hw/virtio-9p.c

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