hw/9pfs/9p-handle.c

   1 /*
   2  * 9p handle callback
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *    Aneesh Kumar K.V <aneesh.kumar@linux.vnet.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-xattr.h"
  17 #include <arpa/inet.h>
  18 #include <pwd.h>
  19 #include <grp.h>
  20 #include <sys/socket.h>
  21 #include <sys/un.h>
  22 #include "qemu/xattr.h"
  23 #include "qemu/cutils.h"
  24 #include "qemu/error-report.h"
  25 #include <linux/fs.h>
  26 #ifdef CONFIG_LINUX_MAGIC_H
  27 #include <linux/magic.h>
  28 #endif
  29 #include <sys/ioctl.h>
  30
  31 #ifndef XFS_SUPER_MAGIC
  32 #define XFS_SUPER_MAGIC  0x58465342
  33 #endif
  34 #ifndef EXT2_SUPER_MAGIC
  35 #define EXT2_SUPER_MAGIC 0xEF53
  36 #endif
  37 #ifndef REISERFS_SUPER_MAGIC
  38 #define REISERFS_SUPER_MAGIC 0x52654973
  39 #endif
  40 #ifndef BTRFS_SUPER_MAGIC
  41 #define BTRFS_SUPER_MAGIC 0x9123683E
  42 #endif
  43
  44 struct handle_data {
  45     int mountfd;
  46     int handle_bytes;
  47 };
  48
  49 static inline int name_to_handle(int dirfd, const char *name,
  50                                  struct file_handle *fh, int *mnt_id, int flags)
  51 {
  52     return name_to_handle_at(dirfd, name, fh, mnt_id, flags);
  53 }
  54
  55 static inline int open_by_handle(int mountfd, const char *fh, int flags)
  56 {
  57     return open_by_handle_at(mountfd, (struct file_handle *)fh, flags);
  58 }
  59
  60 static int handle_update_file_cred(int dirfd, const char *name, FsCred *credp)
  61 {
  62     int fd, ret;
  63     fd = openat(dirfd, name, O_NONBLOCK | O_NOFOLLOW);
  64     if (fd < 0) {
  65         return fd;
  66     }
  67     ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
  68     if (ret < 0) {
  69         goto err_out;
  70     }
  71     ret = fchmod(fd, credp->fc_mode & 07777);
  72 err_out:
  73     close(fd);
  74     return ret;
  75 }
  76
  77
  78 static int handle_lstat(FsContext *fs_ctx, V9fsPath *fs_path,
  79                         struct stat *stbuf)
  80 {
  81     int fd, ret;
  82     struct handle_data *data = (struct handle_data *)fs_ctx->private;
  83
  84     fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
  85     if (fd < 0) {
  86         return fd;
  87     }
  88     ret = fstatat(fd, "", stbuf, AT_EMPTY_PATH);
  89     close(fd);
  90     return ret;
  91 }
  92
  93 static ssize_t handle_readlink(FsContext *fs_ctx, V9fsPath *fs_path,
  94                                char *buf, size_t bufsz)
  95 {
  96     int fd, ret;
  97     struct handle_data *data = (struct handle_data *)fs_ctx->private;
  98
  99     fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
 100     if (fd < 0) {
 101         return fd;
 102     }
 103     ret = readlinkat(fd, "", buf, bufsz);
 104     close(fd);
 105     return ret;
 106 }
 107
 108 static int handle_close(FsContext *ctx, V9fsFidOpenState *fs)
 109 {
 110     return close(fs->fd);
 111 }
 112
 113 static int handle_closedir(FsContext *ctx, V9fsFidOpenState *fs)
 114 {
 115     return closedir(fs->dir.stream);
 116 }
 117
 118 static int handle_open(FsContext *ctx, V9fsPath *fs_path,
 119                        int flags, V9fsFidOpenState *fs)
 120 {
 121     struct handle_data *data = (struct handle_data *)ctx->private;
 122
 123     fs->fd = open_by_handle(data->mountfd, fs_path->data, flags);
 124     return fs->fd;
 125 }
 126
 127 static int handle_opendir(FsContext *ctx,
 128                           V9fsPath *fs_path, V9fsFidOpenState *fs)
 129 {
 130     int ret;
 131     ret = handle_open(ctx, fs_path, O_DIRECTORY, fs);
 132     if (ret < 0) {
 133         return -1;
 134     }
 135     fs->dir.stream = fdopendir(ret);
 136     if (!fs->dir.stream) {
 137         return -1;
 138     }
 139     return 0;
 140 }
 141
 142 static void handle_rewinddir(FsContext *ctx, V9fsFidOpenState *fs)
 143 {
 144     rewinddir(fs->dir.stream);
 145 }
 146
 147 static off_t handle_telldir(FsContext *ctx, V9fsFidOpenState *fs)
 148 {
 149     return telldir(fs->dir.stream);
 150 }
 151
 152 static struct dirent *handle_readdir(FsContext *ctx, V9fsFidOpenState *fs)
 153 {
 154     return readdir(fs->dir.stream);
 155 }
 156
 157 static void handle_seekdir(FsContext *ctx, V9fsFidOpenState *fs, off_t off)
 158 {
 159     seekdir(fs->dir.stream, off);
 160 }
 161
 162 static ssize_t handle_preadv(FsContext *ctx, V9fsFidOpenState *fs,
 163                              const struct iovec *iov,
 164                              int iovcnt, off_t offset)
 165 {
 166 #ifdef CONFIG_PREADV
 167     return preadv(fs->fd, iov, iovcnt, offset);
 168 #else
 169     int err = lseek(fs->fd, offset, SEEK_SET);
 170     if (err == -1) {
 171         return err;
 172     } else {
 173         return readv(fs->fd, iov, iovcnt);
 174     }
 175 #endif
 176 }
 177
 178 static ssize_t handle_pwritev(FsContext *ctx, V9fsFidOpenState *fs,
 179                               const struct iovec *iov,
 180                               int iovcnt, off_t offset)
 181 {
 182     ssize_t ret;
 183 #ifdef CONFIG_PREADV
 184     ret = pwritev(fs->fd, iov, iovcnt, offset);
 185 #else
 186     int err = lseek(fs->fd, offset, SEEK_SET);
 187     if (err == -1) {
 188         return err;
 189     } else {
 190         ret = writev(fs->fd, iov, iovcnt);
 191     }
 192 #endif
 193 #ifdef CONFIG_SYNC_FILE_RANGE
 194     if (ret > 0 && ctx->export_flags & V9FS_IMMEDIATE_WRITEOUT) {
 195         /*
 196          * Initiate a writeback. This is not a data integrity sync.
 197          * We want to ensure that we don't leave dirty pages in the cache
 198          * after write when writeout=immediate is sepcified.
 199          */
 200         sync_file_range(fs->fd, offset, ret,
 201                         SYNC_FILE_RANGE_WAIT_BEFORE | SYNC_FILE_RANGE_WRITE);
 202     }
 203 #endif
 204     return ret;
 205 }
 206
 207 static int handle_chmod(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 208 {
 209     int fd, ret;
 210     struct handle_data *data = (struct handle_data *)fs_ctx->private;
 211
 212     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 213     if (fd < 0) {
 214         return fd;
 215     }
 216     ret = fchmod(fd, credp->fc_mode);
 217     close(fd);
 218     return ret;
 219 }
 220
 221 static int handle_mknod(FsContext *fs_ctx, V9fsPath *dir_path,
 222                        const char *name, FsCred *credp)
 223 {
 224     int dirfd, ret;
 225     struct handle_data *data = (struct handle_data *)fs_ctx->private;
 226
 227     dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
 228     if (dirfd < 0) {
 229         return dirfd;
 230     }
 231     ret = mknodat(dirfd, name, credp->fc_mode, credp->fc_rdev);
 232     if (!ret) {
 233         ret = handle_update_file_cred(dirfd, name, credp);
 234     }
 235     close(dirfd);
 236     return ret;
 237 }
 238
 239 static int handle_mkdir(FsContext *fs_ctx, V9fsPath *dir_path,
 240                        const char *name, FsCred *credp)
 241 {
 242     int dirfd, ret;
 243     struct handle_data *data = (struct handle_data *)fs_ctx->private;
 244
 245     dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
 246     if (dirfd < 0) {
 247         return dirfd;
 248     }
 249     ret = mkdirat(dirfd, name, credp->fc_mode);
 250     if (!ret) {
 251         ret = handle_update_file_cred(dirfd, name, credp);
 252     }
 253     close(dirfd);
 254     return ret;
 255 }
 256
 257 static int handle_fstat(FsContext *fs_ctx, int fid_type,
 258                         V9fsFidOpenState *fs, struct stat *stbuf)
 259 {
 260     int fd;
 261
 262     if (fid_type == P9_FID_DIR) {
 263         fd = dirfd(fs->dir.stream);
 264     } else {
 265         fd = fs->fd;
 266     }
 267     return fstat(fd, stbuf);
 268 }
 269
 270 static int handle_open2(FsContext *fs_ctx, V9fsPath *dir_path, const char *name,
 271                         int flags, FsCred *credp, V9fsFidOpenState *fs)
 272 {
 273     int ret;
 274     int dirfd, fd;
 275     struct handle_data *data = (struct handle_data *)fs_ctx->private;
 276
 277     dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
 278     if (dirfd < 0) {
 279         return dirfd;
 280     }
 281     fd = openat(dirfd, name, flags | O_NOFOLLOW, credp->fc_mode);
 282     if (fd >= 0) {
 283         ret = handle_update_file_cred(dirfd, name, credp);
 284         if (ret < 0) {
 285             close(fd);
 286             fd = ret;
 287         } else {
 288             fs->fd = fd;
 289         }
 290     }
 291     close(dirfd);
 292     return fd;
 293 }
 294
 295
 296 static int handle_symlink(FsContext *fs_ctx, const char *oldpath,
 297                           V9fsPath *dir_path, const char *name, FsCred *credp)
 298 {
 299     int fd, dirfd, ret;
 300     struct handle_data *data = (struct handle_data *)fs_ctx->private;
 301
 302     dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
 303     if (dirfd < 0) {
 304         return dirfd;
 305     }
 306     ret = symlinkat(oldpath, dirfd, name);
 307     if (!ret) {
 308         fd = openat(dirfd, name, O_PATH | O_NOFOLLOW);
 309         if (fd < 0) {
 310             ret = fd;
 311             goto err_out;
 312         }
 313         ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
 314         close(fd);
 315     }
 316 err_out:
 317     close(dirfd);
 318     return ret;
 319 }
 320
 321 static int handle_link(FsContext *ctx, V9fsPath *oldpath,
 322                        V9fsPath *dirpath, const char *name)
 323 {
 324     int oldfd, newdirfd, ret;
 325     struct handle_data *data = (struct handle_data *)ctx->private;
 326
 327     oldfd = open_by_handle(data->mountfd, oldpath->data, O_PATH);
 328     if (oldfd < 0) {
 329         return oldfd;
 330     }
 331     newdirfd = open_by_handle(data->mountfd, dirpath->data, O_PATH);
 332     if (newdirfd < 0) {
 333         close(oldfd);
 334         return newdirfd;
 335     }
 336     ret = linkat(oldfd, "", newdirfd, name, AT_EMPTY_PATH);
 337     close(newdirfd);
 338     close(oldfd);
 339     return ret;
 340 }
 341
 342 static int handle_truncate(FsContext *ctx, V9fsPath *fs_path, off_t size)
 343 {
 344     int fd, ret;
 345     struct handle_data *data = (struct handle_data *)ctx->private;
 346
 347     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK | O_WRONLY);
 348     if (fd < 0) {
 349         return fd;
 350     }
 351     ret = ftruncate(fd, size);
 352     close(fd);
 353     return ret;
 354 }
 355
 356 static int handle_rename(FsContext *ctx, const char *oldpath,
 357                          const char *newpath)
 358 {
 359     errno = EOPNOTSUPP;
 360     return -1;
 361 }
 362
 363 static int handle_chown(FsContext *fs_ctx, V9fsPath *fs_path, FsCred *credp)
 364 {
 365     int fd, ret;
 366     struct handle_data *data = (struct handle_data *)fs_ctx->private;
 367
 368     fd = open_by_handle(data->mountfd, fs_path->data, O_PATH);
 369     if (fd < 0) {
 370         return fd;
 371     }
 372     ret = fchownat(fd, "", credp->fc_uid, credp->fc_gid, AT_EMPTY_PATH);
 373     close(fd);
 374     return ret;
 375 }
 376
 377 static int handle_utimensat(FsContext *ctx, V9fsPath *fs_path,
 378                             const struct timespec *buf)
 379 {
 380     int ret;
 381     int fd;
 382     struct handle_data *data = (struct handle_data *)ctx->private;
 383
 384     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 385     if (fd < 0) {
 386         return fd;
 387     }
 388     ret = futimens(fd, buf);
 389     close(fd);
 390     return ret;
 391 }
 392
 393 static int handle_remove(FsContext *ctx, const char *path)
 394 {
 395     errno = EOPNOTSUPP;
 396     return -1;
 397 }
 398
 399 static int handle_fsync(FsContext *ctx, int fid_type,
 400                         V9fsFidOpenState *fs, int datasync)
 401 {
 402     int fd;
 403
 404     if (fid_type == P9_FID_DIR) {
 405         fd = dirfd(fs->dir.stream);
 406     } else {
 407         fd = fs->fd;
 408     }
 409
 410     if (datasync) {
 411         return qemu_fdatasync(fd);
 412     } else {
 413         return fsync(fd);
 414     }
 415 }
 416
 417 static int handle_statfs(FsContext *ctx, V9fsPath *fs_path,
 418                          struct statfs *stbuf)
 419 {
 420     int fd, ret;
 421     struct handle_data *data = (struct handle_data *)ctx->private;
 422
 423     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 424     if (fd < 0) {
 425         return fd;
 426     }
 427     ret = fstatfs(fd, stbuf);
 428     close(fd);
 429     return ret;
 430 }
 431
 432 static ssize_t handle_lgetxattr(FsContext *ctx, V9fsPath *fs_path,
 433                                 const char *name, void *value, size_t size)
 434 {
 435     int fd, ret;
 436     struct handle_data *data = (struct handle_data *)ctx->private;
 437
 438     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 439     if (fd < 0) {
 440         return fd;
 441     }
 442     ret = fgetxattr(fd, name, value, size);
 443     close(fd);
 444     return ret;
 445 }
 446
 447 static ssize_t handle_llistxattr(FsContext *ctx, V9fsPath *fs_path,
 448                                  void *value, size_t size)
 449 {
 450     int fd, ret;
 451     struct handle_data *data = (struct handle_data *)ctx->private;
 452
 453     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 454     if (fd < 0) {
 455         return fd;
 456     }
 457     ret = flistxattr(fd, value, size);
 458     close(fd);
 459     return ret;
 460 }
 461
 462 static int handle_lsetxattr(FsContext *ctx, V9fsPath *fs_path, const char *name,
 463                             void *value, size_t size, int flags)
 464 {
 465     int fd, ret;
 466     struct handle_data *data = (struct handle_data *)ctx->private;
 467
 468     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 469     if (fd < 0) {
 470         return fd;
 471     }
 472     ret = fsetxattr(fd, name, value, size, flags);
 473     close(fd);
 474     return ret;
 475 }
 476
 477 static int handle_lremovexattr(FsContext *ctx, V9fsPath *fs_path,
 478                                const char *name)
 479 {
 480     int fd, ret;
 481     struct handle_data *data = (struct handle_data *)ctx->private;
 482
 483     fd = open_by_handle(data->mountfd, fs_path->data, O_NONBLOCK);
 484     if (fd < 0) {
 485         return fd;
 486     }
 487     ret = fremovexattr(fd, name);
 488     close(fd);
 489     return ret;
 490 }
 491
 492 static int handle_name_to_path(FsContext *ctx, V9fsPath *dir_path,
 493                               const char *name, V9fsPath *target)
 494 {
 495     char *buffer;
 496     struct file_handle *fh;
 497     int dirfd, ret, mnt_id;
 498     struct handle_data *data = (struct handle_data *)ctx->private;
 499
 500     /* "." and ".." are not allowed */
 501     if (!strcmp(name, ".") || !strcmp(name, "..")) {
 502         errno = EINVAL;
 503         return -1;
 504
 505     }
 506     if (dir_path) {
 507         dirfd = open_by_handle(data->mountfd, dir_path->data, O_PATH);
 508     } else {
 509         /* relative to export root */
 510         buffer = rpath(ctx, ".");
 511         dirfd = open(buffer, O_DIRECTORY);
 512         g_free(buffer);
 513     }
 514     if (dirfd < 0) {
 515         return dirfd;
 516     }
 517     fh = g_malloc(sizeof(struct file_handle) + data->handle_bytes);
 518     fh->handle_bytes = data->handle_bytes;
 519     /* add a "./" at the beginning of the path */
 520     buffer = g_strdup_printf("./%s", name);
 521     /* flag = 0 imply don't follow symlink */
 522     ret = name_to_handle(dirfd, buffer, fh, &mnt_id, 0);
 523     if (!ret) {
 524         target->data = (char *)fh;
 525         target->size = sizeof(struct file_handle) + data->handle_bytes;
 526     } else {
 527         g_free(fh);
 528     }
 529     close(dirfd);
 530     g_free(buffer);
 531     return ret;
 532 }
 533
 534 static int handle_renameat(FsContext *ctx, V9fsPath *olddir,
 535                            const char *old_name, V9fsPath *newdir,
 536                            const char *new_name)
 537 {
 538     int olddirfd, newdirfd, ret;
 539     struct handle_data *data = (struct handle_data *)ctx->private;
 540
 541     olddirfd = open_by_handle(data->mountfd, olddir->data, O_PATH);
 542     if (olddirfd < 0) {
 543         return olddirfd;
 544     }
 545     newdirfd = open_by_handle(data->mountfd, newdir->data, O_PATH);
 546     if (newdirfd < 0) {
 547         close(olddirfd);
 548         return newdirfd;
 549     }
 550     ret = renameat(olddirfd, old_name, newdirfd, new_name);
 551     close(newdirfd);
 552     close(olddirfd);
 553     return ret;
 554 }
 555
 556 static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
 557                            const char *name, int flags)
 558 {
 559     int dirfd, ret;
 560     struct handle_data *data = (struct handle_data *)ctx->private;
 561     int rflags;
 562
 563     dirfd = open_by_handle(data->mountfd, dir->data, O_PATH);
 564     if (dirfd < 0) {
 565         return dirfd;
 566     }
 567
 568     rflags = 0;
 569     if (flags & P9_DOTL_AT_REMOVEDIR) {
 570         rflags |= AT_REMOVEDIR;
 571     }
 572
 573     ret = unlinkat(dirfd, name, rflags);
 574
 575     close(dirfd);
 576     return ret;
 577 }
 578
 579 static int handle_ioc_getversion(FsContext *ctx, V9fsPath *path,
 580                                  mode_t st_mode, uint64_t *st_gen)
 581 {
 582 #ifdef FS_IOC_GETVERSION
 583     int err;
 584     V9fsFidOpenState fid_open;
 585
 586     /*
 587      * Do not try to open special files like device nodes, fifos etc
 588      * We can get fd for regular files and directories only
 589      */
 590     if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
 591         errno = ENOTTY;
 592         return -1;
 593     }
 594     err = handle_open(ctx, path, O_RDONLY, &fid_open);
 595     if (err < 0) {
 596         return err;
 597     }
 598     err = ioctl(fid_open.fd, FS_IOC_GETVERSION, st_gen);
 599     handle_close(ctx, &fid_open);
 600     return err;
 601 #else
 602     errno = ENOTTY;
 603     return -1;
 604 #endif
 605 }
 606
 607 static int handle_init(FsContext *ctx)
 608 {
 609     int ret, mnt_id;
 610     struct statfs stbuf;
 611     struct file_handle fh;
 612     struct handle_data *data = g_malloc(sizeof(struct handle_data));
 613
 614     data->mountfd = open(ctx->fs_root, O_DIRECTORY);
 615     if (data->mountfd < 0) {
 616         ret = data->mountfd;
 617         goto err_out;
 618     }
 619     ret = statfs(ctx->fs_root, &stbuf);
 620     if (!ret) {
 621         switch (stbuf.f_type) {
 622         case EXT2_SUPER_MAGIC:
 623         case BTRFS_SUPER_MAGIC:
 624         case REISERFS_SUPER_MAGIC:
 625         case XFS_SUPER_MAGIC:
 626             ctx->exops.get_st_gen = handle_ioc_getversion;
 627             break;
 628         }
 629     }
 630     memset(&fh, 0, sizeof(struct file_handle));
 631     ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0);
 632     if (ret && errno == EOVERFLOW) {
 633         data->handle_bytes = fh.handle_bytes;
 634         ctx->private = data;
 635         ret = 0;
 636         goto out;
 637     }
 638     /* we got 0 byte handle ? */
 639     ret = -1;
 640     close(data->mountfd);
 641 err_out:
 642     g_free(data);
 643 out:
 644     return ret;
 645 }
 646
 647 static void handle_cleanup(FsContext *ctx)
 648 {
 649     struct handle_data *data = ctx->private;
 650
 651     close(data->mountfd);
 652     g_free(data);
 653 }
 654
 655 static int handle_parse_opts(QemuOpts *opts, struct FsDriverEntry *fse)
 656 {
 657     const char *sec_model = qemu_opt_get(opts, "security_model");
 658     const char *path = qemu_opt_get(opts, "path");
 659
 660     if (sec_model) {
 661         error_report("Invalid argument security_model specified with handle fsdriver");
 662         return -1;
 663     }
 664
 665     if (!path) {
 666         error_report("fsdev: No path specified");
 667         return -1;
 668     }
 669     fse->path = g_strdup(path);
 670     return 0;
 671
 672 }
 673
 674 FileOperations handle_ops = {
 675     .parse_opts   = handle_parse_opts,
 676     .init         = handle_init,
 677     .cleanup      = handle_cleanup,
 678     .lstat        = handle_lstat,
 679     .readlink     = handle_readlink,
 680     .close        = handle_close,
 681     .closedir     = handle_closedir,
 682     .open         = handle_open,
 683     .opendir      = handle_opendir,
 684     .rewinddir    = handle_rewinddir,
 685     .telldir      = handle_telldir,
 686     .readdir      = handle_readdir,
 687     .seekdir      = handle_seekdir,
 688     .preadv       = handle_preadv,
 689     .pwritev      = handle_pwritev,
 690     .chmod        = handle_chmod,
 691     .mknod        = handle_mknod,
 692     .mkdir        = handle_mkdir,
 693     .fstat        = handle_fstat,
 694     .open2        = handle_open2,
 695     .symlink      = handle_symlink,
 696     .link         = handle_link,
 697     .truncate     = handle_truncate,
 698     .rename       = handle_rename,
 699     .chown        = handle_chown,
 700     .utimensat    = handle_utimensat,
 701     .remove       = handle_remove,
 702     .fsync        = handle_fsync,
 703     .statfs       = handle_statfs,
 704     .lgetxattr    = handle_lgetxattr,
 705     .llistxattr   = handle_llistxattr,
 706     .lsetxattr    = handle_lsetxattr,
 707     .lremovexattr = handle_lremovexattr,
 708     .name_to_path = handle_name_to_path,
 709     .renameat     = handle_renameat,
 710     .unlinkat     = handle_unlinkat,
 711 };