu_free(vs);
3186: }
3187:
3188: /*
3189: * Implement posix byte range locking code
3190: * Server side handling of locking code is very simple, because 9p server in
3191: * QEMU can handle only one client. And most of the lock handling
3192: * (like conflict, merging) etc is done by the VFS layer itself, so no need to
3193: * do any thing in * qemu 9p server side lock code path.
3194: * So when a TLOCK request comes, always return success
3195: */
3196:
3197: static void v9fs_lock(V9fsState *s, V9fsPDU *pdu)
3198: {
3199: int32_t fid, err = 0;
3200: V9fsLockState *vs;
3201:
3202: vs = qemu_mallocz(sizeof(*vs));
3203: vs->pdu = pdu;
3204: vs->offset = 7;
3205:
3206: vs->flock = qemu_malloc(sizeof(*vs->flock));
3207: pdu_unmarshal(vs->pdu, vs->offset, "dbdqqds", &fid, &vs->flock->type,
3208: &vs->flock->flags, &vs->flock->start, &vs->flock->length,
3209: &vs->flock->proc_id, &vs->flock->client_id);
3210:
3211: vs->status = P9_LOCK_ERROR;
3212:
3213: /* We support only block flag now (that too ignored currently) */
3214: if (vs->flock->flags & ~P9_LOCK_FLAGS_BLOCK) {
3215: err = -EINVAL;
3216: goto out;
3217: }
3218: vs->fidp = lookup_fid(s, fid);
3219: if (vs->fidp == NULL) {
3220: err = -ENOENT;
3221: goto out;
3222: }
3223:
3224: err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3225: if (err < 0) {
3226: err = -errno;
3227: goto out;
3228: }
3229: vs->status = P9_LOCK_SUCCESS;
3230: out:
3231: vs->offset += pdu_marshal(vs->pdu, vs->offset, "b", vs->status);
3232: complete_pdu(s, vs->pdu, err);
3233: qemu_free(vs->flock);
3234: qemu_free(vs);
3235: }
3236:
3237: /*
3238: * When a TGETLOCK request comes, always return success because all lock
3239: * handling is done by client's VFS layer.
3240: */
3241:
3242: static void v9fs_getlock(V9fsState *s, V9fsPDU *pdu)
3243: {
3244: int32_t fid, err = 0;
3245: V9fsGetlockState *vs;
3246:
3247: vs = qemu_mallocz(sizeof(*vs));
3248: vs->pdu = pdu;
3249: vs->offset = 7;
3250:
3251: vs->glock = qemu_malloc(sizeof(*vs->glock));
3252: pdu_unmarshal(vs->pdu, vs->offset, "dbqqds", &fid, &vs->glock->type,
3253: &vs->glock->start, &vs->glock->length, &vs->glock->proc_id,
3254: &vs->glock->client_id);
3255:
3256: vs->fidp = lookup_fid(s, fid);
3257: if (vs->fidp == NULL) {
3258: err = -ENOENT;
3259: goto out;
3260: }
3261:
3262: err = v9fs_do_fstat(s, vs->fidp->fs.fd, &vs->stbuf);
3263: if (err < 0) {
3264: err = -errno;
3265: goto out;
3266: }
3267: vs->glock->type = F_UNLCK;
3268: vs->offset += pdu_marshal(vs->pdu, vs->offset, "bqqds", vs->glock->type,
3269: vs->glock->start, vs->glock->length, vs->glock->proc_id,
3270: &vs->glock->client_id);
3271: out:
3272: complete_pdu(s, vs->pdu, err);
3273: qemu_free(vs->glock);
3274: qemu_free(vs);
3275: }
3276:
3277: static void v9fs_mkdir_post_lstat(V9fsState *s, V9fsMkState *vs, int err)
3278: {
3279: if (err == -1) {
3280: err = -errno;
3281: goto out;
3282: }
3283:
3284: stat_to_qid(&vs->stbuf, &vs->qid);
3285: vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
3286: err = vs->offset;
3287: out:
3288: complete_pdu(s, vs->pdu, err);
3289: v9fs_string_free(&vs->fullname);
3290: v9fs_string_free(&vs->name);
3291: qemu_free(vs);
3292: }
3293:
3294: static void v9fs_mkdir_post_mkdir(V9fsState *s, V9fsMkState *vs, int err)
3295: {
3296: if (err == -1) {
3297: err = -errno;
3298: goto out;
3299: }
3300:
3301: err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
3302: v9fs_mkdir_post_lstat(s, vs, err);
3303: return;
3304: out:
3305: complete_pdu(s, vs->pdu, err);
3306: v9fs_string_free(&vs->fullname);
3307: v9fs_string_free(&vs->name);
3308: qemu_free(vs);
3309: }
3310:
3311: static void v9fs_mkdir(V9fsState *s, V9fsPDU *pdu)
3312: {
3313: int32_t fid;
3314: V9fsMkState *vs;
3315: int err = 0;
3316: V9fsFidState *fidp;
3317: gid_t gid;
3318: int mode;
3319:
3320: vs = qemu_malloc(sizeof(*vs));
3321: vs->pdu = pdu;
3322: vs->offset = 7;
3323:
3324: v9fs_string_init(&vs->fullname);
3325: pdu_unmarshal(vs->pdu, vs->offset, "dsdd", &fid, &vs->name, &mode,
3326: &gid);
3327:
3328: fidp = lookup_fid(s, fid);
3329: if (fidp == NULL) {
3330: err = -ENOENT;
3331: goto out;
3332: }
3333:
3334: v9fs_string_sprintf(&vs->fullname, "%s/%s", fidp->path.data, vs->name.data);
3335: err = v9fs_do_mkdir(s, vs->fullname.data, mode, fidp->uid, gid);
3336: v9fs_mkdir_post_mkdir(s, vs, err);
3337: return;
3338:
3339: out:
3340: complete_pdu(s, vs->pdu, err);
3341: v9fs_string_free(&vs->fullname);
3342: v9fs_string_free(&vs->name);
3343: qemu_free(vs);
3344: }
3345:
3346: static void v9fs_post_xattr_getvalue(V9fsState *s, V9fsXattrState *vs, int err)
3347: {
3348:
3349: if (err < 0) {
3350: err = -errno;
3351: free_fid(s, vs->xattr_fidp->fid);
3352: goto out;
3353: }
3354: vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3355: err = vs->offset;
3356: out:
3357: complete_pdu(s, vs->pdu, err);
3358: v9fs_string_free(&vs->name);
3359: qemu_free(vs);
3360: return;
3361: }
3362:
3363: static void v9fs_post_xattr_check(V9fsState *s, V9fsXattrState *vs, ssize_t err)
3364: {
3365: if (err < 0) {
3366: err = -errno;
3367: free_fid(s, vs->xattr_fidp->fid);
3368: goto out;
3369: }
3370: /*
3371: * Read the xattr value
3372: */
3373: vs->xattr_fidp->fs.xattr.len = vs->size;
3374: vs->xattr_fidp->fid_type = P9_FID_XATTR;
3375: vs->xattr_fidp->fs.xattr.copied_len = -1;
3376: if (vs->size) {
3377: vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3378: err = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3379: &vs->name, vs->xattr_fidp->fs.xattr.value,
3380: vs->xattr_fidp->fs.xattr.len);
3381: }
3382: v9fs_post_xattr_getvalue(s, vs, err);
3383: return;
3384: out:
3385: complete_pdu(s, vs->pdu, err);
3386: v9fs_string_free(&vs->name);
3387: qemu_free(vs);
3388: }
3389:
3390: static void v9fs_post_lxattr_getvalue(V9fsState *s,
3391: V9fsXattrState *vs, int err)
3392: {
3393: if (err < 0) {
3394: err = -errno;
3395: free_fid(s, vs->xattr_fidp->fid);
3396: goto out;
3397: }
3398: vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size);
3399: err = vs->offset;
3400: out:
3401: complete_pdu(s, vs->pdu, err);
3402: v9fs_string_free(&vs->name);
3403: qemu_free(vs);
3404: return;
3405: }
3406:
3407: static void v9fs_post_lxattr_check(V9fsState *s,
3408: V9fsXattrState *vs, ssize_t err)
3409: {
3410: if (err < 0) {
3411: err = -errno;
3412: free_fid(s, vs->xattr_fidp->fid);
3413: goto out;
3414: }
3415: /*
3416: * Read the xattr value
3417: */
3418: vs->xattr_fidp->fs.xattr.len = vs->size;
3419: vs->xattr_fidp->fid_type = P9_FID_XATTR;
3420: vs->xattr_fidp->fs.xattr.copied_len = -1;
3421: if (vs->size) {
3422: vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3423: err = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3424: vs->xattr_fidp->fs.xattr.value,
3425: vs->xattr_fidp->fs.xattr.len);
3426: }
3427: v9fs_post_lxattr_getvalue(s, vs, err);
3428: return;
3429: out:
3430: complete_pdu(s, vs->pdu, err);
3431: v9fs_string_free(&vs->name);
3432: qemu_free(vs);
3433: }
3434:
3435: static void v9fs_xattrwalk(V9fsState *s, V9fsPDU *pdu)
3436: {
3437: ssize_t err = 0;
3438: V9fsXattrState *vs;
3439: int32_t fid, newfid;
3440:
3441: vs = qemu_malloc(sizeof(*vs));
3442: vs->pdu = pdu;
3443: vs->offset = 7;
3444:
3445: pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &newfid, &vs->name);
3446: vs->file_fidp = lookup_fid(s, fid);
3447: if (vs->file_fidp == NULL) {
3448: err = -ENOENT;
3449: goto out;
3450: }
3451:
3452: vs->xattr_fidp = alloc_fid(s, newfid);
3453: if (vs->xattr_fidp == NULL) {
3454: err = -EINVAL;
3455: goto out;
3456: }
3457:
3458: v9fs_string_copy(&vs->xattr_fidp->path, &vs->file_fidp->path);
3459: if (vs->name.data[0] == 0) {
3460: /*
3461: * listxattr request. Get the size first
3462: */
3463: vs->size = v9fs_do_llistxattr(s, &vs->xattr_fidp->path,
3464: NULL, 0);
3465: if (vs->size < 0) {
3466: err = vs->size;
3467: }
3468: v9fs_post_lxattr_check(s, vs, err);
3469: return;
3470: } else {
3471: /*
3472: * specific xattr fid. We check for xattr
3473: * presence also collect the xattr size
3474: */
3475: vs->size = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path,
3476: &vs->name, NULL, 0);
3477: if (vs->size < 0) {
3478: err = vs->size;
3479: }
3480: v9fs_post_xattr_check(s, vs, err);
3481: return;
3482: }
3483: out:
3484: complete_pdu(s, vs->pdu, err);
3485: v9fs_string_free(&vs->name);
3486: qemu_free(vs);
3487: }
3488:
3489: static void v9fs_xattrcreate(V9fsState *s, V9fsPDU *pdu)
3490: {
3491: int flags;
3492: int32_t fid;
3493: ssize_t err = 0;
3494: V9fsXattrState *vs;
3495:
3496: vs = qemu_malloc(sizeof(*vs));
3497: vs->pdu = pdu;
3498: vs->offset = 7;
3499:
3500: pdu_unmarshal(vs->pdu, vs->offset, "dsqd",
3501: &fid, &vs->name, &vs->size, &flags);
3502:
3503: vs->file_fidp = lookup_fid(s, fid);
3504: if (vs->file_fidp == NULL) {
3505: err = -EINVAL;
3506: goto out;
3507: }
3508:
3509: /* Make the file fid point to xattr */
3510: vs->xattr_fidp = vs->file_fidp;
3511: vs->xattr_fidp->fid_type = P9_FID_XATTR;
3512: vs->xattr_fidp->fs.xattr.copied_len = 0;
3513: vs->xattr_fidp->fs.xattr.len = vs->size;
3514: vs->xattr_fidp->fs.xattr.flags = flags;
3515: v9fs_string_init(&vs->xattr_fidp->fs.xattr.name);
3516: v9fs_string_copy(&vs->xattr_fidp->fs.xattr.name, &vs->name);
3517: if (vs->size)
3518: vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size);
3519: else
3520: vs->xattr_fidp->fs.xattr.value = NULL;
3521:
3522: out:
3523: complete_pdu(s, vs->pdu, err);
3524: v9fs_string_free(&vs->name);
3525: qemu_free(vs);
3526: }
3527:
3528: static void v9fs_readlink_post_readlink(V9fsState *s, V9fsReadLinkState *vs,
3529: int err)
3530: {
3531: if (err < 0) {
3532: err = -errno;
3533: goto out;
3534: }
3535: vs->offset += pdu_marshal(vs->pdu, vs->offset, "s", &vs->target);
3536: err = vs->offset;
3537: out:
3538: complete_pdu(s, vs->pdu, err);
3539: v9fs_string_free(&vs->target);
3540: qemu_free(vs);
3541: }
3542:
3543: static void v9fs_readlink(V9fsState *s, V9fsPDU *pdu)
3544: {
3545: int32_t fid;
3546: V9fsReadLinkState *vs;
3547: int err = 0;
3548: V9fsFidState *fidp;
3549:
3550: vs = qemu_malloc(sizeof(*vs));
3551: vs->pdu = pdu;
3552: vs->offset = 7;
3553:
3554: pdu_unmarshal(vs->pdu, vs->offset, "d", &fid);
3555:
3556: fidp = lookup_fid(s, fid);
3557: if (fidp == NULL) {
3558: err = -ENOENT;
3559: goto out;
3560: }
3561:
3562: v9fs_string_init(&vs->target);
3563: err = v9fs_do_readlink(s, &fidp->path, &vs->target);
3564: v9fs_readlink_post_readlink(s, vs, err);
3565: return;
3566: out:
3567: complete_pdu(s, vs->pdu, err);
3568: qemu_free(vs);
3569: }
3570:
3571: typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
3572:
3573: static pdu_handler_t *pdu_handlers[] = {
3574: [P9_TREADDIR] = v9fs_readdir,
3575: [P9_TSTATFS] = v9fs_statfs,
3576: [P9_TGETATTR] = v9fs_getattr,
3577: [P9_TSETATTR] = v9fs_setattr,
3578: [P9_TXATTRWALK] = v9fs_xattrwalk,
3579: [P9_TXATTRCREATE] = v9fs_xattrcreate,
3580: [P9_TMKNOD] = v9fs_mknod,
3581: [P9_TRENAME] = v9fs_rename,
3582: [P9_TLOCK] = v9fs_lock,
3583: [P9_TGETLOCK] = v9fs_getlock,
3584: [P9_TREADLINK] = v9fs_readlink,
3585: [P9_TMKDIR] = v9fs_mkdir,
3586: [P9_TVERSION] = v9fs_version,
3587: [P9_TLOPEN] = v9fs_open,
3588: [P9_TATTACH] = v9fs_attach,
3589: [P9_TSTAT] = v9fs_stat,
3590: [P9_TWALK] = v9fs_walk,
3591: [P9_TCLUNK] = v9fs_clunk,
3592: [P9_TFSYNC] = v9fs_fsync,
3593: [P9_TOPEN] = v9fs_open,
3594: [P9_TREAD] = v9fs_read,
3595: #if 0
3596: [P9_TAUTH] = v9fs_auth,
3597: #endif
3598: [P9_TFLUSH] = v9fs_flush,
3599: [P9_TLINK] = v9fs_link,
3600: [P9_TSYMLINK] = v9fs_symlink,
3601: [P9_TCREATE] = v9fs_create,
3602: [P9_TLCREATE] = v9fs_lcreate,
3603: [P9_TWRITE] = v9fs_write,
3604: [P9_TWSTAT] = v9fs_wstat,
3605: [P9_TREMOVE] = v9fs_remove,
3606: };
3607:
3608: static void v9fs_op_not_supp(V9fsState *s, V9fsPDU *pdu)
3609: {
3610: complete_pdu(s, pdu, -EOPNOTSUPP);
3611: }
3612:
3613: static void submit_pdu(V9fsState *s, V9fsPDU *pdu)
3614: {
3615: pdu_handler_t *handler;
3616:
3617: if (debug_9p_pdu) {
3618: pprint_pdu(pdu);
3619: }
3620: if (pdu->id >= ARRAY_SIZE(pdu_handlers) ||
3621: (pdu_handlers[pdu->id] == NULL)) {
3622: handler = v9fs_op_not_supp;
3623: } else {
3624: handler = pdu_handlers[pdu->id];
3625: }
3626: handler(s, pdu);
3627: }
3628:
3629: void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
3630: {
3631: V9fsState *s = (V9fsState *)vdev;
3632: V9fsPDU *pdu;
3633: ssize_t len;
3634:
3635: while ((pdu = alloc_pdu(s)) &&
3636: (len = virtqueue_pop(vq, &pdu->elem)) != 0) {
3637: uint8_t *ptr;
3638:
3639: BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0);
3640: BUG_ON(pdu->elem.out_sg[0].iov_len < 7);
3641:
3642: ptr = pdu->elem.out_sg[0].iov_base;
3643:
3644: memcpy(&pdu->size, ptr, 4);
3645: pdu->id = ptr[4];
3646: memcpy(&pdu->tag, ptr + 5, 2);
3647:
3648: submit_pdu(s, pdu);
3649: }
3650:
3651: free_pdu(s, pdu);
3652: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.