hw/9pfs/9p-local.c

   1 /*
   2  * 9p Posix callback
   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 "qemu/osdep.h"
  15 #include "9p.h"
  16 #include "9p-local.h"
  17 #include "9p-xattr.h"
  18 #include "9p-util.h"
  19 #include "fsdev/qemu-fsdev.h"   /* local_ops */
  20 #include <arpa/inet.h>
  21 #include <pwd.h>
  22 #include <grp.h>
  23 #include <sys/socket.h>
  24 #include <sys/un.h>
  25 #include "qemu/xattr.h"
  26 #include "qemu/cutils.h"
  27 #include "qemu/error-report.h"
  28 #include <libgen.h>
  29 #include <linux/fs.h>
  30 #ifdef CONFIG_LINUX_MAGIC_H
  31 #include <linux/magic.h>
  32 #endif
  33 #include <sys/ioctl.h>
  34
  35 #ifndef XFS_SUPER_MAGIC
  36 #define XFS_SUPER_MAGIC  0x58465342
  37 #endif
  38 #ifndef EXT2_SUPER_MAGIC
  39 #define EXT2_SUPER_MAGIC 0xEF53
  40 #endif
  41 #ifndef REISERFS_SUPER_MAGIC
  42 #define REISERFS_SUPER_MAGIC 0x52654973
  43 #endif
  44 #ifndef BTRFS_SUPER_MAGIC
  45 #define BTRFS_SUPER_MAGIC 0x9123683E
  46 #endif
  47
  48 typedef struct {
  49     int mountfd;
  50 } LocalData;
  51
  52 int local_open_nofollow(FsContext *fs_ctx, const char *path, int flags,
  53                         mode_t mode)
  54 {
  55     LocalData *data = fs_ctx->private;
  56
  57     /* All paths are relative to the path data->mountfd points to */
  58     while (*path == '/') {
  59         path++;
  60     }
  61
  62     return relative_openat_nofollow(data->mountfd, path, flags, mode);
  63 }
  64
  65 int local_opendir_nofollow(FsContext *fs_ctx, const char *path)
  66 {
  67     return local_open_nofollow(fs_ctx, path, O_DIRECTORY | O_RDONLY, 0);
  68 }
  69
  70 static void renameat_preserve_errno(int odirfd, const char *opath, int ndirfd,
  71                                     const char *npath)
  72 {
  73     int serrno = errno;
  74     renameat(odirfd, opath, ndirfd, npath);
  75     errno = serrno;
  76 }
  77
  78 #define VIRTFS_META_DIR ".virtfs_metadata"
  79
  80 static char *local_mapped_attr_path(FsContext *ctx, const char *path)
  81 {
  82     int dirlen;
  83     const char *name = strrchr(path, '/');
  84     if (name) {
  85         dirlen = name - path;
  86         ++name;
  87     } else {
  88         name = path;
  89         dirlen = 0;
  90     }
  91     return g_strdup_printf("%s/%.*s/%s/%s", ctx->fs_root,
  92                            dirlen, path, VIRTFS_META_DIR, name);
  93 }
  94
  95 static FILE *local_fopen(const char *path, const char *mode)
  96 {
  97     int fd, o_mode = 0;
  98     FILE *fp;
  99     int flags = O_NOFOLLOW;
 100     /*
 101      * only supports two modes
 102      */
 103     if (mode[0] == 'r') {
 104         flags |= O_RDONLY;
 105     } else if (mode[0] == 'w') {
 106         flags |= O_WRONLY | O_TRUNC | O_CREAT;
 107         o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
 108     } else {
 109         return NULL;
 110     }
 111     fd = open(path, flags, o_mode);
 112     if (fd == -1) {
 113         return NULL;
 114     }
 115     fp = fdopen(fd, mode);
 116     if (!fp) {
 117         close(fd);
 118     }
 119     return fp;
 120 }
 121
 122 static FILE *local_fopenat(int dirfd, const char *name, const char *mode)
 123 {
 124     int fd, o_mode = 0;
 125     FILE *fp;
 126     int flags;
 127     /*
 128      * only supports two modes
 129      */
 130     if (mode[0] == 'r') {
 131         flags = O_RDONLY;
 132     } else if (mode[0] == 'w') {
 133         flags = O_WRONLY | O_TRUNC | O_CREAT;
 134         o_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
 135     } else {
 136         return NULL;
 137     }
 138     fd = openat_file(dirfd, name, flags, o_mode);
 139     if (fd == -1) {
 140         return NULL;
 141     }
 142     fp = fdopen(fd, mode);
 143     if (!fp) {
 144         close(fd);
 145     }
 146     return fp;
 147 }
 148
 149 #define ATTR_MAX 100
 150 static void local_mapped_file_attr(int dirfd, const char *name,
 151                                    struct stat *stbuf)
 152 {
 153     FILE *fp;
 154     char buf[ATTR_MAX];
 155     int map_dirfd;
 156
 157     map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
 158     if (map_dirfd == -1) {
 159         return;
 160     }
 161
 162     fp = local_fopenat(map_dirfd, name, "r");
 163     close_preserve_errno(map_dirfd);
 164     if (!fp) {
 165         return;
 166     }
 167     memset(buf, 0, ATTR_MAX);
 168     while (fgets(buf, ATTR_MAX, fp)) {
 169         if (!strncmp(buf, "virtfs.uid", 10)) {
 170             stbuf->st_uid = atoi(buf+11);
 171         } else if (!strncmp(buf, "virtfs.gid", 10)) {
 172             stbuf->st_gid = atoi(buf+11);
 173         } else if (!strncmp(buf, "virtfs.mode", 11)) {
 174             stbuf->st_mode = atoi(buf+12);
 175         } else if (!strncmp(buf, "virtfs.rdev", 11)) {
 176             stbuf->st_rdev = atoi(buf+12);
 177         }
 178         memset(buf, 0, ATTR_MAX);
 179     }
 180     fclose(fp);
 181 }
 182
 183 static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
 184 {
 185     int err = -1;
 186     char *dirpath = g_path_get_dirname(fs_path->data);
 187     char *name = g_path_get_basename(fs_path->data);
 188     int dirfd;
 189
 190     dirfd = local_opendir_nofollow(fs_ctx, dirpath);
 191     if (dirfd == -1) {
 192         goto out;
 193     }
 194
 195     err = fstatat(dirfd, name, stbuf, AT_SYMLINK_NOFOLLOW);
 196     if (err) {
 197         goto err_out;
 198     }
 199     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 200         /* Actual credentials are part of extended attrs */
 201         uid_t tmp_uid;
 202         gid_t tmp_gid;
 203         mode_t tmp_mode;
 204         dev_t tmp_dev;
 205
 206         if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.uid", &tmp_uid,
 207                                  sizeof(uid_t)) > 0) {
 208             stbuf->st_uid = le32_to_cpu(tmp_uid);
 209         }
 210         if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.gid", &tmp_gid,
 211                                  sizeof(gid_t)) > 0) {
 212             stbuf->st_gid = le32_to_cpu(tmp_gid);
 213         }
 214         if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.mode", &tmp_mode,
 215                                  sizeof(mode_t)) > 0) {
 216             stbuf->st_mode = le32_to_cpu(tmp_mode);
 217         }
 218         if (fgetxattrat_nofollow(dirfd, name, "user.virtfs.rdev", &tmp_dev,
 219                                  sizeof(dev_t)) > 0) {
 220             stbuf->st_rdev = le64_to_cpu(tmp_dev);
 221         }
 222     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 223         local_mapped_file_attr(dirfd, name, stbuf);
 224     }
 225
 226 err_out:
 227     close_preserve_errno(dirfd);
 228 out:
 229     g_free(name);
 230     g_free(dirpath);
 231     return err;
 232 }
 233
 234 static int local_create_mapped_attr_dir(FsContext *ctx, const char *path)
 235 {
 236     int err;
 237     char *attr_dir;
 238     char *tmp_path = g_strdup(path);
 239
 240     attr_dir = g_strdup_printf("%s/%s/%s",
 241              ctx->fs_root, dirname(tmp_path), VIRTFS_META_DIR);
 242
 243     err = mkdir(attr_dir, 0700);
 244     if (err < 0 && errno == EEXIST) {
 245         err = 0;
 246     }
 247     g_free(attr_dir);
 248     g_free(tmp_path);
 249     return err;
 250 }
 251
 252 static int local_set_mapped_file_attr(FsContext *ctx,
 253                                       const char *path, FsCred *credp)
 254 {
 255     FILE *fp;
 256     int ret = 0;
 257     char buf[ATTR_MAX];
 258     char *attr_path;
 259     int uid = -1, gid = -1, mode = -1, rdev = -1;
 260
 261     attr_path = local_mapped_attr_path(ctx, path);
 262     fp = local_fopen(attr_path, "r");
 263     if (!fp) {
 264         goto create_map_file;
 265     }
 266     memset(buf, 0, ATTR_MAX);
 267     while (fgets(buf, ATTR_MAX, fp)) {
 268         if (!strncmp(buf, "virtfs.uid", 10)) {
 269             uid = atoi(buf+11);
 270         } else if (!strncmp(buf, "virtfs.gid", 10)) {
 271             gid = atoi(buf+11);
 272         } else if (!strncmp(buf, "virtfs.mode", 11)) {
 273             mode = atoi(buf+12);
 274         } else if (!strncmp(buf, "virtfs.rdev", 11)) {
 275             rdev = atoi(buf+12);
 276         }
 277         memset(buf, 0, ATTR_MAX);
 278     }
 279     fclose(fp);
 280     goto update_map_file;
 281
 282 create_map_file:
 283     ret = local_create_mapped_attr_dir(ctx, path);
 284     if (ret < 0) {
 285         goto err_out;
 286     }
 287
 288 update_map_file:
 289     fp = local_fopen(attr_path, "w");
 290     if (!fp) {
 291         ret = -1;
 292         goto err_out;
 293     }
 294
 295     if (credp->fc_uid != -1) {
 296         uid = credp->fc_uid;
 297     }
 298     if (credp->fc_gid != -1) {
 299         gid = credp->fc_gid;
 300     }
 301     if (credp->fc_mode != -1) {
 302         mode = credp->fc_mode;
 303     }
 304     if (credp->fc_rdev != -1) {
 305         rdev = credp->fc_rdev;
 306     }
 307
 308
 309     if (uid != -1) {
 310         fprintf(fp, "virtfs.uid=%d\n", uid);
 311     }
 312     if (gid != -1) {
 313         fprintf(fp, "virtfs.gid=%d\n", gid);
 314     }
 315     if (mode != -1) {
 316         fprintf(fp, "virtfs.mode=%d\n", mode);
 317     }
 318     if (rdev != -1) {
 319         fprintf(fp, "virtfs.rdev=%d\n", rdev);
 320     }
 321     fclose(fp);
 322
 323 err_out:
 324     g_free(attr_path);
 325     return ret;
 326 }
 327
 328 static int local_set_xattr(const char *path, FsCred *credp)
 329 {
 330     int err;
 331
 332     if (credp->fc_uid != -1) {
 333         uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
 334         err = setxattr(path, "user.virtfs.uid", &tmp_uid, sizeof(uid_t), 0);
 335         if (err) {
 336             return err;
 337         }
 338     }
 339     if (credp->fc_gid != -1) {
 340         uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
 341         err = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0);
 342         if (err) {
 343             return err;
 344         }
 345     }
 346     if (credp->fc_mode != -1) {
 347         uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
 348         err = setxattr(path, "user.virtfs.mode", &tmp_mode, sizeof(mode_t), 0);
 349         if (err) {
 350             return err;
 351         }
 352     }
 353     if (credp->fc_rdev != -1) {
 354         uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
 355         err = setxattr(path, "user.virtfs.rdev", &tmp_rdev, sizeof(dev_t), 0);
 356         if (err) {
 357             return err;
 358         }
 359     }
 360     return 0;
 361 }
 362
 363 static int local_post_create_passthrough(FsContext *fs_ctx, const char *path,
 364                                          FsCred *credp)
 365 {
 366     char *buffer;
 367
 368     buffer = rpath(fs_ctx, path);
 369     if (lchown(buffer, credp->fc_uid, credp->fc_gid) < 0) {
 370         /*
 371          * If we fail to change ownership and if we are
 372          * using security model none. Ignore the error
 373          */
 374         if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
 375             goto err;
 376         }
 377     }
 378
 379     if (chmod(buffer, credp->fc_mode & 07777) < 0) {
 380         goto err;
 381     }
 382
 383     g_free(buffer);
 384     return 0;
 385 err:
 386     g_free(buffer);
 387     return -1;
 388 }
 389
 390 static ssize_t local_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
 391                               char *buf, size_t bufsz)
 392 {
 393     ssize_t tsize = -1;
 394
 395     if ((fs_ctx->export_flags & V9FS_SM_MAPPED) ||
 396         (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
 397         int fd;
 398
 399         fd = local_open_nofollow(fs_ctx, fs_path->data, O_RDONLY, 0);
 400         if (fd == -1) {
 401             return -1;
 402         }
 403         do {
 404             tsize = read(fd, (void *)buf, bufsz);
 405         } while (tsize == -1 && errno == EINTR);
 406         close_preserve_errno(fd);
 407     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 408                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 409         char *dirpath = g_path_get_dirname(fs_path->data);
 410         char *name = g_path_get_basename(fs_path->data);
 411         int dirfd;
 412
 413         dirfd = local_opendir_nofollow(fs_ctx, dirpath);
 414         if (dirfd == -1) {
 415             goto out;
 416         }
 417
 418         tsize = readlinkat(dirfd, name, buf, bufsz);
 419         close_preserve_errno(dirfd);
 420     out:
 421         g_free(name);
 422         g_free(dirpath);
 423     }
 424     return tsize;
 425 }
 426
 427 static int local_close(FsContext *ctx, V9fsFidOpenState *fs)
 428 {
 429     return close(fs->fd);
 430 }
 431
 432 static int local_closedir(FsContext *ctx, V9fsFidOpenState *fs)
 433 {
 434     return closedir(fs->dir.stream);
 435 }
 436
 437 static int local_open(FsContext *ctx, V9fsPath *fs_path,
 438                       int flags, V9fsFidOpenState *fs)
 439 {
 440     int fd;
 441
 442     fd = local_open_nofollow(ctx, fs_path->data, flags, 0);
 443     if (fd == -1) {
 444         return -1;
 445     }
 446     fs->fd = fd;
 447     return fs->fd;
 448 }
 449
 450 static int local_opendir(FsContext *ctx,
 451                          V9fsPath *fs_path, V9fsFidOpenState *fs)
 452 {
 453     int dirfd;
 454     DIR *stream;
 455
 456     dirfd = local_opendir_nofollow(ctx, fs_path->data);
 457     if (dirfd == -1) {
 458         return -1;
 459     }
 460
 461     stream = fdopendir(dirfd);
 462     if (!stream) {
 463         return -1;
 464     }
 465     fs->dir.stream = stream;
 466     return 0;
 467 }
 468
 469 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
 470 {
 471     rewinddir(fs->dir.stream);
 472 }
 473
 474 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
 475 {
 476     return telldir(fs->dir.stream);
 477 }
 478
 479 static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
 480 {
 481     struct dirent *entry;
 482
 483 again:
 484     entry = readdir(fs->dir.stream);
 485     if (!entry) {
 486         return NULL;
 487     }
 488
 489     if (ctx->export_flags & V9FS_SM_MAPPED) {
 490         entry->d_type = DT_UNKNOWN;
 491     } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 492         if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
 493             /* skp the meta data directory */
 494             goto again;
 495         }
 496         entry->d_type = DT_UNKNOWN;
 497     }
 498
 499     return entry;
 500 }
 501
 502 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
 503 {
 504     seekdir(fs->dir.stream, off);
 505 }
 506
 507 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
 508                             const struct iovec *iov,
 509                             int iovcnt, off_t offset)
 510 {
 511 #ifdef CONFIG_PREADV
 512     return preadv(fs->fd, iov, iovcnt, offset);
 513 #else
 514     int err = lseek(fs->fd, offset, SEEK_SET);
 515     if (err == -1) {
 516         return err;
 517     } else {
 518         return readv(fs->fd, iov, iovcnt);
 519     }
 520 #endif
 521 }
 522
 523 static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
 524                              const struct iovec *iov,
 525                              int iovcnt, off_t offset)
 526 {
 527     ssize_t ret;
 528 #ifdef CONFIG_PREADV
 529     ret = pwritev(fs->fd, iov, iovcnt, offset);
 530 #else
 531     int err = lseek(fs->fd, offset, SEEK_SET);
 532     if (err == -1) {
 533         return err;
 534     } else {
 535         ret = writev(fs->fd, iov, iovcnt);
 536     }
 537 #endif
 538 #ifdef CONFIG_SYNC_FILE_RANGE
 539     if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
 540         /*
 541          * Initiate a writeback. This is not a data integrity sync.
 542          * We want to ensure that we don't leave dirty pages in the cache
 543          * after write when writeout=immediate is sepcified.
 544          */
 545         sync_file_range(fs->fd, offset, ret,
 546                         SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
 547     }
 548 #endif
 549     return ret;
 550 }
 551
 552 static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 553 {
 554     char *buffer;
 555     int ret = -1;
 556     char *path = fs_path->data;
 557
 558     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 559         buffer = rpath(fs_ctx, path);
 560         ret = local_set_xattr(buffer, credp);
 561         g_free(buffer);
 562     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 563         return local_set_mapped_file_attr(fs_ctx, path, credp);
 564     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 565                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 566         buffer = rpath(fs_ctx, path);
 567         ret = chmod(buffer, credp->fc_mode);
 568         g_free(buffer);
 569     }
 570     return ret;
 571 }
 572
 573 static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
 574                        const char *name, FsCred *credp)
 575 {
 576     char *path;
 577     int err = -1;
 578     int serrno = 0;
 579     V9fsString fullname;
 580     char *buffer = NULL;
 581
 582     v9fs_string_init(&fullname);
 583     v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
 584     path = fullname.data;
 585
 586     /* Determine the security model */
 587     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 588         buffer = rpath(fs_ctx, path);
 589         err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
 590         if (err == -1) {
 591             goto out;
 592         }
 593         err = local_set_xattr(buffer, credp);
 594         if (err == -1) {
 595             serrno = errno;
 596             goto err_end;
 597         }
 598     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 599
 600         buffer = rpath(fs_ctx, path);
 601         err = mknod(buffer, SM_LOCAL_MODE_BITS|S_IFREG, 0);
 602         if (err == -1) {
 603             goto out;
 604         }
 605         err = local_set_mapped_file_attr(fs_ctx, path, credp);
 606         if (err == -1) {
 607             serrno = errno;
 608             goto err_end;
 609         }
 610     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 611                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 612         buffer = rpath(fs_ctx, path);
 613         err = mknod(buffer, credp->fc_mode, credp->fc_rdev);
 614         if (err == -1) {
 615             goto out;
 616         }
 617         err = local_post_create_passthrough(fs_ctx, path, credp);
 618         if (err == -1) {
 619             serrno = errno;
 620             goto err_end;
 621         }
 622     }
 623     goto out;
 624
 625 err_end:
 626     remove(buffer);
 627     errno = serrno;
 628 out:
 629     g_free(buffer);
 630     v9fs_string_free(&fullname);
 631     return err;
 632 }
 633
 634 static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
 635                        const char *name, FsCred *credp)
 636 {
 637     char *path;
 638     int err = -1;
 639     int serrno = 0;
 640     V9fsString fullname;
 641     char *buffer = NULL;
 642
 643     v9fs_string_init(&fullname);
 644     v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
 645     path = fullname.data;
 646
 647     /* Determine the security model */
 648     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 649         buffer = rpath(fs_ctx, path);
 650         err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
 651         if (err == -1) {
 652             goto out;
 653         }
 654         credp->fc_mode = credp->fc_mode|S_IFDIR;
 655         err = local_set_xattr(buffer, credp);
 656         if (err == -1) {
 657             serrno = errno;
 658             goto err_end;
 659         }
 660     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 661         buffer = rpath(fs_ctx, path);
 662         err = mkdir(buffer, SM_LOCAL_DIR_MODE_BITS);
 663         if (err == -1) {
 664             goto out;
 665         }
 666         credp->fc_mode = credp->fc_mode|S_IFDIR;
 667         err = local_set_mapped_file_attr(fs_ctx, path, credp);
 668         if (err == -1) {
 669             serrno = errno;
 670             goto err_end;
 671         }
 672     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 673                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 674         buffer = rpath(fs_ctx, path);
 675         err = mkdir(buffer, credp->fc_mode);
 676         if (err == -1) {
 677             goto out;
 678         }
 679         err = local_post_create_passthrough(fs_ctx, path, credp);
 680         if (err == -1) {
 681             serrno = errno;
 682             goto err_end;
 683         }
 684     }
 685     goto out;
 686
 687 err_end:
 688     remove(buffer);
 689     errno = serrno;
 690 out:
 691     g_free(buffer);
 692     v9fs_string_free(&fullname);
 693     return err;
 694 }
 695
 696 static int local_fstat(FsContext *fs_ctx, int fid_type,
 697                        V9fsFidOpenState *fs, struct stat *stbuf)
 698 {
 699     int err, fd;
 700
 701     if (fid_type == P9_FID_DIR) {
 702         fd = dirfd(fs->dir.stream);
 703     } else {
 704         fd = fs->fd;
 705     }
 706
 707     err = fstat(fd, stbuf);
 708     if (err) {
 709         return err;
 710     }
 711     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 712         /* Actual credentials are part of extended attrs */
 713         uid_t tmp_uid;
 714         gid_t tmp_gid;
 715         mode_t tmp_mode;
 716         dev_t tmp_dev;
 717
 718         if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
 719             stbuf->st_uid = le32_to_cpu(tmp_uid);
 720         }
 721         if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
 722             stbuf->st_gid = le32_to_cpu(tmp_gid);
 723         }
 724         if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
 725             stbuf->st_mode = le32_to_cpu(tmp_mode);
 726         }
 727         if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
 728             stbuf->st_rdev = le64_to_cpu(tmp_dev);
 729         }
 730     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 731         errno = EOPNOTSUPP;
 732         return -1;
 733     }
 734     return err;
 735 }
 736
 737 static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
 738                        int flags, FsCred *credp, V9fsFidOpenState *fs)
 739 {
 740     char *path;
 741     int fd = -1;
 742     int err = -1;
 743     int serrno = 0;
 744     V9fsString fullname;
 745     char *buffer = NULL;
 746
 747     /*
 748      * Mark all the open to not follow symlinks
 749      */
 750     flags |= O_NOFOLLOW;
 751
 752     v9fs_string_init(&fullname);
 753     v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
 754     path = fullname.data;
 755
 756     /* Determine the security model */
 757     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 758         buffer = rpath(fs_ctx, path);
 759         fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
 760         if (fd == -1) {
 761             err = fd;
 762             goto out;
 763         }
 764         credp->fc_mode = credp->fc_mode|S_IFREG;
 765         /* Set cleint credentials in xattr */
 766         err = local_set_xattr(buffer, credp);
 767         if (err == -1) {
 768             serrno = errno;
 769             goto err_end;
 770         }
 771     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 772         buffer = rpath(fs_ctx, path);
 773         fd = open(buffer, flags, SM_LOCAL_MODE_BITS);
 774         if (fd == -1) {
 775             err = fd;
 776             goto out;
 777         }
 778         credp->fc_mode = credp->fc_mode|S_IFREG;
 779         /* Set client credentials in .virtfs_metadata directory files */
 780         err = local_set_mapped_file_attr(fs_ctx, path, credp);
 781         if (err == -1) {
 782             serrno = errno;
 783             goto err_end;
 784         }
 785     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 786                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 787         buffer = rpath(fs_ctx, path);
 788         fd = open(buffer, flags, credp->fc_mode);
 789         if (fd == -1) {
 790             err = fd;
 791             goto out;
 792         }
 793         err = local_post_create_passthrough(fs_ctx, path, credp);
 794         if (err == -1) {
 795             serrno = errno;
 796             goto err_end;
 797         }
 798     }
 799     err = fd;
 800     fs->fd = fd;
 801     goto out;
 802
 803 err_end:
 804     close(fd);
 805     remove(buffer);
 806     errno = serrno;
 807 out:
 808     g_free(buffer);
 809     v9fs_string_free(&fullname);
 810     return err;
 811 }
 812
 813
 814 static int local_symlink(FsContext *fs_ctx, const char *oldpath,
 815                          V9fsPath *dir_path, const char *name, FsCred *credp)
 816 {
 817     int err = -1;
 818     int serrno = 0;
 819     char *newpath;
 820     V9fsString fullname;
 821     char *buffer = NULL;
 822
 823     v9fs_string_init(&fullname);
 824     v9fs_string_sprintf(&fullname, "%s/%s", dir_path->data, name);
 825     newpath = fullname.data;
 826
 827     /* Determine the security model */
 828     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 829         int fd;
 830         ssize_t oldpath_size, write_size;
 831         buffer = rpath(fs_ctx, newpath);
 832         fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
 833         if (fd == -1) {
 834             err = fd;
 835             goto out;
 836         }
 837         /* Write the oldpath (target) to the file. */
 838         oldpath_size = strlen(oldpath);
 839         do {
 840             write_size = write(fd, (void *)oldpath, oldpath_size);
 841         } while (write_size == -1 && errno == EINTR);
 842
 843         if (write_size != oldpath_size) {
 844             serrno = errno;
 845             close(fd);
 846             err = -1;
 847             goto err_end;
 848         }
 849         close(fd);
 850         /* Set cleint credentials in symlink's xattr */
 851         credp->fc_mode = credp->fc_mode|S_IFLNK;
 852         err = local_set_xattr(buffer, credp);
 853         if (err == -1) {
 854             serrno = errno;
 855             goto err_end;
 856         }
 857     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 858         int fd;
 859         ssize_t oldpath_size, write_size;
 860         buffer = rpath(fs_ctx, newpath);
 861         fd = open(buffer, O_CREAT|O_EXCL|O_RDWR|O_NOFOLLOW, SM_LOCAL_MODE_BITS);
 862         if (fd == -1) {
 863             err = fd;
 864             goto out;
 865         }
 866         /* Write the oldpath (target) to the file. */
 867         oldpath_size = strlen(oldpath);
 868         do {
 869             write_size = write(fd, (void *)oldpath, oldpath_size);
 870         } while (write_size == -1 && errno == EINTR);
 871
 872         if (write_size != oldpath_size) {
 873             serrno = errno;
 874             close(fd);
 875             err = -1;
 876             goto err_end;
 877         }
 878         close(fd);
 879         /* Set cleint credentials in symlink's xattr */
 880         credp->fc_mode = credp->fc_mode|S_IFLNK;
 881         err = local_set_mapped_file_attr(fs_ctx, newpath, credp);
 882         if (err == -1) {
 883             serrno = errno;
 884             goto err_end;
 885         }
 886     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 887                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 888         buffer = rpath(fs_ctx, newpath);
 889         err = symlink(oldpath, buffer);
 890         if (err) {
 891             goto out;
 892         }
 893         err = lchown(buffer, credp->fc_uid, credp->fc_gid);
 894         if (err == -1) {
 895             /*
 896              * If we fail to change ownership and if we are
 897              * using security model none. Ignore the error
 898              */
 899             if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
 900                 serrno = errno;
 901                 goto err_end;
 902             } else
 903                 err = 0;
 904         }
 905     }
 906     goto out;
 907
 908 err_end:
 909     remove(buffer);
 910     errno = serrno;
 911 out:
 912     g_free(buffer);
 913     v9fs_string_free(&fullname);
 914     return err;
 915 }
 916
 917 static int local_link(FsContext *ctx, V9fsPath *oldpath,
 918                       V9fsPath *dirpath, const char *name)
 919 {
 920     int ret;
 921     V9fsString newpath;
 922     char *buffer, *buffer1;
 923
 924     v9fs_string_init(&newpath);
 925     v9fs_string_sprintf(&newpath, "%s/%s", dirpath->data, name);
 926
 927     buffer = rpath(ctx, oldpath->data);
 928     buffer1 = rpath(ctx, newpath.data);
 929     ret = link(buffer, buffer1);
 930     g_free(buffer);
 931     g_free(buffer1);
 932
 933     /* now link the virtfs_metadata files */
 934     if (!ret && (ctx->export_flags & V9FS_SM_MAPPED_FILE)) {
 935         /* Link the .virtfs_metadata files. Create the metada directory */
 936         ret = local_create_mapped_attr_dir(ctx, newpath.data);
 937         if (ret < 0) {
 938             goto err_out;
 939         }
 940         buffer = local_mapped_attr_path(ctx, oldpath->data);
 941         buffer1 = local_mapped_attr_path(ctx, newpath.data);
 942         ret = link(buffer, buffer1);
 943         g_free(buffer);
 944         g_free(buffer1);
 945         if (ret < 0 && errno != ENOENT) {
 946             goto err_out;
 947         }
 948     }
 949 err_out:
 950     v9fs_string_free(&newpath);
 951     return ret;
 952 }
 953
 954 static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
 955 {
 956     int fd, ret;
 957
 958     fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0);
 959     if (fd == -1) {
 960         return -1;
 961     }
 962     ret = ftruncate(fd, size);
 963     close_preserve_errno(fd);
 964     return ret;
 965 }
 966
 967 static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 968 {
 969     char *buffer;
 970     int ret = -1;
 971     char *path = fs_path->data;
 972
 973     if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
 974         (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 975         (fs_ctx->export_flags & V9FS_SM_NONE)) {
 976         buffer = rpath(fs_ctx, path);
 977         ret = lchown(buffer, credp->fc_uid, credp->fc_gid);
 978         g_free(buffer);
 979     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 980         buffer = rpath(fs_ctx, path);
 981         ret = local_set_xattr(buffer, credp);
 982         g_free(buffer);
 983     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 984         return local_set_mapped_file_attr(fs_ctx, path, credp);
 985     }
 986     return ret;
 987 }
 988
 989 static int local_utimensat(FsContext *s, V9fsPath *fs_path,
 990                            const struct timespec *buf)
 991 {
 992     char *dirpath = g_path_get_dirname(fs_path->data);
 993     char *name = g_path_get_basename(fs_path->data);
 994     int dirfd, ret = -1;
 995
 996     dirfd = local_opendir_nofollow(s, dirpath);
 997     if (dirfd == -1) {
 998         goto out;
 999     }
1000
1001     ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
1002     close_preserve_errno(dirfd);
1003 out:
1004     g_free(dirpath);
1005     g_free(name);
1006     return ret;
1007 }
1008
1009 static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name,
1010                                  int flags)
1011 {
1012     int ret = -1;
1013
1014     if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1015         int map_dirfd;
1016
1017         if (flags == AT_REMOVEDIR) {
1018             int fd;
1019
1020             fd = openat(dirfd, name, O_RDONLY | O_DIRECTORY | O_PATH);
1021             if (fd == -1) {
1022                 goto err_out;
1023             }
1024             /*
1025              * If directory remove .virtfs_metadata contained in the
1026              * directory
1027              */
1028             ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR);
1029             close_preserve_errno(fd);
1030             if (ret < 0 && errno != ENOENT) {
1031                 /*
1032                  * We didn't had the .virtfs_metadata file. May be file created
1033                  * in non-mapped mode ?. Ignore ENOENT.
1034                  */
1035                 goto err_out;
1036             }
1037         }
1038         /*
1039          * Now remove the name from parent directory
1040          * .virtfs_metadata directory.
1041          */
1042         map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
1043         ret = unlinkat(map_dirfd, name, 0);
1044         close_preserve_errno(map_dirfd);
1045         if (ret < 0 && errno != ENOENT) {
1046             /*
1047              * We didn't had the .virtfs_metadata file. May be file created
1048              * in non-mapped mode ?. Ignore ENOENT.
1049              */
1050             goto err_out;
1051         }
1052     }
1053
1054     ret = unlinkat(dirfd, name, flags);
1055 err_out:
1056     return ret;
1057 }
1058
1059 static int local_remove(FsContext *ctx, const char *path)
1060 {
1061     struct stat stbuf;
1062     char *dirpath = g_path_get_dirname(path);
1063     char *name = g_path_get_basename(path);
1064     int flags = 0;
1065     int dirfd;
1066     int err = -1;
1067
1068     dirfd = local_opendir_nofollow(ctx, dirpath);
1069     if (dirfd) {
1070         goto out;
1071     }
1072
1073     if (fstatat(dirfd, path, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) {
1074         goto err_out;
1075     }
1076
1077     if (S_ISDIR(stbuf.st_mode)) {
1078         flags |= AT_REMOVEDIR;
1079     }
1080
1081     err = local_unlinkat_common(ctx, dirfd, name, flags);
1082 err_out:
1083     close_preserve_errno(dirfd);
1084 out:
1085     g_free(name);
1086     g_free(dirpath);
1087     return err;
1088 }
1089
1090 static int local_fsync(FsContext *ctx, int fid_type,
1091                        V9fsFidOpenState *fs, int datasync)
1092 {
1093     int fd;
1094
1095     if (fid_type == P9_FID_DIR) {
1096         fd = dirfd(fs->dir.stream);
1097     } else {
1098         fd = fs->fd;
1099     }
1100
1101     if (datasync) {
1102         return qemu_fdatasync(fd);
1103     } else {
1104         return fsync(fd);
1105     }
1106 }
1107
1108 static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
1109 {
1110     int fd, ret;
1111
1112     fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0);
1113     ret = fstatfs(fd, stbuf);
1114     close_preserve_errno(fd);
1115     return ret;
1116 }
1117
1118 static ssize_t local_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
1119                                const char *name, void *value, size_t size)
1120 {
1121     char *path = fs_path->data;
1122
1123     return v9fs_get_xattr(ctx, path, name, value, size);
1124 }
1125
1126 static ssize_t local_llistxattr(FsContext *ctx, V9fsPath *fs_path,
1127                                 void *value, size_t size)
1128 {
1129     char *path = fs_path->data;
1130
1131     return v9fs_list_xattr(ctx, path, value, size);
1132 }
1133
1134 static int local_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
1135                            void *value, size_t size, int flags)
1136 {
1137     char *path = fs_path->data;
1138
1139     return v9fs_set_xattr(ctx, path, name, value, size, flags);
1140 }
1141
1142 static int local_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
1143                               const char *name)
1144 {
1145     char *path = fs_path->data;
1146
1147     return v9fs_remove_xattr(ctx, path, name);
1148 }
1149
1150 static int local_name_to_path(FsContext *ctx, V9fsPath *dir_path,
1151                               const char *name, V9fsPath *target)
1152 {
1153     if (dir_path) {
1154         v9fs_path_sprintf(target, "%s/%s", dir_path->data, name);
1155     } else {
1156         v9fs_path_sprintf(target, "%s", name);
1157     }
1158     return 0;
1159 }
1160
1161 static int local_renameat(FsContext *ctx, V9fsPath *olddir,
1162                           const char *old_name, V9fsPath *newdir,
1163                           const char *new_name)
1164 {
1165     int ret;
1166     int odirfd, ndirfd;
1167
1168     odirfd = local_opendir_nofollow(ctx, olddir->data);
1169     if (odirfd == -1) {
1170         return -1;
1171     }
1172
1173     ndirfd = local_opendir_nofollow(ctx, newdir->data);
1174     if (ndirfd == -1) {
1175         close_preserve_errno(odirfd);
1176         return -1;
1177     }
1178
1179     ret = renameat(odirfd, old_name, ndirfd, new_name);
1180     if (ret < 0) {
1181         goto out;
1182     }
1183
1184     if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1185         int omap_dirfd, nmap_dirfd;
1186
1187         ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
1188         if (ret < 0 && errno != EEXIST) {
1189             goto err_undo_rename;
1190         }
1191
1192         omap_dirfd = openat(odirfd, VIRTFS_META_DIR,
1193                             O_RDONLY | O_DIRECTORY | O_NOFOLLOW);
1194         if (omap_dirfd == -1) {
1195             goto err;
1196         }
1197
1198         nmap_dirfd = openat(ndirfd, VIRTFS_META_DIR,
1199                             O_RDONLY | O_DIRECTORY | O_NOFOLLOW);
1200         if (nmap_dirfd == -1) {
1201             close_preserve_errno(omap_dirfd);
1202             goto err;
1203         }
1204
1205         /* rename the .virtfs_metadata files */
1206         ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name);
1207         close_preserve_errno(nmap_dirfd);
1208         close_preserve_errno(omap_dirfd);
1209         if (ret < 0 && errno != ENOENT) {
1210             goto err_undo_rename;
1211         }
1212
1213         ret = 0;
1214     }
1215     goto out;
1216
1217 err:
1218     ret = -1;
1219 err_undo_rename:
1220     renameat_preserve_errno(ndirfd, new_name, odirfd, old_name);
1221 out:
1222     close_preserve_errno(ndirfd);
1223     close_preserve_errno(odirfd);
1224     return ret;
1225 }
1226
1227 static void v9fs_path_init_dirname(V9fsPath *path, const char *str)
1228 {
1229     path->data = g_path_get_dirname(str);
1230     path->size = strlen(path->data) + 1;
1231 }
1232
1233 static int local_rename(FsContext *ctx, const char *oldpath,
1234                         const char *newpath)
1235 {
1236     int err;
1237     char *oname = g_path_get_basename(oldpath);
1238     char *nname = g_path_get_basename(newpath);
1239     V9fsPath olddir, newdir;
1240
1241     v9fs_path_init_dirname(&olddir, oldpath);
1242     v9fs_path_init_dirname(&newdir, newpath);
1243
1244     err = local_renameat(ctx, &olddir, oname, &newdir, nname);
1245
1246     v9fs_path_free(&newdir);
1247     v9fs_path_free(&olddir);
1248     g_free(nname);
1249     g_free(oname);
1250
1251     return err;
1252 }
1253
1254 static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
1255                           const char *name, int flags)
1256 {
1257     int ret;
1258     int dirfd;
1259
1260     dirfd = local_opendir_nofollow(ctx, dir->data);
1261     if (dirfd == -1) {
1262         return -1;
1263     }
1264
1265     ret = local_unlinkat_common(ctx, dirfd, name, flags);
1266     close_preserve_errno(dirfd);
1267     return ret;
1268 }
1269
1270 static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
1271                                 mode_t st_mode, uint64_t *st_gen)
1272 {
1273 #ifdef FS_IOC_GETVERSION
1274     int err;
1275     V9fsFidOpenState fid_open;
1276
1277     /*
1278      * Do not try to open special files like device nodes, fifos etc
1279      * We can get fd for regular files and directories only
1280      */
1281     if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
1282         errno = ENOTTY;
1283         return -1;
1284     }
1285     err = local_open(ctx, path, O_RDONLY, &fid_open);
1286     if (err < 0) {
1287         return err;
1288     }
1289     err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
1290     local_close(ctx, &fid_open);
1291     return err;
1292 #else
1293     errno = ENOTTY;
1294     return -1;
1295 #endif
1296 }
1297
1298 static int local_init(FsContext *ctx)
1299 {
1300     struct statfs stbuf;
1301     LocalData *data = g_malloc(sizeof(*data));
1302
1303     data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY);
1304     if (data->mountfd == -1) {
1305         goto err;
1306     }
1307
1308 #ifdef FS_IOC_GETVERSION
1309     /*
1310      * use ioc_getversion only if the ioctl is definied
1311      */
1312     if (fstatfs(data->mountfd, &stbuf) < 0) {
1313         close_preserve_errno(data->mountfd);
1314         goto err;
1315     }
1316     switch (stbuf.f_type) {
1317     case EXT2_SUPER_MAGIC:
1318     case BTRFS_SUPER_MAGIC:
1319     case REISERFS_SUPER_MAGIC:
1320     case XFS_SUPER_MAGIC:
1321         ctx->exops.get_st_gen = local_ioc_getversion;
1322         break;
1323     }
1324 #endif
1325
1326     if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
1327         ctx->xops = passthrough_xattr_ops;
1328     } else if (ctx->export_flags & V9FS_SM_MAPPED) {
1329         ctx->xops = mapped_xattr_ops;
1330     } else if (ctx->export_flags & V9FS_SM_NONE) {
1331         ctx->xops = none_xattr_ops;
1332     } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1333         /*
1334          * xattr operation for mapped-file and passthrough
1335          * remain same.
1336          */
1337         ctx->xops = passthrough_xattr_ops;
1338     }
1339     ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
1340
1341     ctx->private = data;
1342     return 0;
1343
1344 err:
1345     g_free(data);
1346     return -1;
1347 }
1348
1349 static void local_cleanup(FsContext *ctx)
1350 {
1351     LocalData *data = ctx->private;
1352
1353     close(data->mountfd);
1354     g_free(data);
1355 }
1356
1357 static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
1358 {
1359     const char *sec_model = qemu_opt_get(opts, "security_model");
1360     const char *path = qemu_opt_get(opts, "path");
1361
1362     if (!sec_model) {
1363         error_report("Security model not specified, local fs needs security model");
1364         error_printf("valid options are:"
1365                      "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n");
1366         return -1;
1367     }
1368
1369     if (!strcmp(sec_model, "passthrough")) {
1370         fse->export_flags |= V9FS_SM_PASSTHROUGH;
1371     } else if (!strcmp(sec_model, "mapped") ||
1372                !strcmp(sec_model, "mapped-xattr")) {
1373         fse->export_flags |= V9FS_SM_MAPPED;
1374     } else if (!strcmp(sec_model, "none")) {
1375         fse->export_flags |= V9FS_SM_NONE;
1376     } else if (!strcmp(sec_model, "mapped-file")) {
1377         fse->export_flags |= V9FS_SM_MAPPED_FILE;
1378     } else {
1379         error_report("Invalid security model %s specified", sec_model);
1380         error_printf("valid options are:"
1381                      "\t[passthrough|mapped-xattr|mapped-file|none]\n");
1382         return -1;
1383     }
1384
1385     if (!path) {
1386         error_report("fsdev: No path specified");
1387         return -1;
1388     }
1389     fse->path = g_strdup(path);
1390
1391     return 0;
1392 }
1393
1394 FileOperations local_ops = {
1395     .parse_opts = local_parse_opts,
1396     .init  = local_init,
1397     .cleanup = local_cleanup,
1398     .lstat = local_lstat,
1399     .readlink = local_readlink,
1400     .close = local_close,
1401     .closedir = local_closedir,
1402     .open = local_open,
1403     .opendir = local_opendir,
1404     .rewinddir = local_rewinddir,
1405     .telldir = local_telldir,
1406     .readdir = local_readdir,
1407     .seekdir = local_seekdir,
1408     .preadv = local_preadv,
1409     .pwritev = local_pwritev,
1410     .chmod = local_chmod,
1411     .mknod = local_mknod,
1412     .mkdir = local_mkdir,
1413     .fstat = local_fstat,
1414     .open2 = local_open2,
1415     .symlink = local_symlink,
1416     .link = local_link,
1417     .truncate = local_truncate,
1418     .rename = local_rename,
1419     .chown = local_chown,
1420     .utimensat = local_utimensat,
1421     .remove = local_remove,
1422     .fsync = local_fsync,
1423     .statfs = local_statfs,
1424     .lgetxattr = local_lgetxattr,
1425     .llistxattr = local_llistxattr,
1426     .lsetxattr = local_lsetxattr,
1427     .lremovexattr = local_lremovexattr,
1428     .name_to_path = local_name_to_path,
1429     .renameat  = local_renameat,
1430     .unlinkat = local_unlinkat,
1431 };