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) < 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         close(dirfd);
 439         return -1;
 440     }
 441     fs->dir.stream = stream;
 442     return 0;
 443 }
 444
 445 static void local_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
 446 {
 447     rewinddir(fs->dir.stream);
 448 }
 449
 450 static off_t local_telldir(FsContext *ctx, V9fsFidOpenState *fs)
 451 {
 452     return telldir(fs->dir.stream);
 453 }
 454
 455 static struct dirent *local_readdir(FsContext *ctx, V9fsFidOpenState *fs)
 456 {
 457     struct dirent *entry;
 458
 459 again:
 460     entry = readdir(fs->dir.stream);
 461     if (!entry) {
 462         return NULL;
 463     }
 464
 465     if (ctx->export_flags & V9FS_SM_MAPPED) {
 466         entry->d_type = DT_UNKNOWN;
 467     } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 468         if (!strcmp(entry->d_name, VIRTFS_META_DIR)) {
 469             /* skp the meta data directory */
 470             goto again;
 471         }
 472         entry->d_type = DT_UNKNOWN;
 473     }
 474
 475     return entry;
 476 }
 477
 478 static void local_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
 479 {
 480     seekdir(fs->dir.stream, off);
 481 }
 482
 483 static ssize_t local_preadv(FsContext *ctx, V9fsFidOpenState *fs,
 484                             const struct iovec *iov,
 485                             int iovcnt, off_t offset)
 486 {
 487 #ifdef CONFIG_PREADV
 488     return preadv(fs->fd, iov, iovcnt, offset);
 489 #else
 490     int err = lseek(fs->fd, offset, SEEK_SET);
 491     if (err == -1) {
 492         return err;
 493     } else {
 494         return readv(fs->fd, iov, iovcnt);
 495     }
 496 #endif
 497 }
 498
 499 static ssize_t local_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
 500                              const struct iovec *iov,
 501                              int iovcnt, off_t offset)
 502 {
 503     ssize_t ret;
 504 #ifdef CONFIG_PREADV
 505     ret = pwritev(fs->fd, iov, iovcnt, offset);
 506 #else
 507     int err = lseek(fs->fd, offset, SEEK_SET);
 508     if (err == -1) {
 509         return err;
 510     } else {
 511         ret = writev(fs->fd, iov, iovcnt);
 512     }
 513 #endif
 514 #ifdef CONFIG_SYNC_FILE_RANGE
 515     if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
 516         /*
 517          * Initiate a writeback. This is not a data integrity sync.
 518          * We want to ensure that we don't leave dirty pages in the cache
 519          * after write when writeout=immediate is sepcified.
 520          */
 521         sync_file_range(fs->fd, offset, ret,
 522                         SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
 523     }
 524 #endif
 525     return ret;
 526 }
 527
 528 static int local_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 529 {
 530     char *dirpath = g_path_get_dirname(fs_path->data);
 531     char *name = g_path_get_basename(fs_path->data);
 532     int ret = -1;
 533     int dirfd;
 534
 535     dirfd = local_opendir_nofollow(fs_ctx, dirpath);
 536     if (dirfd == -1) {
 537         goto out;
 538     }
 539
 540     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 541         ret = local_set_xattrat(dirfd, name, credp);
 542     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 543         ret = local_set_mapped_file_attrat(dirfd, name, credp);
 544     } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
 545                fs_ctx->export_flags & V9FS_SM_NONE) {
 546         ret = fchmodat_nofollow(dirfd, name, credp->fc_mode);
 547     }
 548     close_preserve_errno(dirfd);
 549
 550 out:
 551     g_free(dirpath);
 552     g_free(name);
 553     return ret;
 554 }
 555
 556 static int local_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
 557                        const char *name, FsCred *credp)
 558 {
 559     int err = -1;
 560     int dirfd;
 561
 562     dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
 563     if (dirfd == -1) {
 564         return -1;
 565     }
 566
 567     if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
 568         fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 569         err = mknodat(dirfd, name, SM_LOCAL_MODE_BITS | S_IFREG, 0);
 570         if (err == -1) {
 571             goto out;
 572         }
 573
 574         if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 575             err = local_set_xattrat(dirfd, name, credp);
 576         } else {
 577             err = local_set_mapped_file_attrat(dirfd, name, credp);
 578         }
 579         if (err == -1) {
 580             goto err_end;
 581         }
 582     } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
 583                fs_ctx->export_flags & V9FS_SM_NONE) {
 584         err = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev);
 585         if (err == -1) {
 586             goto out;
 587         }
 588         err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
 589         if (err == -1) {
 590             goto err_end;
 591         }
 592     }
 593     goto out;
 594
 595 err_end:
 596     unlinkat_preserve_errno(dirfd, name, 0);
 597 out:
 598     close_preserve_errno(dirfd);
 599     return err;
 600 }
 601
 602 static int local_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
 603                        const char *name, FsCred *credp)
 604 {
 605     int err = -1;
 606     int dirfd;
 607
 608     dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
 609     if (dirfd == -1) {
 610         return -1;
 611     }
 612
 613     if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
 614         fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 615         err = mkdirat(dirfd, name, SM_LOCAL_DIR_MODE_BITS);
 616         if (err == -1) {
 617             goto out;
 618         }
 619         credp->fc_mode = credp->fc_mode | S_IFDIR;
 620
 621         if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 622             err = local_set_xattrat(dirfd, name, credp);
 623         } else {
 624             err = local_set_mapped_file_attrat(dirfd, name, credp);
 625         }
 626         if (err == -1) {
 627             goto err_end;
 628         }
 629     } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
 630                fs_ctx->export_flags & V9FS_SM_NONE) {
 631         err = mkdirat(dirfd, name, credp->fc_mode);
 632         if (err == -1) {
 633             goto out;
 634         }
 635         err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
 636         if (err == -1) {
 637             goto err_end;
 638         }
 639     }
 640     goto out;
 641
 642 err_end:
 643     unlinkat_preserve_errno(dirfd, name, AT_REMOVEDIR);
 644 out:
 645     close_preserve_errno(dirfd);
 646     return err;
 647 }
 648
 649 static int local_fstat(FsContext *fs_ctx, int fid_type,
 650                        V9fsFidOpenState *fs, struct stat *stbuf)
 651 {
 652     int err, fd;
 653
 654     if (fid_type == P9_FID_DIR) {
 655         fd = dirfd(fs->dir.stream);
 656     } else {
 657         fd = fs->fd;
 658     }
 659
 660     err = fstat(fd, stbuf);
 661     if (err) {
 662         return err;
 663     }
 664     if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 665         /* Actual credentials are part of extended attrs */
 666         uid_t tmp_uid;
 667         gid_t tmp_gid;
 668         mode_t tmp_mode;
 669         dev_t tmp_dev;
 670
 671         if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
 672             stbuf->st_uid = le32_to_cpu(tmp_uid);
 673         }
 674         if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
 675             stbuf->st_gid = le32_to_cpu(tmp_gid);
 676         }
 677         if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
 678             stbuf->st_mode = le32_to_cpu(tmp_mode);
 679         }
 680         if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
 681             stbuf->st_rdev = le64_to_cpu(tmp_dev);
 682         }
 683     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 684         errno = EOPNOTSUPP;
 685         return -1;
 686     }
 687     return err;
 688 }
 689
 690 static int local_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
 691                        int flags, FsCred *credp, V9fsFidOpenState *fs)
 692 {
 693     int fd = -1;
 694     int err = -1;
 695     int dirfd;
 696
 697     /*
 698      * Mark all the open to not follow symlinks
 699      */
 700     flags |= O_NOFOLLOW;
 701
 702     dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
 703     if (dirfd == -1) {
 704         return -1;
 705     }
 706
 707     /* Determine the security model */
 708     if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
 709         fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 710         fd = openat_file(dirfd, name, flags, SM_LOCAL_MODE_BITS);
 711         if (fd == -1) {
 712             goto out;
 713         }
 714         credp->fc_mode = credp->fc_mode|S_IFREG;
 715         if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 716             /* Set cleint credentials in xattr */
 717             err = local_set_xattrat(dirfd, name, credp);
 718         } else {
 719             err = local_set_mapped_file_attrat(dirfd, name, credp);
 720         }
 721         if (err == -1) {
 722             goto err_end;
 723         }
 724     } else if ((fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 725                (fs_ctx->export_flags & V9FS_SM_NONE)) {
 726         fd = openat_file(dirfd, name, flags, credp->fc_mode);
 727         if (fd == -1) {
 728             goto out;
 729         }
 730         err = local_set_cred_passthrough(fs_ctx, dirfd, name, credp);
 731         if (err == -1) {
 732             goto err_end;
 733         }
 734     }
 735     err = fd;
 736     fs->fd = fd;
 737     goto out;
 738
 739 err_end:
 740     unlinkat_preserve_errno(dirfd, name,
 741                             flags & O_DIRECTORY ? AT_REMOVEDIR : 0);
 742     close_preserve_errno(fd);
 743 out:
 744     close_preserve_errno(dirfd);
 745     return err;
 746 }
 747
 748
 749 static int local_symlink(FsContext *fs_ctx, const char *oldpath,
 750                          V9fsPath *dir_path, const char *name, FsCred *credp)
 751 {
 752     int err = -1;
 753     int dirfd;
 754
 755     dirfd = local_opendir_nofollow(fs_ctx, dir_path->data);
 756     if (dirfd == -1) {
 757         return -1;
 758     }
 759
 760     /* Determine the security model */
 761     if (fs_ctx->export_flags & V9FS_SM_MAPPED ||
 762         fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 763         int fd;
 764         ssize_t oldpath_size, write_size;
 765
 766         fd = openat_file(dirfd, name, O_CREAT | O_EXCL | O_RDWR,
 767                          SM_LOCAL_MODE_BITS);
 768         if (fd == -1) {
 769             goto out;
 770         }
 771         /* Write the oldpath (target) to the file. */
 772         oldpath_size = strlen(oldpath);
 773         do {
 774             write_size = write(fd, (void *)oldpath, oldpath_size);
 775         } while (write_size == -1 && errno == EINTR);
 776         close_preserve_errno(fd);
 777
 778         if (write_size != oldpath_size) {
 779             goto err_end;
 780         }
 781         /* Set cleint credentials in symlink's xattr */
 782         credp->fc_mode = credp->fc_mode | S_IFLNK;
 783
 784         if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 785             err = local_set_xattrat(dirfd, name, credp);
 786         } else {
 787             err = local_set_mapped_file_attrat(dirfd, name, credp);
 788         }
 789         if (err == -1) {
 790             goto err_end;
 791         }
 792     } else if (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH ||
 793                fs_ctx->export_flags & V9FS_SM_NONE) {
 794         err = symlinkat(oldpath, dirfd, name);
 795         if (err) {
 796             goto out;
 797         }
 798         err = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
 799                        AT_SYMLINK_NOFOLLOW);
 800         if (err == -1) {
 801             /*
 802              * If we fail to change ownership and if we are
 803              * using security model none. Ignore the error
 804              */
 805             if ((fs_ctx->export_flags & V9FS_SEC_MASK) != V9FS_SM_NONE) {
 806                 goto err_end;
 807             } else {
 808                 err = 0;
 809             }
 810         }
 811     }
 812     goto out;
 813
 814 err_end:
 815     unlinkat_preserve_errno(dirfd, name, 0);
 816 out:
 817     close_preserve_errno(dirfd);
 818     return err;
 819 }
 820
 821 static int local_link(FsContext *ctx, V9fsPath *oldpath,
 822                       V9fsPath *dirpath, const char *name)
 823 {
 824     char *odirpath = g_path_get_dirname(oldpath->data);
 825     char *oname = g_path_get_basename(oldpath->data);
 826     int ret = -1;
 827     int odirfd, ndirfd;
 828
 829     odirfd = local_opendir_nofollow(ctx, odirpath);
 830     if (odirfd == -1) {
 831         goto out;
 832     }
 833
 834     ndirfd = local_opendir_nofollow(ctx, dirpath->data);
 835     if (ndirfd == -1) {
 836         close_preserve_errno(odirfd);
 837         goto out;
 838     }
 839
 840     ret = linkat(odirfd, oname, ndirfd, name, 0);
 841     if (ret < 0) {
 842         goto out_close;
 843     }
 844
 845     /* now link the virtfs_metadata files */
 846     if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 847         int omap_dirfd, nmap_dirfd;
 848
 849         ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
 850         if (ret < 0 && errno != EEXIST) {
 851             goto err_undo_link;
 852         }
 853
 854         omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR);
 855         if (omap_dirfd == -1) {
 856             goto err;
 857         }
 858
 859         nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR);
 860         if (nmap_dirfd == -1) {
 861             close_preserve_errno(omap_dirfd);
 862             goto err;
 863         }
 864
 865         ret = linkat(omap_dirfd, oname, nmap_dirfd, name, 0);
 866         close_preserve_errno(nmap_dirfd);
 867         close_preserve_errno(omap_dirfd);
 868         if (ret < 0 && errno != ENOENT) {
 869             goto err_undo_link;
 870         }
 871
 872         ret = 0;
 873     }
 874     goto out_close;
 875
 876 err:
 877     ret = -1;
 878 err_undo_link:
 879     unlinkat_preserve_errno(ndirfd, name, 0);
 880 out_close:
 881     close_preserve_errno(ndirfd);
 882     close_preserve_errno(odirfd);
 883 out:
 884     g_free(oname);
 885     g_free(odirpath);
 886     return ret;
 887 }
 888
 889 static int local_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
 890 {
 891     int fd, ret;
 892
 893     fd = local_open_nofollow(ctx, fs_path->data, O_WRONLY, 0);
 894     if (fd == -1) {
 895         return -1;
 896     }
 897     ret = ftruncate(fd, size);
 898     close_preserve_errno(fd);
 899     return ret;
 900 }
 901
 902 static int local_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 903 {
 904     char *dirpath = g_path_get_dirname(fs_path->data);
 905     char *name = g_path_get_basename(fs_path->data);
 906     int ret = -1;
 907     int dirfd;
 908
 909     dirfd = local_opendir_nofollow(fs_ctx, dirpath);
 910     if (dirfd == -1) {
 911         goto out;
 912     }
 913
 914     if ((credp->fc_uid == -1 && credp->fc_gid == -1) ||
 915         (fs_ctx->export_flags & V9FS_SM_PASSTHROUGH) ||
 916         (fs_ctx->export_flags & V9FS_SM_NONE)) {
 917         ret = fchownat(dirfd, name, credp->fc_uid, credp->fc_gid,
 918                        AT_SYMLINK_NOFOLLOW);
 919     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED) {
 920         ret = local_set_xattrat(dirfd, name, credp);
 921     } else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 922         ret = local_set_mapped_file_attrat(dirfd, name, credp);
 923     }
 924
 925     close_preserve_errno(dirfd);
 926 out:
 927     g_free(name);
 928     g_free(dirpath);
 929     return ret;
 930 }
 931
 932 static int local_utimensat(FsContext *s, V9fsPath *fs_path,
 933                            const struct timespec *buf)
 934 {
 935     char *dirpath = g_path_get_dirname(fs_path->data);
 936     char *name = g_path_get_basename(fs_path->data);
 937     int dirfd, ret = -1;
 938
 939     dirfd = local_opendir_nofollow(s, dirpath);
 940     if (dirfd == -1) {
 941         goto out;
 942     }
 943
 944     ret = utimensat(dirfd, name, buf, AT_SYMLINK_NOFOLLOW);
 945     close_preserve_errno(dirfd);
 946 out:
 947     g_free(dirpath);
 948     g_free(name);
 949     return ret;
 950 }
 951
 952 static int local_unlinkat_common(FsContext *ctx, int dirfd, const char *name,
 953                                  int flags)
 954 {
 955     int ret = -1;
 956
 957     if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
 958         int map_dirfd;
 959
 960         /* We need to remove the metadata as well:
 961          * - the metadata directory if we're removing a directory
 962          * - the metadata file in the parent's metadata directory
 963          *
 964          * If any of these are missing (ie, ENOENT) then we're probably
 965          * trying to remove something that wasn't created in mapped-file
 966          * mode. We just ignore the error.
 967          */
 968         if (flags == AT_REMOVEDIR) {
 969             int fd;
 970
 971             fd = openat_dir(dirfd, name);
 972             if (fd == -1) {
 973                 goto err_out;
 974             }
 975             ret = unlinkat(fd, VIRTFS_META_DIR, AT_REMOVEDIR);
 976             close_preserve_errno(fd);
 977             if (ret < 0 && errno != ENOENT) {
 978                 goto err_out;
 979             }
 980         }
 981         map_dirfd = openat_dir(dirfd, VIRTFS_META_DIR);
 982         if (map_dirfd != -1) {
 983             ret = unlinkat(map_dirfd, name, 0);
 984             close_preserve_errno(map_dirfd);
 985             if (ret < 0 && errno != ENOENT) {
 986                 goto err_out;
 987             }
 988         } else if (errno != ENOENT) {
 989             goto err_out;
 990         }
 991     }
 992
 993     ret = unlinkat(dirfd, name, flags);
 994 err_out:
 995     return ret;
 996 }
 997
 998 static int local_remove(FsContext *ctx, const char *path)
 999 {
1000     struct stat stbuf;
1001     char *dirpath = g_path_get_dirname(path);
1002     char *name = g_path_get_basename(path);
1003     int flags = 0;
1004     int dirfd;
1005     int err = -1;
1006
1007     dirfd = local_opendir_nofollow(ctx, dirpath);
1008     if (dirfd == -1) {
1009         goto out;
1010     }
1011
1012     if (fstatat(dirfd, name, &stbuf, AT_SYMLINK_NOFOLLOW) < 0) {
1013         goto err_out;
1014     }
1015
1016     if (S_ISDIR(stbuf.st_mode)) {
1017         flags |= AT_REMOVEDIR;
1018     }
1019
1020     err = local_unlinkat_common(ctx, dirfd, name, flags);
1021 err_out:
1022     close_preserve_errno(dirfd);
1023 out:
1024     g_free(name);
1025     g_free(dirpath);
1026     return err;
1027 }
1028
1029 static int local_fsync(FsContext *ctx, int fid_type,
1030                        V9fsFidOpenState *fs, int datasync)
1031 {
1032     int fd;
1033
1034     if (fid_type == P9_FID_DIR) {
1035         fd = dirfd(fs->dir.stream);
1036     } else {
1037         fd = fs->fd;
1038     }
1039
1040     if (datasync) {
1041         return qemu_fdatasync(fd);
1042     } else {
1043         return fsync(fd);
1044     }
1045 }
1046
1047 static int local_statfs(FsContext *s, V9fsPath *fs_path, struct statfs *stbuf)
1048 {
1049     int fd, ret;
1050
1051     fd = local_open_nofollow(s, fs_path->data, O_RDONLY, 0);
1052     if (fd == -1) {
1053         return -1;
1054     }
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 if (strcmp(name, "/")) {
1098         v9fs_path_sprintf(target, "%s", name);
1099     } else {
1100         /* We want the path of the export root to be relative, otherwise
1101          * "*at()" syscalls would treat it as "/" in the host.
1102          */
1103         v9fs_path_sprintf(target, "%s", ".");
1104     }
1105     return 0;
1106 }
1107
1108 static int local_renameat(FsContext *ctx, V9fsPath *olddir,
1109                           const char *old_name, V9fsPath *newdir,
1110                           const char *new_name)
1111 {
1112     int ret;
1113     int odirfd, ndirfd;
1114
1115     odirfd = local_opendir_nofollow(ctx, olddir->data);
1116     if (odirfd == -1) {
1117         return -1;
1118     }
1119
1120     ndirfd = local_opendir_nofollow(ctx, newdir->data);
1121     if (ndirfd == -1) {
1122         close_preserve_errno(odirfd);
1123         return -1;
1124     }
1125
1126     ret = renameat(odirfd, old_name, ndirfd, new_name);
1127     if (ret < 0) {
1128         goto out;
1129     }
1130
1131     if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1132         int omap_dirfd, nmap_dirfd;
1133
1134         ret = mkdirat(ndirfd, VIRTFS_META_DIR, 0700);
1135         if (ret < 0 && errno != EEXIST) {
1136             goto err_undo_rename;
1137         }
1138
1139         omap_dirfd = openat_dir(odirfd, VIRTFS_META_DIR);
1140         if (omap_dirfd == -1) {
1141             goto err;
1142         }
1143
1144         nmap_dirfd = openat_dir(ndirfd, VIRTFS_META_DIR);
1145         if (nmap_dirfd == -1) {
1146             close_preserve_errno(omap_dirfd);
1147             goto err;
1148         }
1149
1150         /* rename the .virtfs_metadata files */
1151         ret = renameat(omap_dirfd, old_name, nmap_dirfd, new_name);
1152         close_preserve_errno(nmap_dirfd);
1153         close_preserve_errno(omap_dirfd);
1154         if (ret < 0 && errno != ENOENT) {
1155             goto err_undo_rename;
1156         }
1157
1158         ret = 0;
1159     }
1160     goto out;
1161
1162 err:
1163     ret = -1;
1164 err_undo_rename:
1165     renameat_preserve_errno(ndirfd, new_name, odirfd, old_name);
1166 out:
1167     close_preserve_errno(ndirfd);
1168     close_preserve_errno(odirfd);
1169     return ret;
1170 }
1171
1172 static void v9fs_path_init_dirname(V9fsPath *path, const char *str)
1173 {
1174     path->data = g_path_get_dirname(str);
1175     path->size = strlen(path->data) + 1;
1176 }
1177
1178 static int local_rename(FsContext *ctx, const char *oldpath,
1179                         const char *newpath)
1180 {
1181     int err;
1182     char *oname = g_path_get_basename(oldpath);
1183     char *nname = g_path_get_basename(newpath);
1184     V9fsPath olddir, newdir;
1185
1186     v9fs_path_init_dirname(&olddir, oldpath);
1187     v9fs_path_init_dirname(&newdir, newpath);
1188
1189     err = local_renameat(ctx, &olddir, oname, &newdir, nname);
1190
1191     v9fs_path_free(&newdir);
1192     v9fs_path_free(&olddir);
1193     g_free(nname);
1194     g_free(oname);
1195
1196     return err;
1197 }
1198
1199 static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
1200                           const char *name, int flags)
1201 {
1202     int ret;
1203     int dirfd;
1204
1205     dirfd = local_opendir_nofollow(ctx, dir->data);
1206     if (dirfd == -1) {
1207         return -1;
1208     }
1209
1210     ret = local_unlinkat_common(ctx, dirfd, name, flags);
1211     close_preserve_errno(dirfd);
1212     return ret;
1213 }
1214
1215 static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
1216                                 mode_t st_mode, uint64_t *st_gen)
1217 {
1218 #ifdef FS_IOC_GETVERSION
1219     int err;
1220     V9fsFidOpenState fid_open;
1221
1222     /*
1223      * Do not try to open special files like device nodes, fifos etc
1224      * We can get fd for regular files and directories only
1225      */
1226     if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
1227         errno = ENOTTY;
1228         return -1;
1229     }
1230     err = local_open(ctx, path, O_RDONLY, &fid_open);
1231     if (err < 0) {
1232         return err;
1233     }
1234     err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
1235     local_close(ctx, &fid_open);
1236     return err;
1237 #else
1238     errno = ENOTTY;
1239     return -1;
1240 #endif
1241 }
1242
1243 static int local_init(FsContext *ctx)
1244 {
1245     struct statfs stbuf;
1246     LocalData *data = g_malloc(sizeof(*data));
1247
1248     data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY);
1249     if (data->mountfd == -1) {
1250         goto err;
1251     }
1252
1253 #ifdef FS_IOC_GETVERSION
1254     /*
1255      * use ioc_getversion only if the ioctl is definied
1256      */
1257     if (fstatfs(data->mountfd, &stbuf) < 0) {
1258         close_preserve_errno(data->mountfd);
1259         goto err;
1260     }
1261     switch (stbuf.f_type) {
1262     case EXT2_SUPER_MAGIC:
1263     case BTRFS_SUPER_MAGIC:
1264     case REISERFS_SUPER_MAGIC:
1265     case XFS_SUPER_MAGIC:
1266         ctx->exops.get_st_gen = local_ioc_getversion;
1267         break;
1268     }
1269 #endif
1270
1271     if (ctx->export_flags & V9FS_SM_PASSTHROUGH) {
1272         ctx->xops = passthrough_xattr_ops;
1273     } else if (ctx->export_flags & V9FS_SM_MAPPED) {
1274         ctx->xops = mapped_xattr_ops;
1275     } else if (ctx->export_flags & V9FS_SM_NONE) {
1276         ctx->xops = none_xattr_ops;
1277     } else if (ctx->export_flags & V9FS_SM_MAPPED_FILE) {
1278         /*
1279          * xattr operation for mapped-file and passthrough
1280          * remain same.
1281          */
1282         ctx->xops = passthrough_xattr_ops;
1283     }
1284     ctx->export_flags |= V9FS_PATHNAME_FSCONTEXT;
1285
1286     ctx->private = data;
1287     return 0;
1288
1289 err:
1290     g_free(data);
1291     return -1;
1292 }
1293
1294 static void local_cleanup(FsContext *ctx)
1295 {
1296     LocalData *data = ctx->private;
1297
1298     close(data->mountfd);
1299     g_free(data);
1300 }
1301
1302 static int local_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
1303 {
1304     const char *sec_model = qemu_opt_get(opts, "security_model");
1305     const char *path = qemu_opt_get(opts, "path");
1306     Error *err = NULL;
1307
1308     if (!sec_model) {
1309         error_report("Security model not specified, local fs needs security model");
1310         error_printf("valid options are:"
1311                      "\tsecurity_model=[passthrough|mapped-xattr|mapped-file|none]\n");
1312         return -1;
1313     }
1314
1315     if (!strcmp(sec_model, "passthrough")) {
1316         fse->export_flags |= V9FS_SM_PASSTHROUGH;
1317     } else if (!strcmp(sec_model, "mapped") ||
1318                !strcmp(sec_model, "mapped-xattr")) {
1319         fse->export_flags |= V9FS_SM_MAPPED;
1320     } else if (!strcmp(sec_model, "none")) {
1321         fse->export_flags |= V9FS_SM_NONE;
1322     } else if (!strcmp(sec_model, "mapped-file")) {
1323         fse->export_flags |= V9FS_SM_MAPPED_FILE;
1324     } else {
1325         error_report("Invalid security model %s specified", sec_model);
1326         error_printf("valid options are:"
1327                      "\t[passthrough|mapped-xattr|mapped-file|none]\n");
1328         return -1;
1329     }
1330
1331     if (!path) {
1332         error_report("fsdev: No path specified");
1333         return -1;
1334     }
1335
1336     fsdev_throttle_parse_opts(opts, &fse->fst, &err);
1337     if (err) {
1338         error_reportf_err(err, "Throttle configuration is not valid: ");
1339         return -1;
1340     }
1341
1342     fse->path = g_strdup(path);
1343
1344     return 0;
1345 }
1346
1347 FileOperations local_ops = {
1348     .parse_opts = local_parse_opts,
1349     .init  = local_init,
1350     .cleanup = local_cleanup,
1351     .lstat = local_lstat,
1352     .readlink = local_readlink,
1353     .close = local_close,
1354     .closedir = local_closedir,
1355     .open = local_open,
1356     .opendir = local_opendir,
1357     .rewinddir = local_rewinddir,
1358     .telldir = local_telldir,
1359     .readdir = local_readdir,
1360     .seekdir = local_seekdir,
1361     .preadv = local_preadv,
1362     .pwritev = local_pwritev,
1363     .chmod = local_chmod,
1364     .mknod = local_mknod,
1365     .mkdir = local_mkdir,
1366     .fstat = local_fstat,
1367     .open2 = local_open2,
1368     .symlink = local_symlink,
1369     .link = local_link,
1370     .truncate = local_truncate,
1371     .rename = local_rename,
1372     .chown = local_chown,
1373     .utimensat = local_utimensat,
1374     .remove = local_remove,
1375     .fsync = local_fsync,
1376     .statfs = local_statfs,
1377     .lgetxattr = local_lgetxattr,
1378     .llistxattr = local_llistxattr,
1379     .lsetxattr = local_lsetxattr,
1380     .lremovexattr = local_lremovexattr,
1381     .name_to_path = local_name_to_path,
1382     .renameat  = local_renameat,
1383     .unlinkat = local_unlinkat,
1384 };