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