1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are 9 * met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above 14 * copyright notice, this list of conditions and the following disclaimer 15 * in the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Google Inc. nor the names of its 18 * contributors may be used to endorse or promote products derived from 19 * this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 * Copyright (C) 2005 Csaba Henk. 34 * All rights reserved. 35 * 36 * Copyright (c) 2019 The FreeBSD Foundation 37 * 38 * Portions of this software were developed by BFF Storage Systems, LLC under 39 * sponsorship from the FreeBSD Foundation. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 50 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 */ 62 63 #include <sys/param.h> 64 #include <sys/buf.h> 65 #include <sys/module.h> 66 #include <sys/systm.h> 67 #include <sys/errno.h> 68 #include <sys/kernel.h> 69 #include <sys/capsicum.h> 70 #include <sys/conf.h> 71 #include <sys/filedesc.h> 72 #include <sys/uio.h> 73 #include <sys/malloc.h> 74 #include <sys/queue.h> 75 #include <sys/lock.h> 76 #include <sys/sx.h> 77 #include <sys/mutex.h> 78 #include <sys/proc.h> 79 #include <sys/vnode.h> 80 #include <sys/namei.h> 81 #include <sys/mount.h> 82 #include <sys/sysctl.h> 83 #include <sys/fcntl.h> 84 #define EXTERR_CATEGORY EXTERR_CAT_FUSE_VFS 85 #include <sys/exterrvar.h> 86 87 #include "fuse.h" 88 #include "fuse_node.h" 89 #include "fuse_ipc.h" 90 #include "fuse_internal.h" 91 92 #include <sys/priv.h> 93 #include <security/mac/mac_framework.h> 94 95 SDT_PROVIDER_DECLARE(fusefs); 96 /* 97 * Fuse trace probe: 98 * arg0: verbosity. Higher numbers give more verbose messages 99 * arg1: Textual message 100 */ 101 SDT_PROBE_DEFINE2(fusefs, , vfsops, trace, "int", "char*"); 102 103 /* This will do for privilege types for now */ 104 #ifndef PRIV_VFS_FUSE_ALLOWOTHER 105 #define PRIV_VFS_FUSE_ALLOWOTHER PRIV_VFS_MOUNT_NONUSER 106 #endif 107 #ifndef PRIV_VFS_FUSE_MOUNT_NONUSER 108 #define PRIV_VFS_FUSE_MOUNT_NONUSER PRIV_VFS_MOUNT_NONUSER 109 #endif 110 #ifndef PRIV_VFS_FUSE_SYNC_UNMOUNT 111 #define PRIV_VFS_FUSE_SYNC_UNMOUNT PRIV_VFS_MOUNT_NONUSER 112 #endif 113 114 static vfs_fhtovp_t fuse_vfsop_fhtovp; 115 static vfs_mount_t fuse_vfsop_mount; 116 static vfs_unmount_t fuse_vfsop_unmount; 117 static vfs_root_t fuse_vfsop_root; 118 static vfs_statfs_t fuse_vfsop_statfs; 119 static vfs_vget_t fuse_vfsop_vget; 120 121 struct vfsops fuse_vfsops = { 122 .vfs_fhtovp = fuse_vfsop_fhtovp, 123 .vfs_mount = fuse_vfsop_mount, 124 .vfs_unmount = fuse_vfsop_unmount, 125 .vfs_root = fuse_vfsop_root, 126 .vfs_statfs = fuse_vfsop_statfs, 127 .vfs_vget = fuse_vfsop_vget, 128 }; 129 130 static int fuse_enforce_dev_perms = 0; 131 132 SYSCTL_INT(_vfs_fusefs, OID_AUTO, enforce_dev_perms, CTLFLAG_RW, 133 &fuse_enforce_dev_perms, 0, 134 "enforce fuse device permissions for secondary mounts"); 135 136 MALLOC_DEFINE(M_FUSEVFS, "fuse_filesystem", "buffer for fuse vfs layer"); 137 138 static int 139 fuse_getdevice(const char *fspec, struct thread *td, struct cdev **fdevp) 140 { 141 struct nameidata nd, *ndp = &nd; 142 struct vnode *devvp; 143 struct cdev *fdev; 144 int err; 145 146 /* 147 * Not an update, or updating the name: look up the name 148 * and verify that it refers to a sensible disk device. 149 */ 150 151 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec); 152 if ((err = namei(ndp)) != 0) 153 return err; 154 NDFREE_PNBUF(ndp); 155 devvp = ndp->ni_vp; 156 157 if (devvp->v_type != VCHR) { 158 vrele(devvp); 159 return ENXIO; 160 } 161 fdev = devvp->v_rdev; 162 dev_ref(fdev); 163 164 if (fuse_enforce_dev_perms) { 165 /* 166 * Check if mounter can open the fuse device. 167 * 168 * This has significance only if we are doing a secondary mount 169 * which doesn't involve actually opening fuse devices, but we 170 * still want to enforce the permissions of the device (in 171 * order to keep control over the circle of fuse users). 172 * 173 * (In case of primary mounts, we are either the superuser so 174 * we can do anything anyway, or we can mount only if the 175 * device is already opened by us, ie. we are permitted to open 176 * the device.) 177 */ 178 #if 0 179 #ifdef MAC 180 err = mac_check_vnode_open(td->td_ucred, devvp, VREAD | VWRITE); 181 if (!err) 182 #endif 183 #endif /* 0 */ 184 err = VOP_ACCESS(devvp, VREAD | VWRITE, td->td_ucred, td); 185 if (err) { 186 vrele(devvp); 187 dev_rel(fdev); 188 return err; 189 } 190 } 191 /* 192 * according to coda code, no extra lock is needed -- 193 * although in sys/vnode.h this field is marked "v" 194 */ 195 vrele(devvp); 196 197 if (!fdev->si_devsw || 198 strcmp("fuse", fdev->si_devsw->d_name)) { 199 dev_rel(fdev); 200 return ENXIO; 201 } 202 *fdevp = fdev; 203 204 return 0; 205 } 206 207 #define FUSE_FLAGOPT(fnam, fval) do { \ 208 vfs_flagopt(opts, #fnam, &mntopts, fval); \ 209 vfs_flagopt(opts, "__" #fnam, &__mntopts, fval); \ 210 } while (0) 211 212 SDT_PROBE_DEFINE1(fusefs, , vfsops, mntopts, "uint64_t"); 213 SDT_PROBE_DEFINE4(fusefs, , vfsops, mount_err, "char*", "struct fuse_data*", 214 "struct mount*", "int"); 215 216 static int 217 fuse_vfs_remount(struct mount *mp, struct thread *td, uint64_t mntopts, 218 uint32_t max_read, int daemon_timeout) 219 { 220 int err = 0; 221 struct fuse_data *data = fuse_get_mpdata(mp); 222 /* Don't allow these options to be changed */ 223 const static unsigned long long cant_update_opts = 224 MNT_USER; /* Mount owner must be the user running the daemon */ 225 226 FUSE_LOCK(); 227 228 if ((mp->mnt_flag ^ data->mnt_flag) & cant_update_opts) { 229 err = EOPNOTSUPP; 230 SDT_PROBE4(fusefs, , vfsops, mount_err, 231 "Can't change these mount options during remount", 232 data, mp, err); 233 goto out; 234 } 235 if (((data->dataflags ^ mntopts) & FSESS_MNTOPTS_MASK) || 236 (data->max_read != max_read) || 237 (data->daemon_timeout != daemon_timeout)) { 238 // TODO: allow changing options where it makes sense 239 err = EOPNOTSUPP; 240 SDT_PROBE4(fusefs, , vfsops, mount_err, 241 "Can't change fuse mount options during remount", 242 data, mp, err); 243 goto out; 244 } 245 246 if (fdata_get_dead(data)) { 247 err = ENOTCONN; 248 SDT_PROBE4(fusefs, , vfsops, mount_err, 249 "device is dead during mount", data, mp, err); 250 goto out; 251 } 252 253 /* Sanity + permission checks */ 254 if (!data->daemoncred) 255 panic("fuse daemon found, but identity unknown"); 256 if (mntopts & FSESS_DAEMON_CAN_SPY) 257 err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER); 258 if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid) 259 /* are we allowed to do the first mount? */ 260 err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER); 261 262 out: 263 FUSE_UNLOCK(); 264 return err; 265 } 266 267 static int 268 fuse_vfsop_fhtovp(struct mount *mp, struct fid *fhp, int flags, 269 struct vnode **vpp) 270 { 271 struct fuse_fid *ffhp = (struct fuse_fid *)fhp; 272 struct fuse_vnode_data *fvdat; 273 struct vnode *nvp; 274 int error; 275 276 if (!(fuse_get_mpdata(mp)->dataflags & FSESS_EXPORT_SUPPORT)) 277 return (EXTERROR(EOPNOTSUPP, "NFS-style lookups are not supported")); 278 279 error = VFS_VGET(mp, ffhp->nid, LK_EXCLUSIVE, &nvp); 280 if (error) { 281 *vpp = NULL; 282 return (error); 283 } 284 fvdat = VTOFUD(nvp); 285 if (fvdat->generation != ffhp->gen ) { 286 vput(nvp); 287 *vpp = NULL; 288 return (ESTALE); 289 } 290 *vpp = nvp; 291 vnode_create_vobject(*vpp, VNODE_NO_SIZE, curthread); 292 return (0); 293 } 294 295 static int 296 fuse_vfsop_mount(struct mount *mp) 297 { 298 int err; 299 300 uint64_t mntopts, __mntopts; 301 uint32_t max_read; 302 int linux_errnos; 303 int daemon_timeout; 304 int fd; 305 306 struct cdev *fdev; 307 struct fuse_data *data = NULL; 308 struct thread *td; 309 struct file *fp, *fptmp; 310 char *fspec, *subtype, *fsname = NULL; 311 int fsnamelen; 312 struct vfsoptlist *opts; 313 314 subtype = NULL; 315 max_read = ~0; 316 linux_errnos = 0; 317 err = 0; 318 mntopts = 0; 319 __mntopts = 0; 320 td = curthread; 321 322 /* Get the new options passed to mount */ 323 opts = mp->mnt_optnew; 324 325 if (!opts) 326 return (EXTERROR(EINVAL, "Mount options were not supplied")); 327 328 /* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */ 329 if (!vfs_getopts(opts, "fspath", &err)) 330 return (EXTERROR(err, "Mount options are missing 'fspath'")); 331 332 /* 333 * With the help of underscored options the mount program 334 * can inform us from the flags it sets by default 335 */ 336 FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY); 337 FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN); 338 FUSE_FLAGOPT(default_permissions, FSESS_DEFAULT_PERMISSIONS); 339 FUSE_FLAGOPT(intr, FSESS_INTR); 340 FUSE_FLAGOPT(auto_unmount, FSESS_AUTO_UNMOUNT); 341 342 (void)vfs_scanopt(opts, "max_read=", "%u", &max_read); 343 (void)vfs_scanopt(opts, "linux_errnos", "%d", &linux_errnos); 344 if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) { 345 if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT) 346 daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT; 347 else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT) 348 daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT; 349 } else { 350 daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT; 351 } 352 subtype = vfs_getopts(opts, "subtype=", &err); 353 354 SDT_PROBE1(fusefs, , vfsops, mntopts, mntopts); 355 356 if (mp->mnt_flag & MNT_UPDATE) { 357 return fuse_vfs_remount(mp, td, mntopts, max_read, 358 daemon_timeout); 359 } 360 361 /* `from' contains the device name (eg. /dev/fuse0); REQUIRED */ 362 fspec = vfs_getopts(opts, "from", &err); 363 if (!fspec) 364 return (EXTERROR(err, "Mount options are missing 'from'")); 365 366 /* `fd' contains the filedescriptor for this session; REQUIRED */ 367 if (vfs_scanopt(opts, "fd", "%d", &fd) != 1) 368 return (EXTERROR(EINVAL, "Mount options contain an invalid value " 369 "for 'fd'")); 370 371 err = fuse_getdevice(fspec, td, &fdev); 372 if (err != 0) 373 return err; 374 375 err = fget(td, fd, &cap_read_rights, &fp); 376 if (err != 0) { 377 SDT_PROBE2(fusefs, , vfsops, trace, 1, 378 "invalid or not opened device"); 379 goto out; 380 } 381 fptmp = td->td_fpop; 382 td->td_fpop = fp; 383 err = devfs_get_cdevpriv((void **)&data); 384 td->td_fpop = fptmp; 385 fdrop(fp, td); 386 FUSE_LOCK(); 387 388 if (err != 0 || data == NULL) { 389 err = ENXIO; 390 SDT_PROBE4(fusefs, , vfsops, mount_err, 391 "invalid or not opened device", data, mp, err); 392 FUSE_UNLOCK(); 393 goto out; 394 } 395 if (fdata_get_dead(data)) { 396 err = ENOTCONN; 397 SDT_PROBE4(fusefs, , vfsops, mount_err, 398 "device is dead during mount", data, mp, err); 399 FUSE_UNLOCK(); 400 goto out; 401 } 402 /* Sanity + permission checks */ 403 if (!data->daemoncred) 404 panic("fuse daemon found, but identity unknown"); 405 if (mntopts & FSESS_DAEMON_CAN_SPY) { 406 err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER); 407 EXTERROR(err, "FUSE daemon requires privileges " 408 "due to 'allow_other' option"); 409 } 410 if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid) { 411 /* are we allowed to do the first mount? */ 412 err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER); 413 EXTERROR(err, "Mounting as a user that is different from the FUSE " 414 "daemon's requires privileges"); 415 } 416 if (err) { 417 FUSE_UNLOCK(); 418 goto out; 419 } 420 data->ref++; 421 data->mp = mp; 422 data->dataflags |= mntopts; 423 data->max_read = max_read; 424 data->daemon_timeout = daemon_timeout; 425 data->linux_errnos = linux_errnos; 426 data->mnt_flag = mp->mnt_flag & MNT_UPDATEMASK; 427 FUSE_UNLOCK(); 428 429 vfs_getnewfsid(mp); 430 MNT_ILOCK(mp); 431 mp->mnt_data = data; 432 /* 433 * FUSE file systems can be either local or remote, but the kernel 434 * can't tell the difference. 435 */ 436 mp->mnt_flag &= ~MNT_LOCAL; 437 mp->mnt_kern_flag |= MNTK_USES_BCACHE; 438 /* 439 * Disable nullfs cacheing because it can consume too many resources in 440 * the FUSE server. 441 */ 442 mp->mnt_kern_flag |= MNTK_NULL_NOCACHE; 443 MNT_IUNLOCK(mp); 444 /* We need this here as this slot is used by getnewvnode() */ 445 mp->mnt_stat.f_iosize = maxbcachebuf; 446 if (subtype) { 447 strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN); 448 strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN); 449 } 450 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 451 vfs_getopt(opts, "fsname=", (void**)&fsname, &fsnamelen); 452 strlcpy(mp->mnt_stat.f_mntfromname, 453 fsname == NULL ? fspec : fsname, MNAMELEN); 454 mp->mnt_iosize_max = maxphys; 455 456 /* Now handshaking with daemon */ 457 fuse_internal_send_init(data, td); 458 459 out: 460 if (err) { 461 FUSE_LOCK(); 462 if (data != NULL && data->mp == mp) { 463 /* 464 * Destroy device only if we acquired reference to 465 * it 466 */ 467 SDT_PROBE4(fusefs, , vfsops, mount_err, 468 "mount failed, destroy device", data, mp, err); 469 data->mp = NULL; 470 mp->mnt_data = NULL; 471 fdata_trydestroy(data); 472 } 473 FUSE_UNLOCK(); 474 dev_rel(fdev); 475 } 476 return err; 477 } 478 479 static int 480 fuse_vfsop_unmount(struct mount *mp, int mntflags) 481 { 482 int err = 0; 483 int flags = 0; 484 485 struct cdev *fdev; 486 struct fuse_data *data; 487 struct fuse_dispatcher fdi; 488 struct thread *td = curthread; 489 490 if (mntflags & MNT_FORCE) { 491 flags |= FORCECLOSE; 492 } 493 data = fuse_get_mpdata(mp); 494 if (!data) { 495 panic("no private data for mount point?"); 496 } 497 /* There is 1 extra root vnode reference (mp->mnt_data). */ 498 FUSE_LOCK(); 499 if (data->vroot != NULL) { 500 struct vnode *vroot = data->vroot; 501 502 data->vroot = NULL; 503 FUSE_UNLOCK(); 504 vrele(vroot); 505 } else 506 FUSE_UNLOCK(); 507 err = vflush(mp, 0, flags, td); 508 if (err) { 509 return err; 510 } 511 if (fdata_get_dead(data)) { 512 goto alreadydead; 513 } 514 if (fsess_maybe_impl(mp, FUSE_DESTROY)) { 515 fdisp_init(&fdi, 0); 516 fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL); 517 518 (void)fdisp_wait_answ(&fdi); 519 fdisp_destroy(&fdi); 520 } 521 522 fdata_set_dead(data); 523 524 alreadydead: 525 FUSE_LOCK(); 526 data->mp = NULL; 527 fdev = data->fdev; 528 fdata_trydestroy(data); 529 FUSE_UNLOCK(); 530 531 MNT_ILOCK(mp); 532 mp->mnt_data = NULL; 533 MNT_IUNLOCK(mp); 534 535 dev_rel(fdev); 536 537 return 0; 538 } 539 540 SDT_PROBE_DEFINE1(fusefs, , vfsops, invalidate_without_export, 541 "struct mount*"); 542 static int 543 fuse_vfsop_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 544 { 545 struct fuse_data *data = fuse_get_mpdata(mp); 546 uint64_t nodeid = ino; 547 struct thread *td = curthread; 548 struct fuse_dispatcher fdi; 549 struct fuse_entry_out *feo; 550 struct fuse_vnode_data *fvdat; 551 struct timespec now; 552 const char dot[] = "."; 553 __enum_uint8(vtype) vtyp; 554 int error; 555 556 if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) { 557 /* 558 * Unreachable unless you do something stupid, like export a 559 * nullfs mount of a fusefs file system. 560 */ 561 SDT_PROBE1(fusefs, , vfsops, invalidate_without_export, mp); 562 return (EXTERROR(EOPNOTSUPP, "NFS-style lookups are not supported")); 563 } 564 565 error = fuse_internal_get_cached_vnode(mp, ino, flags, vpp); 566 if (error || *vpp != NULL) 567 return error; 568 569 getnanouptime(&now); 570 571 /* Do a LOOKUP, using nodeid as the parent and "." as filename */ 572 fdisp_init(&fdi, sizeof(dot)); 573 fdisp_make(&fdi, FUSE_LOOKUP, mp, nodeid, td, td->td_ucred); 574 memcpy(fdi.indata, dot, sizeof(dot)); 575 error = fdisp_wait_answ(&fdi); 576 577 if (error) 578 goto out; 579 580 feo = (struct fuse_entry_out *)fdi.answ; 581 582 if (feo->nodeid == 0) { 583 /* zero nodeid means ENOENT and cache it */ 584 error = ENOENT; 585 goto out; 586 } 587 588 if (feo->nodeid != nodeid) { 589 /* 590 * Something is very wrong with the server if "foo/." has a 591 * different inode number than "foo". 592 */ 593 static const char exterr[] = "Inconsistent LOOKUP response: " 594 "\"FILE/.\" has a different inode number than \"FILE\"."; 595 fuse_warn(data, FSESS_WARN_DOT_LOOKUP, exterr); 596 error = EXTERROR(EIO, exterr); 597 goto out; 598 } 599 600 vtyp = IFTOVT(feo->attr.mode); 601 error = fuse_vnode_get(mp, feo, nodeid, NULL, vpp, NULL, vtyp); 602 if (error) 603 goto out; 604 /* for last_local_modify and fuse_internal_cache_attrs */ 605 ASSERT_VOP_ELOCKED(*vpp, __func__); 606 fvdat = VTOFUD(*vpp); 607 608 if (timespeccmp(&now, &fvdat->last_local_modify, >)) { 609 /* 610 * Attributes from the server are definitely newer than the 611 * last attributes we sent to the server, so cache them. 612 */ 613 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid, 614 feo->attr_valid_nsec, NULL, true); 615 } 616 fuse_validity_2_bintime(feo->entry_valid, feo->entry_valid_nsec, 617 &fvdat->entry_cache_timeout); 618 out: 619 fdisp_destroy(&fdi); 620 return error; 621 } 622 623 static int 624 fuse_vfsop_root(struct mount *mp, int lkflags, struct vnode **vpp) 625 { 626 struct fuse_data *data = fuse_get_mpdata(mp); 627 int err = 0; 628 629 if (data->vroot != NULL) { 630 err = vget(data->vroot, lkflags); 631 if (err == 0) 632 *vpp = data->vroot; 633 } else { 634 err = fuse_vnode_get(mp, NULL, FUSE_ROOT_ID, NULL, vpp, NULL, 635 VDIR); 636 if (err == 0) { 637 FUSE_LOCK(); 638 MPASS(data->vroot == NULL || data->vroot == *vpp); 639 if (data->vroot == NULL) { 640 SDT_PROBE2(fusefs, , vfsops, trace, 1, 641 "new root vnode"); 642 data->vroot = *vpp; 643 FUSE_UNLOCK(); 644 vref(*vpp); 645 } else if (data->vroot != *vpp) { 646 SDT_PROBE2(fusefs, , vfsops, trace, 1, 647 "root vnode race"); 648 FUSE_UNLOCK(); 649 vput(*vpp); 650 vrecycle(*vpp); 651 *vpp = data->vroot; 652 } else 653 FUSE_UNLOCK(); 654 } 655 } 656 return err; 657 } 658 659 static int 660 fuse_vfsop_statfs(struct mount *mp, struct statfs *sbp) 661 { 662 struct fuse_dispatcher fdi; 663 int err = 0; 664 665 struct fuse_statfs_out *fsfo; 666 struct fuse_data *data; 667 668 data = fuse_get_mpdata(mp); 669 670 if (!(data->dataflags & FSESS_INITED)) 671 goto fake; 672 673 fdisp_init(&fdi, 0); 674 fdisp_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, NULL, NULL); 675 err = fdisp_wait_answ(&fdi); 676 if (err) { 677 fdisp_destroy(&fdi); 678 if (err == ENOTCONN) { 679 /* 680 * We want to seem a legitimate fs even if the daemon 681 * is stiff dead... (so that, eg., we can still do path 682 * based unmounting after the daemon dies). 683 */ 684 goto fake; 685 } 686 return err; 687 } 688 fsfo = fdi.answ; 689 690 sbp->f_blocks = fsfo->st.blocks; 691 sbp->f_bfree = fsfo->st.bfree; 692 sbp->f_bavail = fsfo->st.bavail; 693 sbp->f_files = fsfo->st.files; 694 sbp->f_ffree = fsfo->st.ffree; /* cast from uint64_t to int64_t */ 695 sbp->f_namemax = fsfo->st.namelen; 696 sbp->f_bsize = fsfo->st.frsize; /* cast from uint32_t to uint64_t */ 697 698 fdisp_destroy(&fdi); 699 return 0; 700 701 fake: 702 sbp->f_blocks = 0; 703 sbp->f_bfree = 0; 704 sbp->f_bavail = 0; 705 sbp->f_files = 0; 706 sbp->f_ffree = 0; 707 sbp->f_namemax = 0; 708 sbp->f_bsize = S_BLKSIZE; 709 710 return 0; 711 } 712