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/module.h>
65 #include <sys/systm.h>
66 #include <sys/errno.h>
67 #include <sys/kernel.h>
68 #include <sys/conf.h>
69 #include <sys/filio.h>
70 #include <sys/uio.h>
71 #include <sys/malloc.h>
72 #include <sys/queue.h>
73 #include <sys/limits.h>
74 #include <sys/lock.h>
75 #include <sys/rwlock.h>
76 #include <sys/sx.h>
77 #include <sys/proc.h>
78 #include <sys/mount.h>
79 #include <sys/vnode.h>
80 #include <sys/namei.h>
81 #include <sys/extattr.h>
82 #include <sys/stat.h>
83 #include <sys/unistd.h>
84 #include <sys/filedesc.h>
85 #include <sys/file.h>
86 #include <sys/fcntl.h>
87 #include <sys/dirent.h>
88 #include <sys/bio.h>
89 #include <sys/buf.h>
90 #include <sys/sysctl.h>
91 #include <sys/vmmeter.h>
92
93 #include <vm/vm.h>
94 #include <vm/vm_extern.h>
95 #include <vm/pmap.h>
96 #include <vm/vm_map.h>
97 #include <vm/vm_page.h>
98 #include <vm/vm_param.h>
99 #include <vm/vm_object.h>
100 #include <vm/vm_pager.h>
101 #include <vm/vnode_pager.h>
102 #include <vm/vm_object.h>
103
104 #include "fuse.h"
105 #include "fuse_file.h"
106 #include "fuse_internal.h"
107 #include "fuse_ipc.h"
108 #include "fuse_node.h"
109 #include "fuse_io.h"
110
111 #include <sys/priv.h>
112
113 /* Maximum number of hardlinks to a single FUSE file */
114 #define FUSE_LINK_MAX UINT32_MAX
115
116 SDT_PROVIDER_DECLARE(fusefs);
117 /*
118 * Fuse trace probe:
119 * arg0: verbosity. Higher numbers give more verbose messages
120 * arg1: Textual message
121 */
122 SDT_PROBE_DEFINE2(fusefs, , vnops, trace, "int", "char*");
123
124 /* vnode ops */
125 static vop_access_t fuse_vnop_access;
126 static vop_advlock_t fuse_vnop_advlock;
127 static vop_allocate_t fuse_vnop_allocate;
128 static vop_bmap_t fuse_vnop_bmap;
129 static vop_close_t fuse_fifo_close;
130 static vop_close_t fuse_vnop_close;
131 static vop_copy_file_range_t fuse_vnop_copy_file_range;
132 static vop_create_t fuse_vnop_create;
133 static vop_deallocate_t fuse_vnop_deallocate;
134 static vop_deleteextattr_t fuse_vnop_deleteextattr;
135 static vop_fdatasync_t fuse_vnop_fdatasync;
136 static vop_fsync_t fuse_vnop_fsync;
137 static vop_getattr_t fuse_vnop_getattr;
138 static vop_getextattr_t fuse_vnop_getextattr;
139 static vop_inactive_t fuse_vnop_inactive;
140 static vop_ioctl_t fuse_vnop_ioctl;
141 static vop_link_t fuse_vnop_link;
142 static vop_listextattr_t fuse_vnop_listextattr;
143 static vop_lookup_t fuse_vnop_lookup;
144 static vop_mkdir_t fuse_vnop_mkdir;
145 static vop_mknod_t fuse_vnop_mknod;
146 static vop_open_t fuse_vnop_open;
147 static vop_pathconf_t fuse_vnop_pathconf;
148 static vop_read_t fuse_vnop_read;
149 static vop_readdir_t fuse_vnop_readdir;
150 static vop_readlink_t fuse_vnop_readlink;
151 static vop_reclaim_t fuse_vnop_reclaim;
152 static vop_remove_t fuse_vnop_remove;
153 static vop_rename_t fuse_vnop_rename;
154 static vop_rmdir_t fuse_vnop_rmdir;
155 static vop_setattr_t fuse_vnop_setattr;
156 static vop_setextattr_t fuse_vnop_setextattr;
157 static vop_strategy_t fuse_vnop_strategy;
158 static vop_symlink_t fuse_vnop_symlink;
159 static vop_write_t fuse_vnop_write;
160 static vop_getpages_t fuse_vnop_getpages;
161 static vop_print_t fuse_vnop_print;
162 static vop_vptofh_t fuse_vnop_vptofh;
163
164 struct vop_vector fuse_fifoops = {
165 .vop_default = &fifo_specops,
166 .vop_access = fuse_vnop_access,
167 .vop_close = fuse_fifo_close,
168 .vop_fsync = fuse_vnop_fsync,
169 .vop_getattr = fuse_vnop_getattr,
170 .vop_inactive = fuse_vnop_inactive,
171 .vop_pathconf = fuse_vnop_pathconf,
172 .vop_print = fuse_vnop_print,
173 .vop_read = VOP_PANIC,
174 .vop_reclaim = fuse_vnop_reclaim,
175 .vop_setattr = fuse_vnop_setattr,
176 .vop_write = VOP_PANIC,
177 .vop_vptofh = fuse_vnop_vptofh,
178 };
179 VFS_VOP_VECTOR_REGISTER(fuse_fifoops);
180
181 struct vop_vector fuse_vnops = {
182 .vop_allocate = fuse_vnop_allocate,
183 .vop_default = &default_vnodeops,
184 .vop_access = fuse_vnop_access,
185 .vop_advlock = fuse_vnop_advlock,
186 .vop_bmap = fuse_vnop_bmap,
187 .vop_close = fuse_vnop_close,
188 .vop_copy_file_range = fuse_vnop_copy_file_range,
189 .vop_create = fuse_vnop_create,
190 .vop_deallocate = fuse_vnop_deallocate,
191 .vop_deleteextattr = fuse_vnop_deleteextattr,
192 .vop_fsync = fuse_vnop_fsync,
193 .vop_fdatasync = fuse_vnop_fdatasync,
194 .vop_getattr = fuse_vnop_getattr,
195 .vop_getextattr = fuse_vnop_getextattr,
196 .vop_inactive = fuse_vnop_inactive,
197 .vop_ioctl = fuse_vnop_ioctl,
198 .vop_link = fuse_vnop_link,
199 .vop_listextattr = fuse_vnop_listextattr,
200 .vop_lookup = fuse_vnop_lookup,
201 .vop_mkdir = fuse_vnop_mkdir,
202 .vop_mknod = fuse_vnop_mknod,
203 .vop_open = fuse_vnop_open,
204 .vop_pathconf = fuse_vnop_pathconf,
205 /*
206 * TODO: implement vop_poll after upgrading to protocol 7.21.
207 * FUSE_POLL was added in protocol 7.11, but it's kind of broken until
208 * 7.21, which adds the ability for the client to choose which poll
209 * events it wants, and for a client to deregister a file handle
210 */
211 .vop_read = fuse_vnop_read,
212 .vop_readdir = fuse_vnop_readdir,
213 .vop_readlink = fuse_vnop_readlink,
214 .vop_reclaim = fuse_vnop_reclaim,
215 .vop_remove = fuse_vnop_remove,
216 .vop_rename = fuse_vnop_rename,
217 .vop_rmdir = fuse_vnop_rmdir,
218 .vop_setattr = fuse_vnop_setattr,
219 .vop_setextattr = fuse_vnop_setextattr,
220 .vop_strategy = fuse_vnop_strategy,
221 .vop_symlink = fuse_vnop_symlink,
222 .vop_write = fuse_vnop_write,
223 .vop_getpages = fuse_vnop_getpages,
224 .vop_print = fuse_vnop_print,
225 .vop_vptofh = fuse_vnop_vptofh,
226 };
227 VFS_VOP_VECTOR_REGISTER(fuse_vnops);
228
229 /* Check permission for extattr operations, much like extattr_check_cred */
230 static int
fuse_extattr_check_cred(struct vnode * vp,int ns,struct ucred * cred,struct thread * td,accmode_t accmode)231 fuse_extattr_check_cred(struct vnode *vp, int ns, struct ucred *cred,
232 struct thread *td, accmode_t accmode)
233 {
234 struct mount *mp = vnode_mount(vp);
235 struct fuse_data *data = fuse_get_mpdata(mp);
236 int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS;
237
238 /*
239 * Kernel-invoked always succeeds.
240 */
241 if (cred == NOCRED)
242 return (0);
243
244 /*
245 * Do not allow privileged processes in jail to directly manipulate
246 * system attributes.
247 */
248 switch (ns) {
249 case EXTATTR_NAMESPACE_SYSTEM:
250 if (default_permissions) {
251 return (priv_check_cred(cred, PRIV_VFS_EXTATTR_SYSTEM));
252 }
253 return (0);
254 case EXTATTR_NAMESPACE_USER:
255 if (default_permissions) {
256 return (fuse_internal_access(vp, accmode, td, cred));
257 }
258 return (0);
259 default:
260 return (EPERM);
261 }
262 }
263
264 /* Get a filehandle for a directory */
265 static int
fuse_filehandle_get_dir(struct vnode * vp,struct fuse_filehandle ** fufhp,struct ucred * cred,pid_t pid)266 fuse_filehandle_get_dir(struct vnode *vp, struct fuse_filehandle **fufhp,
267 struct ucred *cred, pid_t pid)
268 {
269 if (fuse_filehandle_get(vp, FREAD, fufhp, cred, pid) == 0)
270 return 0;
271 return fuse_filehandle_get(vp, FEXEC, fufhp, cred, pid);
272 }
273
274 /* Send FUSE_FLUSH for this vnode */
275 static int
fuse_flush(struct vnode * vp,struct ucred * cred,pid_t pid,int fflag)276 fuse_flush(struct vnode *vp, struct ucred *cred, pid_t pid, int fflag)
277 {
278 struct fuse_flush_in *ffi;
279 struct fuse_filehandle *fufh;
280 struct fuse_dispatcher fdi;
281 struct thread *td = curthread;
282 struct mount *mp = vnode_mount(vp);
283 int err;
284
285 if (fsess_not_impl(vnode_mount(vp), FUSE_FLUSH))
286 return 0;
287
288 err = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid);
289 if (err)
290 return err;
291
292 fdisp_init(&fdi, sizeof(*ffi));
293 fdisp_make_vp(&fdi, FUSE_FLUSH, vp, td, cred);
294 ffi = fdi.indata;
295 ffi->fh = fufh->fh_id;
296 /*
297 * If the file has a POSIX lock then we're supposed to set lock_owner.
298 * If not, then lock_owner is undefined. So we may as well always set
299 * it.
300 */
301 ffi->lock_owner = td->td_proc->p_pid;
302
303 err = fdisp_wait_answ(&fdi);
304 if (err == ENOSYS) {
305 fsess_set_notimpl(mp, FUSE_FLUSH);
306 err = 0;
307 }
308 fdisp_destroy(&fdi);
309 return err;
310 }
311
312 /* Close wrapper for fifos. */
313 static int
fuse_fifo_close(struct vop_close_args * ap)314 fuse_fifo_close(struct vop_close_args *ap)
315 {
316 return (fifo_specops.vop_close(ap));
317 }
318
319 /* Invalidate a range of cached data, whether dirty of not */
320 static int
fuse_inval_buf_range(struct vnode * vp,off_t filesize,off_t start,off_t end)321 fuse_inval_buf_range(struct vnode *vp, off_t filesize, off_t start, off_t end)
322 {
323 struct buf *bp;
324 daddr_t left_lbn, end_lbn, right_lbn;
325 off_t new_filesize;
326 int iosize, left_on, right_on, right_blksize;
327
328 iosize = fuse_iosize(vp);
329 left_lbn = start / iosize;
330 end_lbn = howmany(end, iosize);
331 left_on = start & (iosize - 1);
332 if (left_on != 0) {
333 bp = getblk(vp, left_lbn, iosize, PCATCH, 0, 0);
334 if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyend >= left_on) {
335 /*
336 * Flush the dirty buffer, because we don't have a
337 * byte-granular way to record which parts of the
338 * buffer are valid.
339 */
340 bwrite(bp);
341 if (bp->b_error)
342 return (bp->b_error);
343 } else {
344 brelse(bp);
345 }
346 }
347 right_on = end & (iosize - 1);
348 if (right_on != 0) {
349 right_lbn = end / iosize;
350 new_filesize = MAX(filesize, end);
351 right_blksize = MIN(iosize, new_filesize - iosize * right_lbn);
352 bp = getblk(vp, right_lbn, right_blksize, PCATCH, 0, 0);
353 if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyoff < right_on) {
354 /*
355 * Flush the dirty buffer, because we don't have a
356 * byte-granular way to record which parts of the
357 * buffer are valid.
358 */
359 bwrite(bp);
360 if (bp->b_error)
361 return (bp->b_error);
362 } else {
363 brelse(bp);
364 }
365 }
366
367 v_inval_buf_range(vp, left_lbn, end_lbn, iosize);
368 return (0);
369 }
370
371
372 /* Send FUSE_LSEEK for this node */
373 static int
fuse_vnop_do_lseek(struct vnode * vp,struct thread * td,struct ucred * cred,pid_t pid,off_t * offp,int whence)374 fuse_vnop_do_lseek(struct vnode *vp, struct thread *td, struct ucred *cred,
375 pid_t pid, off_t *offp, int whence)
376 {
377 struct fuse_dispatcher fdi;
378 struct fuse_filehandle *fufh;
379 struct fuse_lseek_in *flsi;
380 struct fuse_lseek_out *flso;
381 struct mount *mp = vnode_mount(vp);
382 int err;
383
384 ASSERT_VOP_LOCKED(vp, __func__);
385
386 err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid);
387 if (err)
388 return (err);
389 fdisp_init(&fdi, sizeof(*flsi));
390 fdisp_make_vp(&fdi, FUSE_LSEEK, vp, td, cred);
391 flsi = fdi.indata;
392 flsi->fh = fufh->fh_id;
393 flsi->offset = *offp;
394 flsi->whence = whence;
395 err = fdisp_wait_answ(&fdi);
396 if (err == ENOSYS) {
397 fsess_set_notimpl(mp, FUSE_LSEEK);
398 } else if (err == ENXIO) {
399 /* Note: ENXIO means "no more hole/data regions until EOF" */
400 fsess_set_impl(mp, FUSE_LSEEK);
401 } else if (err == 0) {
402 fsess_set_impl(mp, FUSE_LSEEK);
403 flso = fdi.answ;
404 *offp = flso->offset;
405 }
406 fdisp_destroy(&fdi);
407
408 return (err);
409 }
410
411 /*
412 struct vnop_access_args {
413 struct vnode *a_vp;
414 #if VOP_ACCESS_TAKES_ACCMODE_T
415 accmode_t a_accmode;
416 #else
417 int a_mode;
418 #endif
419 struct ucred *a_cred;
420 struct thread *a_td;
421 };
422 */
423 static int
fuse_vnop_access(struct vop_access_args * ap)424 fuse_vnop_access(struct vop_access_args *ap)
425 {
426 struct vnode *vp = ap->a_vp;
427 int accmode = ap->a_accmode;
428 struct ucred *cred = ap->a_cred;
429
430 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
431
432 int err;
433
434 if (fuse_isdeadfs(vp)) {
435 if (vnode_isvroot(vp)) {
436 return 0;
437 }
438 return ENXIO;
439 }
440 if (!(data->dataflags & FSESS_INITED)) {
441 if (vnode_isvroot(vp)) {
442 if (priv_check_cred(cred, PRIV_VFS_ADMIN) ||
443 (fuse_match_cred(data->daemoncred, cred) == 0)) {
444 return 0;
445 }
446 }
447 return EBADF;
448 }
449 if (vnode_islnk(vp)) {
450 return 0;
451 }
452
453 err = fuse_internal_access(vp, accmode, ap->a_td, ap->a_cred);
454 return err;
455 }
456
457 /*
458 * struct vop_advlock_args {
459 * struct vop_generic_args a_gen;
460 * struct vnode *a_vp;
461 * void *a_id;
462 * int a_op;
463 * struct flock *a_fl;
464 * int a_flags;
465 * }
466 */
467 static int
fuse_vnop_advlock(struct vop_advlock_args * ap)468 fuse_vnop_advlock(struct vop_advlock_args *ap)
469 {
470 struct vnode *vp = ap->a_vp;
471 struct flock *fl = ap->a_fl;
472 struct thread *td = curthread;
473 struct ucred *cred = td->td_ucred;
474 pid_t pid = td->td_proc->p_pid;
475 struct fuse_filehandle *fufh;
476 struct fuse_dispatcher fdi;
477 struct fuse_lk_in *fli;
478 struct fuse_lk_out *flo;
479 struct vattr vattr;
480 enum fuse_opcode op;
481 off_t size, start;
482 int dataflags, err;
483 int flags = ap->a_flags;
484
485 dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
486
487 if (fuse_isdeadfs(vp)) {
488 return ENXIO;
489 }
490
491 switch(ap->a_op) {
492 case F_GETLK:
493 op = FUSE_GETLK;
494 break;
495 case F_SETLK:
496 if (flags & F_WAIT)
497 op = FUSE_SETLKW;
498 else
499 op = FUSE_SETLK;
500 break;
501 case F_UNLCK:
502 op = FUSE_SETLK;
503 break;
504 default:
505 return EINVAL;
506 }
507
508 if (!(dataflags & FSESS_POSIX_LOCKS))
509 return vop_stdadvlock(ap);
510 /* FUSE doesn't properly support flock until protocol 7.17 */
511 if (flags & F_FLOCK)
512 return vop_stdadvlock(ap);
513
514 vn_lock(vp, LK_SHARED | LK_RETRY);
515
516 switch (fl->l_whence) {
517 case SEEK_SET:
518 case SEEK_CUR:
519 /*
520 * Caller is responsible for adding any necessary offset
521 * when SEEK_CUR is used.
522 */
523 start = fl->l_start;
524 break;
525
526 case SEEK_END:
527 err = fuse_internal_getattr(vp, &vattr, cred, td);
528 if (err)
529 goto out;
530 size = vattr.va_size;
531 if (size > OFF_MAX ||
532 (fl->l_start > 0 && size > OFF_MAX - fl->l_start)) {
533 err = EOVERFLOW;
534 goto out;
535 }
536 start = size + fl->l_start;
537 break;
538
539 default:
540 return (EINVAL);
541 }
542
543 err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid);
544 if (err)
545 goto out;
546
547 fdisp_init(&fdi, sizeof(*fli));
548
549 fdisp_make_vp(&fdi, op, vp, td, cred);
550 fli = fdi.indata;
551 fli->fh = fufh->fh_id;
552 fli->owner = td->td_proc->p_pid;
553 fli->lk.start = start;
554 if (fl->l_len != 0)
555 fli->lk.end = start + fl->l_len - 1;
556 else
557 fli->lk.end = INT64_MAX;
558 fli->lk.type = fl->l_type;
559 fli->lk.pid = td->td_proc->p_pid;
560
561 err = fdisp_wait_answ(&fdi);
562 fdisp_destroy(&fdi);
563
564 if (err == 0 && op == FUSE_GETLK) {
565 flo = fdi.answ;
566 fl->l_type = flo->lk.type;
567 fl->l_whence = SEEK_SET;
568 if (flo->lk.type != F_UNLCK) {
569 fl->l_pid = flo->lk.pid;
570 fl->l_start = flo->lk.start;
571 if (flo->lk.end == INT64_MAX)
572 fl->l_len = 0;
573 else
574 fl->l_len = flo->lk.end - flo->lk.start + 1;
575 fl->l_start = flo->lk.start;
576 }
577 }
578
579 out:
580 VOP_UNLOCK(vp);
581 return err;
582 }
583
584 static int
fuse_vnop_allocate(struct vop_allocate_args * ap)585 fuse_vnop_allocate(struct vop_allocate_args *ap)
586 {
587 struct vnode *vp = ap->a_vp;
588 off_t *len = ap->a_len;
589 off_t *offset = ap->a_offset;
590 struct ucred *cred = ap->a_cred;
591 struct fuse_filehandle *fufh;
592 struct mount *mp = vnode_mount(vp);
593 struct fuse_dispatcher fdi;
594 struct fuse_fallocate_in *ffi;
595 struct uio io;
596 pid_t pid = curthread->td_proc->p_pid;
597 struct fuse_vnode_data *fvdat = VTOFUD(vp);
598 off_t filesize;
599 int err;
600
601 if (fuse_isdeadfs(vp))
602 return (ENXIO);
603
604 switch (vp->v_type) {
605 case VFIFO:
606 return (ESPIPE);
607 case VLNK:
608 case VREG:
609 if (vfs_isrdonly(mp))
610 return (EROFS);
611 break;
612 default:
613 return (ENODEV);
614 }
615
616 if (vfs_isrdonly(mp))
617 return (EROFS);
618
619 if (fsess_not_impl(mp, FUSE_FALLOCATE))
620 return (EINVAL);
621
622 io.uio_offset = *offset;
623 io.uio_resid = *len;
624 err = vn_rlimit_fsize(vp, &io, curthread);
625 if (err)
626 return (err);
627
628 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
629 if (err)
630 return (err);
631
632 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE);
633
634 err = fuse_vnode_size(vp, &filesize, cred, curthread);
635 if (err)
636 return (err);
637 fuse_inval_buf_range(vp, filesize, *offset, *offset + *len);
638
639 fdisp_init(&fdi, sizeof(*ffi));
640 fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred);
641 ffi = fdi.indata;
642 ffi->fh = fufh->fh_id;
643 ffi->offset = *offset;
644 ffi->length = *len;
645 ffi->mode = 0;
646 err = fdisp_wait_answ(&fdi);
647
648 if (err == ENOSYS) {
649 fsess_set_notimpl(mp, FUSE_FALLOCATE);
650 err = EINVAL;
651 } else if (err == EOPNOTSUPP) {
652 /*
653 * The file system server does not support FUSE_FALLOCATE with
654 * the supplied mode for this particular file.
655 */
656 err = EINVAL;
657 } else if (!err) {
658 *offset += *len;
659 *len = 0;
660 fuse_vnode_undirty_cached_timestamps(vp, false);
661 fuse_internal_clear_suid_on_write(vp, cred, curthread);
662 if (*offset > fvdat->cached_attrs.va_size) {
663 fuse_vnode_setsize(vp, *offset, false);
664 getnanouptime(&fvdat->last_local_modify);
665 }
666 }
667
668 fdisp_destroy(&fdi);
669 return (err);
670 }
671
672 /* {
673 struct vnode *a_vp;
674 daddr_t a_bn;
675 struct bufobj **a_bop;
676 daddr_t *a_bnp;
677 int *a_runp;
678 int *a_runb;
679 } */
680 static int
fuse_vnop_bmap(struct vop_bmap_args * ap)681 fuse_vnop_bmap(struct vop_bmap_args *ap)
682 {
683 struct vnode *vp = ap->a_vp;
684 struct bufobj **bo = ap->a_bop;
685 struct thread *td = curthread;
686 struct mount *mp;
687 struct fuse_dispatcher fdi;
688 struct fuse_bmap_in *fbi;
689 struct fuse_bmap_out *fbo;
690 struct fuse_data *data;
691 struct fuse_vnode_data *fvdat = VTOFUD(vp);
692 uint64_t biosize;
693 off_t fsize;
694 daddr_t lbn = ap->a_bn;
695 daddr_t *pbn = ap->a_bnp;
696 int *runp = ap->a_runp;
697 int *runb = ap->a_runb;
698 int error = 0;
699 int maxrun;
700
701 if (fuse_isdeadfs(vp)) {
702 return ENXIO;
703 }
704
705 mp = vnode_mount(vp);
706 data = fuse_get_mpdata(mp);
707 biosize = fuse_iosize(vp);
708 maxrun = MIN(vp->v_mount->mnt_iosize_max / biosize - 1,
709 data->max_readahead_blocks);
710
711 if (bo != NULL)
712 *bo = &vp->v_bufobj;
713
714 /*
715 * The FUSE_BMAP operation does not include the runp and runb
716 * variables, so we must guess. Report nonzero contiguous runs so
717 * cluster_read will combine adjacent reads. It's worthwhile to reduce
718 * upcalls even if we don't know the true physical layout of the file.
719 *
720 * FUSE file systems may opt out of read clustering in two ways:
721 * * mounting with -onoclusterr
722 * * Setting max_readahead <= maxbcachebuf during FUSE_INIT
723 */
724 if (runb != NULL)
725 *runb = MIN(lbn, maxrun);
726 if (runp != NULL && maxrun == 0)
727 *runp = 0;
728 else if (runp != NULL) {
729 /*
730 * If the file's size is cached, use that value to calculate
731 * runp, even if the cache is expired. runp is only advisory,
732 * and the risk of getting it wrong is not worth the cost of
733 * another upcall.
734 */
735 if (fvdat->cached_attrs.va_size != VNOVAL)
736 fsize = fvdat->cached_attrs.va_size;
737 else
738 error = fuse_vnode_size(vp, &fsize, td->td_ucred, td);
739 if (error == 0)
740 *runp = MIN(MAX(0, fsize / (off_t)biosize - lbn - 1),
741 maxrun);
742 else
743 *runp = 0;
744 }
745
746 if (fsess_maybe_impl(mp, FUSE_BMAP)) {
747 fdisp_init(&fdi, sizeof(*fbi));
748 fdisp_make_vp(&fdi, FUSE_BMAP, vp, td, td->td_ucred);
749 fbi = fdi.indata;
750 fbi->block = lbn;
751 fbi->blocksize = biosize;
752 error = fdisp_wait_answ(&fdi);
753 if (error == ENOSYS) {
754 fdisp_destroy(&fdi);
755 fsess_set_notimpl(mp, FUSE_BMAP);
756 error = 0;
757 } else {
758 fbo = fdi.answ;
759 if (error == 0 && pbn != NULL)
760 *pbn = fbo->block;
761 fdisp_destroy(&fdi);
762 return error;
763 }
764 }
765
766 /* If the daemon doesn't support BMAP, make up a sensible default */
767 if (pbn != NULL)
768 *pbn = lbn * btodb(biosize);
769 return (error);
770 }
771
772 /*
773 struct vop_close_args {
774 struct vnode *a_vp;
775 int a_fflag;
776 struct ucred *a_cred;
777 struct thread *a_td;
778 };
779 */
780 static int
fuse_vnop_close(struct vop_close_args * ap)781 fuse_vnop_close(struct vop_close_args *ap)
782 {
783 struct vnode *vp = ap->a_vp;
784 struct mount *mp = vnode_mount(vp);
785 struct ucred *cred = ap->a_cred;
786 int fflag = ap->a_fflag;
787 struct thread *td = ap->a_td;
788 pid_t pid = td->td_proc->p_pid;
789 struct fuse_vnode_data *fvdat = VTOFUD(vp);
790 int err = 0;
791
792 if (fuse_isdeadfs(vp))
793 return 0;
794 if (vnode_isdir(vp))
795 return 0;
796 if (fflag & IO_NDELAY)
797 return 0;
798
799 if (cred == NULL)
800 cred = td->td_ucred;
801
802 err = fuse_flush(vp, cred, pid, fflag);
803 if (err == 0 && (fvdat->flag & FN_ATIMECHANGE) && !vfs_isrdonly(mp)) {
804 struct vattr vap;
805 struct fuse_data *data;
806 int dataflags;
807 int access_e = 0;
808
809 data = fuse_get_mpdata(mp);
810 dataflags = data->dataflags;
811 if (dataflags & FSESS_DEFAULT_PERMISSIONS) {
812 struct vattr va;
813
814 fuse_internal_getattr(vp, &va, cred, td);
815 access_e = vaccess(vp->v_type, va.va_mode, va.va_uid,
816 va.va_gid, VWRITE, cred);
817 }
818 if (access_e == 0) {
819 VATTR_NULL(&vap);
820 vap.va_atime = fvdat->cached_attrs.va_atime;
821 /*
822 * Ignore errors setting when setting atime. That
823 * should not cause close(2) to fail.
824 */
825 fuse_internal_setattr(vp, &vap, td, NULL);
826 }
827 }
828 /* TODO: close the file handle, if we're sure it's no longer used */
829 if ((fvdat->flag & FN_SIZECHANGE) != 0) {
830 fuse_vnode_savesize(vp, cred, td->td_proc->p_pid);
831 }
832 return err;
833 }
834
835 /*
836 struct vop_copy_file_range_args {
837 struct vop_generic_args a_gen;
838 struct vnode *a_invp;
839 off_t *a_inoffp;
840 struct vnode *a_outvp;
841 off_t *a_outoffp;
842 size_t *a_lenp;
843 unsigned int a_flags;
844 struct ucred *a_incred;
845 struct ucred *a_outcred;
846 struct thread *a_fsizetd;
847 }
848 */
849 static int
fuse_vnop_copy_file_range(struct vop_copy_file_range_args * ap)850 fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap)
851 {
852 struct vnode *invp = ap->a_invp;
853 struct vnode *outvp = ap->a_outvp;
854 struct mount *mp = vnode_mount(invp);
855 struct fuse_vnode_data *outfvdat = VTOFUD(outvp);
856 struct fuse_dispatcher fdi;
857 struct fuse_filehandle *infufh, *outfufh;
858 struct fuse_copy_file_range_in *fcfri;
859 struct ucred *incred = ap->a_incred;
860 struct ucred *outcred = ap->a_outcred;
861 struct fuse_write_out *fwo;
862 struct thread *td;
863 struct uio io;
864 off_t outfilesize;
865 ssize_t r = 0;
866 pid_t pid;
867 int err;
868
869 err = ENOSYS;
870 if (mp == NULL || mp != vnode_mount(outvp))
871 goto fallback;
872
873 if (incred->cr_uid != outcred->cr_uid)
874 goto fallback;
875
876 if (incred->cr_groups[0] != outcred->cr_groups[0])
877 goto fallback;
878
879 /* Caller busied mp, mnt_data can be safely accessed. */
880 if (fsess_not_impl(mp, FUSE_COPY_FILE_RANGE))
881 goto fallback;
882
883 if (ap->a_fsizetd == NULL)
884 td = curthread;
885 else
886 td = ap->a_fsizetd;
887 pid = td->td_proc->p_pid;
888
889 vn_lock_pair(invp, false, LK_SHARED, outvp, false, LK_EXCLUSIVE);
890 if (invp->v_data == NULL || outvp->v_data == NULL) {
891 err = EBADF;
892 goto unlock;
893 }
894
895 err = fuse_filehandle_getrw(invp, FREAD, &infufh, incred, pid);
896 if (err)
897 goto unlock;
898
899 err = fuse_filehandle_getrw(outvp, FWRITE, &outfufh, outcred, pid);
900 if (err)
901 goto unlock;
902
903 io.uio_resid = *ap->a_lenp;
904 if (ap->a_fsizetd) {
905 io.uio_offset = *ap->a_outoffp;
906 err = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd);
907 if (err != 0)
908 goto unlock;
909 }
910
911 err = fuse_vnode_size(outvp, &outfilesize, outcred, curthread);
912 if (err)
913 goto unlock;
914
915 vnode_pager_clean_sync(invp);
916 err = fuse_inval_buf_range(outvp, outfilesize, *ap->a_outoffp,
917 *ap->a_outoffp + io.uio_resid);
918 if (err)
919 goto unlock;
920
921 fdisp_init(&fdi, sizeof(*fcfri));
922 fdisp_make_vp(&fdi, FUSE_COPY_FILE_RANGE, invp, td, incred);
923 fcfri = fdi.indata;
924 fcfri->fh_in = infufh->fh_id;
925 fcfri->off_in = *ap->a_inoffp;
926 fcfri->nodeid_out = VTOI(outvp);
927 fcfri->fh_out = outfufh->fh_id;
928 fcfri->off_out = *ap->a_outoffp;
929 fcfri->len = io.uio_resid;
930 fcfri->flags = 0;
931
932 err = fdisp_wait_answ(&fdi);
933 if (err == 0) {
934 fwo = fdi.answ;
935 *ap->a_lenp = fwo->size;
936 *ap->a_inoffp += fwo->size;
937 *ap->a_outoffp += fwo->size;
938 fuse_internal_clear_suid_on_write(outvp, outcred, td);
939 if (*ap->a_outoffp > outfvdat->cached_attrs.va_size) {
940 fuse_vnode_setsize(outvp, *ap->a_outoffp, false);
941 getnanouptime(&outfvdat->last_local_modify);
942 }
943 fuse_vnode_update(invp, FN_ATIMECHANGE);
944 fuse_vnode_update(outvp, FN_MTIMECHANGE | FN_CTIMECHANGE);
945 }
946 fdisp_destroy(&fdi);
947
948 unlock:
949 if (invp != outvp)
950 VOP_UNLOCK(invp);
951 VOP_UNLOCK(outvp);
952
953 if (err == ENOSYS)
954 fsess_set_notimpl(mp, FUSE_COPY_FILE_RANGE);
955 fallback:
956
957 /*
958 * No need to call vn_rlimit_fsizex_res before return, since the uio is
959 * local.
960 */
961 return (err);
962 }
963
964 static void
fdisp_make_mknod_for_fallback(struct fuse_dispatcher * fdip,struct componentname * cnp,struct vnode * dvp,uint64_t parentnid,struct thread * td,struct ucred * cred,mode_t mode,enum fuse_opcode * op)965 fdisp_make_mknod_for_fallback(
966 struct fuse_dispatcher *fdip,
967 struct componentname *cnp,
968 struct vnode *dvp,
969 uint64_t parentnid,
970 struct thread *td,
971 struct ucred *cred,
972 mode_t mode,
973 enum fuse_opcode *op)
974 {
975 struct fuse_mknod_in *fmni;
976
977 fdisp_init(fdip, sizeof(*fmni) + cnp->cn_namelen + 1);
978 *op = FUSE_MKNOD;
979 fdisp_make(fdip, *op, vnode_mount(dvp), parentnid, td, cred);
980 fmni = fdip->indata;
981 fmni->mode = mode;
982 fmni->rdev = 0;
983 memcpy((char *)fdip->indata + sizeof(*fmni), cnp->cn_nameptr,
984 cnp->cn_namelen);
985 ((char *)fdip->indata)[sizeof(*fmni) + cnp->cn_namelen] = '\0';
986 }
987 /*
988 struct vnop_create_args {
989 struct vnode *a_dvp;
990 struct vnode **a_vpp;
991 struct componentname *a_cnp;
992 struct vattr *a_vap;
993 };
994 */
995 static int
fuse_vnop_create(struct vop_create_args * ap)996 fuse_vnop_create(struct vop_create_args *ap)
997 {
998 struct vnode *dvp = ap->a_dvp;
999 struct vnode **vpp = ap->a_vpp;
1000 struct componentname *cnp = ap->a_cnp;
1001 struct vattr *vap = ap->a_vap;
1002 struct thread *td = curthread;
1003 struct ucred *cred = cnp->cn_cred;
1004
1005 struct fuse_data *data;
1006 struct fuse_create_in *fci;
1007 struct fuse_entry_out *feo;
1008 struct fuse_open_out *foo;
1009 struct fuse_dispatcher fdi, fdi2;
1010 struct fuse_dispatcher *fdip = &fdi;
1011 struct fuse_dispatcher *fdip2 = NULL;
1012
1013 int err;
1014
1015 struct mount *mp = vnode_mount(dvp);
1016 data = fuse_get_mpdata(mp);
1017 uint64_t parentnid = VTOFUD(dvp)->nid;
1018 mode_t mode = MAKEIMODE(vap->va_type, vap->va_mode);
1019 enum fuse_opcode op;
1020 int flags;
1021
1022 if (fuse_isdeadfs(dvp))
1023 return ENXIO;
1024
1025 /* FUSE expects sockets to be created with FUSE_MKNOD */
1026 if (vap->va_type == VSOCK)
1027 return fuse_internal_mknod(dvp, vpp, cnp, vap);
1028
1029 /*
1030 * VOP_CREATE doesn't tell us the open(2) flags, so we guess. Only a
1031 * writable mode makes sense, and we might as well include readability
1032 * too.
1033 */
1034 flags = O_RDWR;
1035
1036 bzero(&fdi, sizeof(fdi));
1037
1038 if (vap->va_type != VREG)
1039 return (EINVAL);
1040
1041 if (fsess_not_impl(mp, FUSE_CREATE) || vap->va_type == VSOCK) {
1042 /* Fallback to FUSE_MKNOD/FUSE_OPEN */
1043 fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td,
1044 cred, mode, &op);
1045 } else {
1046 /* Use FUSE_CREATE */
1047 size_t insize;
1048
1049 op = FUSE_CREATE;
1050 fdisp_init(fdip, sizeof(*fci) + cnp->cn_namelen + 1);
1051 fdisp_make(fdip, op, vnode_mount(dvp), parentnid, td, cred);
1052 fci = fdip->indata;
1053 fci->mode = mode;
1054 fci->flags = O_CREAT | flags;
1055 if (fuse_libabi_geq(data, 7, 12)) {
1056 insize = sizeof(*fci);
1057 fci->umask = td->td_proc->p_pd->pd_cmask;
1058 } else {
1059 insize = sizeof(struct fuse_open_in);
1060 }
1061
1062 memcpy((char *)fdip->indata + insize, cnp->cn_nameptr,
1063 cnp->cn_namelen);
1064 ((char *)fdip->indata)[insize + cnp->cn_namelen] = '\0';
1065 }
1066
1067 err = fdisp_wait_answ(fdip);
1068
1069 if (err) {
1070 if (err == ENOSYS && op == FUSE_CREATE) {
1071 fsess_set_notimpl(mp, FUSE_CREATE);
1072 fdisp_destroy(fdip);
1073 fdisp_make_mknod_for_fallback(fdip, cnp, dvp,
1074 parentnid, td, cred, mode, &op);
1075 err = fdisp_wait_answ(fdip);
1076 }
1077 if (err)
1078 goto out;
1079 }
1080
1081 feo = fdip->answ;
1082
1083 if ((err = fuse_internal_checkentry(feo, vap->va_type))) {
1084 goto out;
1085 }
1086
1087 if (op == FUSE_CREATE) {
1088 if (fuse_libabi_geq(data, 7, 9))
1089 foo = (struct fuse_open_out*)(feo + 1);
1090 else
1091 foo = (struct fuse_open_out*)((char*)feo +
1092 FUSE_COMPAT_ENTRY_OUT_SIZE);
1093 } else {
1094 /* Issue a separate FUSE_OPEN */
1095 struct fuse_open_in *foi;
1096
1097 fdip2 = &fdi2;
1098 fdisp_init(fdip2, sizeof(*foi));
1099 fdisp_make(fdip2, FUSE_OPEN, vnode_mount(dvp), feo->nodeid, td,
1100 cred);
1101 foi = fdip2->indata;
1102 foi->flags = flags;
1103 err = fdisp_wait_answ(fdip2);
1104 if (err)
1105 goto out;
1106 foo = fdip2->answ;
1107 }
1108 err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vap->va_type);
1109 if (err) {
1110 struct fuse_release_in *fri;
1111 uint64_t nodeid = feo->nodeid;
1112 uint64_t fh_id = foo->fh;
1113
1114 fdisp_destroy(fdip);
1115 fdisp_init(fdip, sizeof(*fri));
1116 fdisp_make(fdip, FUSE_RELEASE, mp, nodeid, td, cred);
1117 fri = fdip->indata;
1118 fri->fh = fh_id;
1119 fri->flags = flags;
1120 fuse_insert_callback(fdip->tick, fuse_internal_forget_callback);
1121 fuse_insert_message(fdip->tick, false);
1122 goto out;
1123 }
1124 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnop_create");
1125 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
1126 feo->attr_valid_nsec, NULL, true);
1127
1128 fuse_filehandle_init(*vpp, FUFH_RDWR, NULL, td, cred, foo);
1129 fuse_vnode_open(*vpp, foo->open_flags, td);
1130 /*
1131 * Purge the parent's attribute cache because the daemon should've
1132 * updated its mtime and ctime
1133 */
1134 fuse_vnode_clear_attr_cache(dvp);
1135 cache_purge_negative(dvp);
1136
1137 out:
1138 if (fdip2)
1139 fdisp_destroy(fdip2);
1140 fdisp_destroy(fdip);
1141 return err;
1142 }
1143
1144 /*
1145 struct vnop_fdatasync_args {
1146 struct vop_generic_args a_gen;
1147 struct vnode * a_vp;
1148 struct thread * a_td;
1149 };
1150 */
1151 static int
fuse_vnop_fdatasync(struct vop_fdatasync_args * ap)1152 fuse_vnop_fdatasync(struct vop_fdatasync_args *ap)
1153 {
1154 struct vnode *vp = ap->a_vp;
1155 struct thread *td = ap->a_td;
1156 int waitfor = MNT_WAIT;
1157
1158 int err = 0;
1159
1160 if (fuse_isdeadfs(vp)) {
1161 return 0;
1162 }
1163 if ((err = vop_stdfdatasync_buf(ap)))
1164 return err;
1165
1166 return fuse_internal_fsync(vp, td, waitfor, true);
1167 }
1168
1169 /*
1170 struct vnop_fsync_args {
1171 struct vop_generic_args a_gen;
1172 struct vnode * a_vp;
1173 int a_waitfor;
1174 struct thread * a_td;
1175 };
1176 */
1177 static int
fuse_vnop_fsync(struct vop_fsync_args * ap)1178 fuse_vnop_fsync(struct vop_fsync_args *ap)
1179 {
1180 struct vnode *vp = ap->a_vp;
1181 struct thread *td = ap->a_td;
1182 int waitfor = ap->a_waitfor;
1183 int err = 0;
1184
1185 if (fuse_isdeadfs(vp)) {
1186 return 0;
1187 }
1188 if ((err = vop_stdfsync(ap)))
1189 return err;
1190
1191 return fuse_internal_fsync(vp, td, waitfor, false);
1192 }
1193
1194 /*
1195 struct vnop_getattr_args {
1196 struct vnode *a_vp;
1197 struct vattr *a_vap;
1198 struct ucred *a_cred;
1199 struct thread *a_td;
1200 };
1201 */
1202 static int
fuse_vnop_getattr(struct vop_getattr_args * ap)1203 fuse_vnop_getattr(struct vop_getattr_args *ap)
1204 {
1205 struct vnode *vp = ap->a_vp;
1206 struct vattr *vap = ap->a_vap;
1207 struct ucred *cred = ap->a_cred;
1208 struct thread *td = curthread;
1209
1210 int err = 0;
1211 int dataflags;
1212
1213 dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
1214
1215 /* Note that we are not bailing out on a dead file system just yet. */
1216
1217 if (!(dataflags & FSESS_INITED)) {
1218 if (!vnode_isvroot(vp)) {
1219 fdata_set_dead(fuse_get_mpdata(vnode_mount(vp)));
1220 err = ENOTCONN;
1221 return err;
1222 } else {
1223 goto fake;
1224 }
1225 }
1226 err = fuse_internal_getattr(vp, vap, cred, td);
1227 if (err == ENOTCONN && vnode_isvroot(vp)) {
1228 /* see comment in fuse_vfsop_statfs() */
1229 goto fake;
1230 } else {
1231 return err;
1232 }
1233
1234 fake:
1235 bzero(vap, sizeof(*vap));
1236 vap->va_type = vnode_vtype(vp);
1237
1238 return 0;
1239 }
1240
1241 /*
1242 struct vnop_inactive_args {
1243 struct vnode *a_vp;
1244 };
1245 */
1246 static int
fuse_vnop_inactive(struct vop_inactive_args * ap)1247 fuse_vnop_inactive(struct vop_inactive_args *ap)
1248 {
1249 struct vnode *vp = ap->a_vp;
1250 struct thread *td = curthread;
1251
1252 struct fuse_vnode_data *fvdat = VTOFUD(vp);
1253 struct fuse_filehandle *fufh, *fufh_tmp;
1254
1255 int need_flush = 1;
1256
1257 LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) {
1258 if (need_flush && vp->v_type == VREG) {
1259 if ((VTOFUD(vp)->flag & FN_SIZECHANGE) != 0) {
1260 fuse_vnode_savesize(vp, NULL, 0);
1261 }
1262 if ((fvdat->flag & FN_REVOKED) != 0)
1263 fuse_io_invalbuf(vp, td);
1264 else
1265 fuse_io_flushbuf(vp, MNT_WAIT, td);
1266 need_flush = 0;
1267 }
1268 fuse_filehandle_close(vp, fufh, td, NULL);
1269 }
1270
1271 if ((fvdat->flag & FN_REVOKED) != 0)
1272 vrecycle(vp);
1273
1274 return 0;
1275 }
1276
1277 /*
1278 struct vnop_ioctl_args {
1279 struct vnode *a_vp;
1280 u_long a_command;
1281 caddr_t a_data;
1282 int a_fflag;
1283 struct ucred *a_cred;
1284 struct thread *a_td;
1285 };
1286 */
1287 static int
fuse_vnop_ioctl(struct vop_ioctl_args * ap)1288 fuse_vnop_ioctl(struct vop_ioctl_args *ap)
1289 {
1290 struct vnode *vp = ap->a_vp;
1291 struct mount *mp = vnode_mount(vp);
1292 struct ucred *cred = ap->a_cred;
1293 off_t *offp;
1294 pid_t pid = ap->a_td->td_proc->p_pid;
1295 int err;
1296
1297 switch (ap->a_command) {
1298 case FIOSEEKDATA:
1299 case FIOSEEKHOLE:
1300 /* Call FUSE_LSEEK, if we can, or fall back to vop_stdioctl */
1301 if (fsess_maybe_impl(mp, FUSE_LSEEK)) {
1302 int whence;
1303
1304 offp = ap->a_data;
1305 if (ap->a_command == FIOSEEKDATA)
1306 whence = SEEK_DATA;
1307 else
1308 whence = SEEK_HOLE;
1309
1310 vn_lock(vp, LK_SHARED | LK_RETRY);
1311 err = fuse_vnop_do_lseek(vp, ap->a_td, cred, pid, offp,
1312 whence);
1313 VOP_UNLOCK(vp);
1314 }
1315 if (fsess_not_impl(mp, FUSE_LSEEK))
1316 err = vop_stdioctl(ap);
1317 break;
1318 default:
1319 /* TODO: implement FUSE_IOCTL */
1320 err = ENOTTY;
1321 break;
1322 }
1323 return (err);
1324 }
1325
1326
1327 /*
1328 struct vnop_link_args {
1329 struct vnode *a_tdvp;
1330 struct vnode *a_vp;
1331 struct componentname *a_cnp;
1332 };
1333 */
1334 static int
fuse_vnop_link(struct vop_link_args * ap)1335 fuse_vnop_link(struct vop_link_args *ap)
1336 {
1337 struct vnode *vp = ap->a_vp;
1338 struct vnode *tdvp = ap->a_tdvp;
1339 struct componentname *cnp = ap->a_cnp;
1340
1341 struct vattr *vap = VTOVA(vp);
1342
1343 struct fuse_dispatcher fdi;
1344 struct fuse_entry_out *feo;
1345 struct fuse_link_in fli;
1346
1347 int err;
1348
1349 if (fuse_isdeadfs(vp)) {
1350 return ENXIO;
1351 }
1352 if (vnode_mount(tdvp) != vnode_mount(vp)) {
1353 return EXDEV;
1354 }
1355
1356 /*
1357 * This is a seatbelt check to protect naive userspace filesystems from
1358 * themselves and the limitations of the FUSE IPC protocol. If a
1359 * filesystem does not allow attribute caching, assume it is capable of
1360 * validating that nlink does not overflow.
1361 */
1362 if (vap != NULL && vap->va_nlink >= FUSE_LINK_MAX)
1363 return EMLINK;
1364 fli.oldnodeid = VTOI(vp);
1365
1366 fdisp_init(&fdi, 0);
1367 fuse_internal_newentry_makerequest(vnode_mount(tdvp), VTOI(tdvp), cnp,
1368 FUSE_LINK, &fli, sizeof(fli), &fdi);
1369 if ((err = fdisp_wait_answ(&fdi))) {
1370 goto out;
1371 }
1372 feo = fdi.answ;
1373
1374 if (fli.oldnodeid != feo->nodeid) {
1375 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
1376 fuse_warn(data, FSESS_WARN_ILLEGAL_INODE,
1377 "Assigned wrong inode for a hard link.");
1378 fuse_vnode_clear_attr_cache(vp);
1379 fuse_vnode_clear_attr_cache(tdvp);
1380 err = EIO;
1381 goto out;
1382 }
1383
1384 err = fuse_internal_checkentry(feo, vnode_vtype(vp));
1385 if (!err) {
1386 /*
1387 * Purge the parent's attribute cache because the daemon
1388 * should've updated its mtime and ctime
1389 */
1390 fuse_vnode_clear_attr_cache(tdvp);
1391 fuse_internal_cache_attrs(vp, &feo->attr, feo->attr_valid,
1392 feo->attr_valid_nsec, NULL, true);
1393 }
1394 out:
1395 fdisp_destroy(&fdi);
1396 return err;
1397 }
1398
1399 struct fuse_lookup_alloc_arg {
1400 struct fuse_entry_out *feo;
1401 struct componentname *cnp;
1402 uint64_t nid;
1403 __enum_uint8(vtype) vtyp;
1404 };
1405
1406 /* Callback for vn_get_ino */
1407 static int
fuse_lookup_alloc(struct mount * mp,void * arg,int lkflags,struct vnode ** vpp)1408 fuse_lookup_alloc(struct mount *mp, void *arg, int lkflags, struct vnode **vpp)
1409 {
1410 struct fuse_lookup_alloc_arg *flaa = arg;
1411
1412 return fuse_vnode_get(mp, flaa->feo, flaa->nid, NULL, vpp, flaa->cnp,
1413 flaa->vtyp);
1414 }
1415
1416 SDT_PROBE_DEFINE3(fusefs, , vnops, cache_lookup,
1417 "int", "struct timespec*", "struct timespec*");
1418 /*
1419 struct vnop_lookup_args {
1420 struct vnodeop_desc *a_desc;
1421 struct vnode *a_dvp;
1422 struct vnode **a_vpp;
1423 struct componentname *a_cnp;
1424 };
1425 */
1426 int
fuse_vnop_lookup(struct vop_lookup_args * ap)1427 fuse_vnop_lookup(struct vop_lookup_args *ap)
1428 {
1429 struct vnode *dvp = ap->a_dvp;
1430 struct vnode **vpp = ap->a_vpp;
1431 struct componentname *cnp = ap->a_cnp;
1432 struct thread *td = curthread;
1433 struct ucred *cred = cnp->cn_cred;
1434 struct timespec now;
1435
1436 int nameiop = cnp->cn_nameiop;
1437 bool isdotdot = cnp->cn_flags & ISDOTDOT;
1438 bool islastcn = cnp->cn_flags & ISLASTCN;
1439 struct mount *mp = vnode_mount(dvp);
1440 struct fuse_data *data = fuse_get_mpdata(mp);
1441 int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS;
1442 bool is_dot;
1443
1444 int err = 0;
1445 int lookup_err = 0;
1446 struct vnode *vp = NULL;
1447
1448 struct fuse_dispatcher fdi;
1449 bool did_lookup = false;
1450 struct fuse_entry_out *feo = NULL;
1451 __enum_uint8(vtype) vtyp; /* vnode type of target */
1452
1453 uint64_t nid;
1454
1455 if (fuse_isdeadfs(dvp)) {
1456 *vpp = NULL;
1457 return ENXIO;
1458 }
1459 if (!vnode_isdir(dvp))
1460 return ENOTDIR;
1461
1462 if (islastcn && vfs_isrdonly(mp) && (nameiop != LOOKUP))
1463 return EROFS;
1464
1465 if ((cnp->cn_flags & NOEXECCHECK) != 0)
1466 cnp->cn_flags &= ~NOEXECCHECK;
1467 else if ((err = fuse_internal_access(dvp, VEXEC, td, cred)))
1468 return err;
1469
1470 is_dot = cnp->cn_namelen == 1 && *(cnp->cn_nameptr) == '.';
1471 if (isdotdot && !(data->dataflags & FSESS_EXPORT_SUPPORT)) {
1472 if (!(VTOFUD(dvp)->flag & FN_PARENT_NID)) {
1473 /*
1474 * Since the file system doesn't support ".." lookups,
1475 * we have no way to find this entry.
1476 */
1477 return ESTALE;
1478 }
1479 nid = VTOFUD(dvp)->parent_nid;
1480 if (nid == 0)
1481 return ENOENT;
1482 /* .. is obviously a directory */
1483 vtyp = VDIR;
1484 } else if (is_dot) {
1485 nid = VTOI(dvp);
1486 /* . is obviously a directory */
1487 vtyp = VDIR;
1488 } else {
1489 struct timespec timeout;
1490 int ncpticks; /* here to accommodate for API contract */
1491
1492 err = cache_lookup(dvp, vpp, cnp, &timeout, &ncpticks);
1493 getnanouptime(&now);
1494 SDT_PROBE3(fusefs, , vnops, cache_lookup, err, &timeout, &now);
1495 switch (err) {
1496 case -1: /* positive match */
1497 if (timespeccmp(&timeout, &now, >)) {
1498 counter_u64_add(fuse_lookup_cache_hits, 1);
1499 } else {
1500 /* Cache timeout */
1501 counter_u64_add(fuse_lookup_cache_misses, 1);
1502 bintime_clear(
1503 &VTOFUD(*vpp)->entry_cache_timeout);
1504 cache_purge(*vpp);
1505 if (dvp != *vpp)
1506 vput(*vpp);
1507 else
1508 vrele(*vpp);
1509 *vpp = NULL;
1510 break;
1511 }
1512 return 0;
1513
1514 case 0: /* no match in cache */
1515 counter_u64_add(fuse_lookup_cache_misses, 1);
1516 break;
1517
1518 case ENOENT: /* negative match */
1519 if (timespeccmp(&timeout, &now, <=)) {
1520 /* Cache timeout */
1521 cache_purge_negative(dvp);
1522 break;
1523 }
1524 /* fall through */
1525 default:
1526 return err;
1527 }
1528
1529 fdisp_init(&fdi, cnp->cn_namelen + 1);
1530 fdisp_make(&fdi, FUSE_LOOKUP, mp, VTOI(dvp), td, cred);
1531
1532 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
1533 ((char *)fdi.indata)[cnp->cn_namelen] = '\0';
1534 lookup_err = fdisp_wait_answ(&fdi);
1535 did_lookup = true;
1536
1537 if (!lookup_err) {
1538 /* lookup call succeeded */
1539 feo = (struct fuse_entry_out *)fdi.answ;
1540 nid = feo->nodeid;
1541 if (nid == 0) {
1542 /* zero nodeid means ENOENT and cache it */
1543 struct timespec timeout;
1544
1545 fdi.answ_stat = ENOENT;
1546 lookup_err = ENOENT;
1547 if (cnp->cn_flags & MAKEENTRY) {
1548 fuse_validity_2_timespec(feo, &timeout);
1549 /* Use the same entry_time for .. as for
1550 * the file itself. That doesn't honor
1551 * exactly what the fuse server tells
1552 * us, but to do otherwise would require
1553 * another cache lookup at this point.
1554 */
1555 struct timespec *dtsp = NULL;
1556 cache_enter_time(dvp, *vpp, cnp,
1557 &timeout, dtsp);
1558 }
1559 }
1560 vtyp = IFTOVT(feo->attr.mode);
1561 }
1562 if (lookup_err && (!fdi.answ_stat || lookup_err != ENOENT)) {
1563 fdisp_destroy(&fdi);
1564 return lookup_err;
1565 }
1566 }
1567 /* lookup_err, if non-zero, must be ENOENT at this point */
1568
1569 if (lookup_err) {
1570 /* Entry not found */
1571 if ((nameiop == CREATE || nameiop == RENAME) && islastcn) {
1572 if (default_permissions)
1573 err = fuse_internal_access(dvp, VWRITE, td,
1574 cred);
1575 else
1576 err = 0;
1577 if (!err) {
1578 err = EJUSTRETURN;
1579 }
1580 } else {
1581 err = ENOENT;
1582 }
1583 } else {
1584 /* Entry was found */
1585 if (isdotdot) {
1586 struct fuse_lookup_alloc_arg flaa;
1587
1588 flaa.nid = nid;
1589 flaa.feo = feo;
1590 flaa.cnp = cnp;
1591 flaa.vtyp = vtyp;
1592 err = vn_vget_ino_gen(dvp, fuse_lookup_alloc, &flaa, 0,
1593 &vp);
1594 *vpp = vp;
1595 } else if (nid == VTOI(dvp)) {
1596 if (is_dot) {
1597 vref(dvp);
1598 *vpp = dvp;
1599 } else {
1600 fuse_warn(fuse_get_mpdata(mp),
1601 FSESS_WARN_ILLEGAL_INODE,
1602 "Assigned same inode to both parent and "
1603 "child.");
1604 err = EIO;
1605 }
1606
1607 } else {
1608 struct fuse_vnode_data *fvdat;
1609
1610 err = fuse_vnode_get(vnode_mount(dvp), feo, nid, dvp,
1611 &vp, cnp, vtyp);
1612 if (err)
1613 goto out;
1614 *vpp = vp;
1615 fvdat = VTOFUD(vp);
1616
1617 MPASS(feo != NULL);
1618 if (timespeccmp(&now, &fvdat->last_local_modify, >)) {
1619 /*
1620 * Attributes from the server are definitely
1621 * newer than the last attributes we sent to
1622 * the server, so cache them.
1623 */
1624 fuse_internal_cache_attrs(*vpp, &feo->attr,
1625 feo->attr_valid, feo->attr_valid_nsec,
1626 NULL, true);
1627 }
1628 fuse_validity_2_bintime(feo->entry_valid,
1629 feo->entry_valid_nsec,
1630 &fvdat->entry_cache_timeout);
1631
1632 if ((nameiop == DELETE || nameiop == RENAME) &&
1633 islastcn && default_permissions)
1634 {
1635 struct vattr dvattr;
1636
1637 err = fuse_internal_access(dvp, VWRITE, td,
1638 cred);
1639 if (err != 0)
1640 goto out;
1641 /*
1642 * if the parent's sticky bit is set, check
1643 * whether we're allowed to remove the file.
1644 * Need to figure out the vnode locking to make
1645 * this work.
1646 */
1647 fuse_internal_getattr(dvp, &dvattr, cred, td);
1648 if ((dvattr.va_mode & S_ISTXT) &&
1649 fuse_internal_access(dvp, VADMIN, td,
1650 cred) &&
1651 fuse_internal_access(*vpp, VADMIN, td,
1652 cred)) {
1653 err = EPERM;
1654 goto out;
1655 }
1656 }
1657 }
1658 }
1659 out:
1660 if (err) {
1661 if (vp != NULL && dvp != vp)
1662 vput(vp);
1663 else if (vp != NULL)
1664 vrele(vp);
1665 *vpp = NULL;
1666 }
1667 if (did_lookup)
1668 fdisp_destroy(&fdi);
1669
1670 return err;
1671 }
1672
1673 /*
1674 struct vnop_mkdir_args {
1675 struct vnode *a_dvp;
1676 struct vnode **a_vpp;
1677 struct componentname *a_cnp;
1678 struct vattr *a_vap;
1679 };
1680 */
1681 static int
fuse_vnop_mkdir(struct vop_mkdir_args * ap)1682 fuse_vnop_mkdir(struct vop_mkdir_args *ap)
1683 {
1684 struct vnode *dvp = ap->a_dvp;
1685 struct vnode **vpp = ap->a_vpp;
1686 struct componentname *cnp = ap->a_cnp;
1687 struct vattr *vap = ap->a_vap;
1688
1689 struct fuse_mkdir_in fmdi;
1690
1691 if (fuse_isdeadfs(dvp)) {
1692 return ENXIO;
1693 }
1694 fmdi.mode = MAKEIMODE(vap->va_type, vap->va_mode);
1695 fmdi.umask = curthread->td_proc->p_pd->pd_cmask;
1696
1697 return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKDIR, &fmdi,
1698 sizeof(fmdi), VDIR));
1699 }
1700
1701 /*
1702 struct vnop_mknod_args {
1703 struct vnode *a_dvp;
1704 struct vnode **a_vpp;
1705 struct componentname *a_cnp;
1706 struct vattr *a_vap;
1707 };
1708 */
1709 static int
fuse_vnop_mknod(struct vop_mknod_args * ap)1710 fuse_vnop_mknod(struct vop_mknod_args *ap)
1711 {
1712
1713 struct vnode *dvp = ap->a_dvp;
1714 struct vnode **vpp = ap->a_vpp;
1715 struct componentname *cnp = ap->a_cnp;
1716 struct vattr *vap = ap->a_vap;
1717
1718 if (fuse_isdeadfs(dvp))
1719 return ENXIO;
1720
1721 return fuse_internal_mknod(dvp, vpp, cnp, vap);
1722 }
1723
1724 /*
1725 struct vop_open_args {
1726 struct vnode *a_vp;
1727 int a_mode;
1728 struct ucred *a_cred;
1729 struct thread *a_td;
1730 int a_fdidx; / struct file *a_fp;
1731 };
1732 */
1733 static int
fuse_vnop_open(struct vop_open_args * ap)1734 fuse_vnop_open(struct vop_open_args *ap)
1735 {
1736 struct vnode *vp = ap->a_vp;
1737 int a_mode = ap->a_mode;
1738 struct thread *td = ap->a_td;
1739 struct ucred *cred = ap->a_cred;
1740 pid_t pid = td->td_proc->p_pid;
1741
1742 if (fuse_isdeadfs(vp))
1743 return ENXIO;
1744 if (vp->v_type == VCHR || vp->v_type == VBLK || vp->v_type == VFIFO)
1745 return (EOPNOTSUPP);
1746 if ((a_mode & (FREAD | FWRITE | FEXEC)) == 0)
1747 return EINVAL;
1748
1749 if (fuse_filehandle_validrw(vp, a_mode, cred, pid)) {
1750 fuse_vnode_open(vp, 0, td);
1751 return 0;
1752 }
1753
1754 return fuse_filehandle_open(vp, a_mode, NULL, td, cred);
1755 }
1756
1757 static int
fuse_vnop_pathconf(struct vop_pathconf_args * ap)1758 fuse_vnop_pathconf(struct vop_pathconf_args *ap)
1759 {
1760 struct vnode *vp = ap->a_vp;
1761 struct mount *mp;
1762 struct fuse_filehandle *fufh;
1763 int err;
1764 bool closefufh = false;
1765
1766 switch (ap->a_name) {
1767 case _PC_FILESIZEBITS:
1768 *ap->a_retval = 64;
1769 return (0);
1770 case _PC_NAME_MAX:
1771 *ap->a_retval = NAME_MAX;
1772 return (0);
1773 case _PC_LINK_MAX:
1774 *ap->a_retval = MIN(LONG_MAX, FUSE_LINK_MAX);
1775 return (0);
1776 case _PC_SYMLINK_MAX:
1777 *ap->a_retval = MAXPATHLEN;
1778 return (0);
1779 case _PC_NO_TRUNC:
1780 *ap->a_retval = 1;
1781 return (0);
1782 case _PC_MIN_HOLE_SIZE:
1783 /*
1784 * The FUSE protocol provides no mechanism for a server to
1785 * report _PC_MIN_HOLE_SIZE. It's a protocol bug. Instead,
1786 * return EINVAL if the server does not support FUSE_LSEEK, or
1787 * 1 if it does.
1788 */
1789 mp = vnode_mount(vp);
1790 if (!fsess_is_impl(mp, FUSE_LSEEK) &&
1791 !fsess_not_impl(mp, FUSE_LSEEK)) {
1792 off_t offset = 0;
1793
1794 /*
1795 * Issue a FUSE_LSEEK to find out if it's supported.
1796 * Use SEEK_DATA instead of SEEK_HOLE, because the
1797 * latter generally requires sequential scans of file
1798 * metadata, which can be slow.
1799 */
1800 err = fuse_vnop_do_lseek(vp, curthread,
1801 curthread->td_ucred, curthread->td_proc->p_pid,
1802 &offset, SEEK_DATA);
1803 if (err == EBADF) {
1804 /*
1805 * pathconf() doesn't necessarily open the
1806 * file. So we may need to do it here.
1807 */
1808 err = fuse_filehandle_open(vp, FREAD, &fufh,
1809 curthread, curthread->td_ucred);
1810 if (err == 0) {
1811 closefufh = true;
1812 err = fuse_vnop_do_lseek(vp, curthread,
1813 curthread->td_ucred,
1814 curthread->td_proc->p_pid, &offset,
1815 SEEK_DATA);
1816 }
1817 if (closefufh)
1818 fuse_filehandle_close(vp, fufh,
1819 curthread, curthread->td_ucred);
1820 }
1821
1822 }
1823
1824 if (fsess_is_impl(mp, FUSE_LSEEK)) {
1825 *ap->a_retval = 1;
1826 return (0);
1827 } else if (fsess_not_impl(mp, FUSE_LSEEK)) {
1828 /* FUSE_LSEEK is not implemented */
1829 return (EINVAL);
1830 } else {
1831 return (err);
1832 }
1833 default:
1834 return (vop_stdpathconf(ap));
1835 }
1836 }
1837
1838 SDT_PROBE_DEFINE3(fusefs, , vnops, filehandles_closed, "struct vnode*",
1839 "struct uio*", "struct ucred*");
1840 /*
1841 struct vnop_read_args {
1842 struct vnode *a_vp;
1843 struct uio *a_uio;
1844 int a_ioflag;
1845 struct ucred *a_cred;
1846 };
1847 */
1848 static int
fuse_vnop_read(struct vop_read_args * ap)1849 fuse_vnop_read(struct vop_read_args *ap)
1850 {
1851 struct vnode *vp = ap->a_vp;
1852 struct uio *uio = ap->a_uio;
1853 int ioflag = ap->a_ioflag;
1854 struct ucred *cred = ap->a_cred;
1855 pid_t pid = curthread->td_proc->p_pid;
1856 struct fuse_filehandle *fufh;
1857 int err;
1858 bool closefufh = false, directio;
1859
1860 MPASS(vp->v_type == VREG || vp->v_type == VDIR);
1861
1862 if (fuse_isdeadfs(vp)) {
1863 return ENXIO;
1864 }
1865
1866 if (VTOFUD(vp)->flag & FN_DIRECTIO) {
1867 ioflag |= IO_DIRECT;
1868 }
1869
1870 err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid);
1871 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
1872 /*
1873 * nfsd will do I/O without first doing VOP_OPEN. We
1874 * must implicitly open the file here
1875 */
1876 err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred);
1877 closefufh = true;
1878 }
1879 if (err) {
1880 SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred);
1881 return err;
1882 }
1883
1884 /*
1885 * Ideally, when the daemon asks for direct io at open time, the
1886 * standard file flag should be set according to this, so that would
1887 * just change the default mode, which later on could be changed via
1888 * fcntl(2).
1889 * But this doesn't work, the O_DIRECT flag gets cleared at some point
1890 * (don't know where). So to make any use of the Fuse direct_io option,
1891 * we hardwire it into the file's private data (similarly to Linux,
1892 * btw.).
1893 */
1894 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
1895
1896 fuse_vnode_update(vp, FN_ATIMECHANGE);
1897 if (directio) {
1898 SDT_PROBE2(fusefs, , vnops, trace, 1, "direct read of vnode");
1899 err = fuse_read_directbackend(vp, uio, cred, fufh);
1900 } else {
1901 SDT_PROBE2(fusefs, , vnops, trace, 1, "buffered read of vnode");
1902 err = fuse_read_biobackend(vp, uio, ioflag, cred, fufh, pid);
1903 }
1904
1905 if (closefufh)
1906 fuse_filehandle_close(vp, fufh, curthread, cred);
1907
1908 return (err);
1909 }
1910
1911 /*
1912 struct vnop_readdir_args {
1913 struct vnode *a_vp;
1914 struct uio *a_uio;
1915 struct ucred *a_cred;
1916 int *a_eofflag;
1917 int *a_ncookies;
1918 uint64_t **a_cookies;
1919 };
1920 */
1921 static int
fuse_vnop_readdir(struct vop_readdir_args * ap)1922 fuse_vnop_readdir(struct vop_readdir_args *ap)
1923 {
1924 struct vnode *vp = ap->a_vp;
1925 struct uio *uio = ap->a_uio;
1926 struct ucred *cred = ap->a_cred;
1927 struct fuse_filehandle *fufh = NULL;
1928 struct mount *mp = vnode_mount(vp);
1929 struct fuse_iov cookediov;
1930 int err = 0;
1931 uint64_t *cookies;
1932 ssize_t tresid;
1933 int ncookies;
1934 bool closefufh = false;
1935 pid_t pid = curthread->td_proc->p_pid;
1936
1937 if (ap->a_eofflag)
1938 *ap->a_eofflag = 0;
1939 if (fuse_isdeadfs(vp)) {
1940 return ENXIO;
1941 }
1942 if (uio_resid(uio) < sizeof(struct dirent))
1943 return EINVAL;
1944
1945 tresid = uio->uio_resid;
1946 err = fuse_filehandle_get_dir(vp, &fufh, cred, pid);
1947 if (err == EBADF && mp->mnt_flag & MNT_EXPORTED) {
1948 KASSERT(!fsess_is_impl(mp, FUSE_OPENDIR),
1949 ("FUSE file systems that implement "
1950 "FUSE_OPENDIR should not be exported"));
1951 /*
1952 * nfsd will do VOP_READDIR without first doing VOP_OPEN. We
1953 * must implicitly open the directory here.
1954 */
1955 err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred);
1956 closefufh = true;
1957 }
1958 if (err)
1959 return (err);
1960 if (ap->a_ncookies != NULL) {
1961 ncookies = uio->uio_resid /
1962 (offsetof(struct dirent, d_name) + 4) + 1;
1963 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
1964 *ap->a_ncookies = ncookies;
1965 *ap->a_cookies = cookies;
1966 } else {
1967 ncookies = 0;
1968 cookies = NULL;
1969 }
1970 #define DIRCOOKEDSIZE FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + MAXNAMLEN + 1)
1971 fiov_init(&cookediov, DIRCOOKEDSIZE);
1972
1973 err = fuse_internal_readdir(vp, uio, fufh, &cookediov,
1974 &ncookies, cookies);
1975
1976 fiov_teardown(&cookediov);
1977 if (closefufh)
1978 fuse_filehandle_close(vp, fufh, curthread, cred);
1979
1980 if (ap->a_ncookies != NULL) {
1981 if (err == 0) {
1982 *ap->a_ncookies -= ncookies;
1983 } else {
1984 free(*ap->a_cookies, M_TEMP);
1985 *ap->a_ncookies = 0;
1986 *ap->a_cookies = NULL;
1987 }
1988 }
1989 if (err == 0 && tresid == uio->uio_resid)
1990 *ap->a_eofflag = 1;
1991
1992 return err;
1993 }
1994
1995 /*
1996 struct vnop_readlink_args {
1997 struct vnode *a_vp;
1998 struct uio *a_uio;
1999 struct ucred *a_cred;
2000 };
2001 */
2002 static int
fuse_vnop_readlink(struct vop_readlink_args * ap)2003 fuse_vnop_readlink(struct vop_readlink_args *ap)
2004 {
2005 struct vnode *vp = ap->a_vp;
2006 struct uio *uio = ap->a_uio;
2007 struct ucred *cred = ap->a_cred;
2008
2009 struct fuse_dispatcher fdi;
2010 int err;
2011
2012 if (fuse_isdeadfs(vp)) {
2013 return ENXIO;
2014 }
2015 if (!vnode_islnk(vp)) {
2016 return EINVAL;
2017 }
2018 fdisp_init(&fdi, 0);
2019 err = fdisp_simple_putget_vp(&fdi, FUSE_READLINK, vp, curthread, cred);
2020 if (err) {
2021 goto out;
2022 }
2023 if (strnlen(fdi.answ, fdi.iosize) + 1 < fdi.iosize) {
2024 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
2025 fuse_warn(data, FSESS_WARN_READLINK_EMBEDDED_NUL,
2026 "Returned an embedded NUL from FUSE_READLINK.");
2027 err = EIO;
2028 goto out;
2029 }
2030 if (((char *)fdi.answ)[0] == '/' &&
2031 fuse_get_mpdata(vnode_mount(vp))->dataflags & FSESS_PUSH_SYMLINKS_IN) {
2032 char *mpth = vnode_mount(vp)->mnt_stat.f_mntonname;
2033
2034 err = uiomove(mpth, strlen(mpth), uio);
2035 }
2036 if (!err) {
2037 err = uiomove(fdi.answ, fdi.iosize, uio);
2038 }
2039 out:
2040 fdisp_destroy(&fdi);
2041 return err;
2042 }
2043
2044 /*
2045 struct vnop_reclaim_args {
2046 struct vnode *a_vp;
2047 };
2048 */
2049 static int
fuse_vnop_reclaim(struct vop_reclaim_args * ap)2050 fuse_vnop_reclaim(struct vop_reclaim_args *ap)
2051 {
2052 struct vnode *vp = ap->a_vp;
2053 struct thread *td = curthread;
2054 struct fuse_vnode_data *fvdat = VTOFUD(vp);
2055 struct fuse_filehandle *fufh, *fufh_tmp;
2056
2057 if (!fvdat) {
2058 panic("FUSE: no vnode data during recycling");
2059 }
2060 LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) {
2061 printf("FUSE: vnode being reclaimed with open fufh "
2062 "(type=%#x)", fufh->fufh_type);
2063 fuse_filehandle_close(vp, fufh, td, NULL);
2064 }
2065
2066 if (VTOI(vp) == 1) {
2067 /*
2068 * Don't send FUSE_FORGET for the root inode, because
2069 * we never send FUSE_LOOKUP for it (see
2070 * fuse_vfsop_root) and we don't want the server to see
2071 * mismatched lookup counts.
2072 */
2073 struct fuse_data *data;
2074 struct vnode *vroot;
2075
2076 data = fuse_get_mpdata(vnode_mount(vp));
2077 FUSE_LOCK();
2078 vroot = data->vroot;
2079 data->vroot = NULL;
2080 FUSE_UNLOCK();
2081 if (vroot)
2082 vrele(vroot);
2083 } else if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) {
2084 fuse_internal_forget_send(vnode_mount(vp), td, NULL, VTOI(vp),
2085 fvdat->nlookup);
2086 }
2087 cache_purge(vp);
2088 vfs_hash_remove(vp);
2089 fuse_vnode_destroy(vp);
2090
2091 return 0;
2092 }
2093
2094 /*
2095 struct vnop_remove_args {
2096 struct vnode *a_dvp;
2097 struct vnode *a_vp;
2098 struct componentname *a_cnp;
2099 };
2100 */
2101 static int
fuse_vnop_remove(struct vop_remove_args * ap)2102 fuse_vnop_remove(struct vop_remove_args *ap)
2103 {
2104 struct vnode *dvp = ap->a_dvp;
2105 struct vnode *vp = ap->a_vp;
2106 struct componentname *cnp = ap->a_cnp;
2107
2108 int err;
2109
2110 if (fuse_isdeadfs(vp)) {
2111 return ENXIO;
2112 }
2113 if (vnode_isdir(vp)) {
2114 return EPERM;
2115 }
2116
2117 err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK);
2118
2119 return err;
2120 }
2121
2122 /*
2123 struct vnop_rename_args {
2124 struct vnode *a_fdvp;
2125 struct vnode *a_fvp;
2126 struct componentname *a_fcnp;
2127 struct vnode *a_tdvp;
2128 struct vnode *a_tvp;
2129 struct componentname *a_tcnp;
2130 };
2131 */
2132 static int
fuse_vnop_rename(struct vop_rename_args * ap)2133 fuse_vnop_rename(struct vop_rename_args *ap)
2134 {
2135 struct vnode *fdvp = ap->a_fdvp;
2136 struct vnode *fvp = ap->a_fvp;
2137 struct componentname *fcnp = ap->a_fcnp;
2138 struct vnode *tdvp = ap->a_tdvp;
2139 struct vnode *tvp = ap->a_tvp;
2140 struct componentname *tcnp = ap->a_tcnp;
2141 struct fuse_data *data;
2142 bool newparent = fdvp != tdvp;
2143 bool isdir = fvp->v_type == VDIR;
2144 int err = 0;
2145
2146 if (fuse_isdeadfs(fdvp)) {
2147 return ENXIO;
2148 }
2149 if (fvp->v_mount != tdvp->v_mount ||
2150 (tvp && fvp->v_mount != tvp->v_mount)) {
2151 SDT_PROBE2(fusefs, , vnops, trace, 1, "cross-device rename");
2152 err = EXDEV;
2153 goto out;
2154 }
2155 cache_purge(fvp);
2156
2157 /*
2158 * FUSE library is expected to check if target directory is not
2159 * under the source directory in the file system tree.
2160 * Linux performs this check at VFS level.
2161 */
2162 /*
2163 * If source is a directory, and it will get a new parent, user must
2164 * have write permission to it, so ".." can be modified.
2165 */
2166 data = fuse_get_mpdata(vnode_mount(tdvp));
2167 if (data->dataflags & FSESS_DEFAULT_PERMISSIONS && isdir && newparent) {
2168 err = fuse_internal_access(fvp, VWRITE,
2169 curthread, tcnp->cn_cred);
2170 if (err)
2171 goto out;
2172 }
2173 sx_xlock(&data->rename_lock);
2174 err = fuse_internal_rename(fdvp, fcnp, tdvp, tcnp);
2175 if (err == 0) {
2176 if (tdvp != fdvp)
2177 fuse_vnode_setparent(fvp, tdvp);
2178 if (tvp != NULL)
2179 fuse_vnode_setparent(tvp, NULL);
2180 }
2181 sx_unlock(&data->rename_lock);
2182
2183 if (tvp != NULL && tvp != fvp) {
2184 cache_purge(tvp);
2185 }
2186 if (vnode_isdir(fvp)) {
2187 if (((tvp != NULL) && vnode_isdir(tvp)) || vnode_isdir(fvp)) {
2188 cache_purge(tdvp);
2189 }
2190 cache_purge(fdvp);
2191 }
2192 out:
2193 if (tdvp == tvp) {
2194 vrele(tdvp);
2195 } else {
2196 vput(tdvp);
2197 }
2198 if (tvp != NULL) {
2199 vput(tvp);
2200 }
2201 vrele(fdvp);
2202 vrele(fvp);
2203
2204 return err;
2205 }
2206
2207 /*
2208 struct vnop_rmdir_args {
2209 struct vnode *a_dvp;
2210 struct vnode *a_vp;
2211 struct componentname *a_cnp;
2212 } *ap;
2213 */
2214 static int
fuse_vnop_rmdir(struct vop_rmdir_args * ap)2215 fuse_vnop_rmdir(struct vop_rmdir_args *ap)
2216 {
2217 struct vnode *dvp = ap->a_dvp;
2218 struct vnode *vp = ap->a_vp;
2219
2220 int err;
2221
2222 if (fuse_isdeadfs(vp)) {
2223 return ENXIO;
2224 }
2225 if (VTOFUD(vp) == VTOFUD(dvp)) {
2226 return EINVAL;
2227 }
2228 err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR);
2229
2230 return err;
2231 }
2232
2233 /*
2234 struct vnop_setattr_args {
2235 struct vnode *a_vp;
2236 struct vattr *a_vap;
2237 struct ucred *a_cred;
2238 struct thread *a_td;
2239 };
2240 */
2241 static int
fuse_vnop_setattr(struct vop_setattr_args * ap)2242 fuse_vnop_setattr(struct vop_setattr_args *ap)
2243 {
2244 struct vnode *vp = ap->a_vp;
2245 struct vattr *vap = ap->a_vap;
2246 struct ucred *cred = ap->a_cred;
2247 struct thread *td = curthread;
2248 struct mount *mp;
2249 struct fuse_data *data;
2250 struct vattr old_va;
2251 int dataflags;
2252 int err = 0, err2;
2253 accmode_t accmode = 0;
2254 bool checkperm;
2255 bool drop_suid = false;
2256
2257 mp = vnode_mount(vp);
2258 data = fuse_get_mpdata(mp);
2259 dataflags = data->dataflags;
2260 checkperm = dataflags & FSESS_DEFAULT_PERMISSIONS;
2261
2262 if (fuse_isdeadfs(vp)) {
2263 return ENXIO;
2264 }
2265
2266 if (vap->va_uid != (uid_t)VNOVAL) {
2267 if (checkperm) {
2268 /* Only root may change a file's owner */
2269 err = priv_check_cred(cred, PRIV_VFS_CHOWN);
2270 if (err) {
2271 /* As a special case, allow the null chown */
2272 err2 = fuse_internal_getattr(vp, &old_va, cred,
2273 td);
2274 if (err2)
2275 return (err2);
2276 if (vap->va_uid != old_va.va_uid)
2277 return err;
2278 drop_suid = true;
2279 }
2280 }
2281 accmode |= VADMIN;
2282 }
2283 if (vap->va_gid != (gid_t)VNOVAL) {
2284 if (checkperm && priv_check_cred(cred, PRIV_VFS_CHOWN))
2285 drop_suid = true;
2286 if (checkperm && !groupmember(vap->va_gid, cred)) {
2287 /*
2288 * Non-root users may only chgrp to one of their own
2289 * groups
2290 */
2291 err = priv_check_cred(cred, PRIV_VFS_CHOWN);
2292 if (err) {
2293 /* As a special case, allow the null chgrp */
2294 err2 = fuse_internal_getattr(vp, &old_va, cred,
2295 td);
2296 if (err2)
2297 return (err2);
2298 if (vap->va_gid != old_va.va_gid)
2299 return err;
2300 }
2301 }
2302 accmode |= VADMIN;
2303 }
2304 if (vap->va_size != VNOVAL) {
2305 switch (vp->v_type) {
2306 case VDIR:
2307 return (EISDIR);
2308 case VLNK:
2309 case VREG:
2310 if (vfs_isrdonly(mp))
2311 return (EROFS);
2312 err = vn_rlimit_trunc(vap->va_size, td);
2313 if (err)
2314 return (err);
2315 break;
2316 default:
2317 /*
2318 * According to POSIX, the result is unspecified
2319 * for file types other than regular files,
2320 * directories and shared memory objects. We
2321 * don't support shared memory objects in the file
2322 * system, and have dubious support for truncating
2323 * symlinks. Just ignore the request in other cases.
2324 */
2325 return (0);
2326 }
2327 /* Don't set accmode. Permission to trunc is checked upstack */
2328 }
2329 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
2330 if (vap->va_vaflags & VA_UTIMES_NULL)
2331 accmode |= VWRITE;
2332 else
2333 accmode |= VADMIN;
2334 }
2335 if (drop_suid) {
2336 if (vap->va_mode != (mode_t)VNOVAL)
2337 vap->va_mode &= ~(S_ISUID | S_ISGID);
2338 else {
2339 err = fuse_internal_getattr(vp, &old_va, cred, td);
2340 if (err)
2341 return (err);
2342 vap->va_mode = old_va.va_mode & ~(S_ISUID | S_ISGID);
2343 }
2344 }
2345 if (vap->va_mode != (mode_t)VNOVAL) {
2346 /* Only root may set the sticky bit on non-directories */
2347 if (checkperm && vp->v_type != VDIR && (vap->va_mode & S_ISTXT)
2348 && priv_check_cred(cred, PRIV_VFS_STICKYFILE))
2349 return EFTYPE;
2350 if (checkperm && (vap->va_mode & S_ISGID)) {
2351 err = fuse_internal_getattr(vp, &old_va, cred, td);
2352 if (err)
2353 return (err);
2354 if (!groupmember(old_va.va_gid, cred)) {
2355 err = priv_check_cred(cred, PRIV_VFS_SETGID);
2356 if (err)
2357 return (err);
2358 }
2359 }
2360 accmode |= VADMIN;
2361 }
2362
2363 if (vfs_isrdonly(mp))
2364 return EROFS;
2365
2366 if (checkperm) {
2367 err = fuse_internal_access(vp, accmode, td, cred);
2368 } else {
2369 err = 0;
2370 }
2371 if (err)
2372 return err;
2373 else
2374 return fuse_internal_setattr(vp, vap, td, cred);
2375 }
2376
2377 /*
2378 struct vnop_strategy_args {
2379 struct vnode *a_vp;
2380 struct buf *a_bp;
2381 };
2382 */
2383 static int
fuse_vnop_strategy(struct vop_strategy_args * ap)2384 fuse_vnop_strategy(struct vop_strategy_args *ap)
2385 {
2386 struct vnode *vp = ap->a_vp;
2387 struct buf *bp = ap->a_bp;
2388
2389 if (!vp || fuse_isdeadfs(vp)) {
2390 bp->b_ioflags |= BIO_ERROR;
2391 bp->b_error = ENXIO;
2392 bufdone(bp);
2393 return 0;
2394 }
2395
2396 /*
2397 * VOP_STRATEGY always returns zero and signals error via bp->b_ioflags.
2398 * fuse_io_strategy sets bp's error fields
2399 */
2400 (void)fuse_io_strategy(vp, bp);
2401
2402 return 0;
2403 }
2404
2405 /*
2406 struct vnop_symlink_args {
2407 struct vnode *a_dvp;
2408 struct vnode **a_vpp;
2409 struct componentname *a_cnp;
2410 struct vattr *a_vap;
2411 char *a_target;
2412 };
2413 */
2414 static int
fuse_vnop_symlink(struct vop_symlink_args * ap)2415 fuse_vnop_symlink(struct vop_symlink_args *ap)
2416 {
2417 struct vnode *dvp = ap->a_dvp;
2418 struct vnode **vpp = ap->a_vpp;
2419 struct componentname *cnp = ap->a_cnp;
2420 const char *target = ap->a_target;
2421
2422 struct fuse_dispatcher fdi;
2423
2424 int err;
2425 size_t len;
2426
2427 if (fuse_isdeadfs(dvp)) {
2428 return ENXIO;
2429 }
2430 /*
2431 * Unlike the other creator type calls, here we have to create a message
2432 * where the name of the new entry comes first, and the data describing
2433 * the entry comes second.
2434 * Hence we can't rely on our handy fuse_internal_newentry() routine,
2435 * but put together the message manually and just call the core part.
2436 */
2437
2438 len = strlen(target) + 1;
2439 fdisp_init(&fdi, len + cnp->cn_namelen + 1);
2440 fdisp_make_vp(&fdi, FUSE_SYMLINK, dvp, curthread, NULL);
2441
2442 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
2443 ((char *)fdi.indata)[cnp->cn_namelen] = '\0';
2444 memcpy((char *)fdi.indata + cnp->cn_namelen + 1, target, len);
2445
2446 err = fuse_internal_newentry_core(dvp, vpp, cnp, VLNK, &fdi);
2447 fdisp_destroy(&fdi);
2448 return err;
2449 }
2450
2451 /*
2452 struct vnop_write_args {
2453 struct vnode *a_vp;
2454 struct uio *a_uio;
2455 int a_ioflag;
2456 struct ucred *a_cred;
2457 };
2458 */
2459 static int
fuse_vnop_write(struct vop_write_args * ap)2460 fuse_vnop_write(struct vop_write_args *ap)
2461 {
2462 struct vnode *vp = ap->a_vp;
2463 struct uio *uio = ap->a_uio;
2464 int ioflag = ap->a_ioflag;
2465 struct ucred *cred = ap->a_cred;
2466 pid_t pid = curthread->td_proc->p_pid;
2467 struct fuse_filehandle *fufh;
2468 int err;
2469 bool closefufh = false, directio;
2470
2471 MPASS(vp->v_type == VREG || vp->v_type == VDIR);
2472
2473 if (fuse_isdeadfs(vp)) {
2474 return ENXIO;
2475 }
2476
2477 if (VTOFUD(vp)->flag & FN_DIRECTIO) {
2478 ioflag |= IO_DIRECT;
2479 }
2480
2481 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
2482 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
2483 /*
2484 * nfsd will do I/O without first doing VOP_OPEN. We
2485 * must implicitly open the file here
2486 */
2487 err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred);
2488 closefufh = true;
2489 }
2490 if (err) {
2491 SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred);
2492 return err;
2493 }
2494
2495 /*
2496 * Ideally, when the daemon asks for direct io at open time, the
2497 * standard file flag should be set according to this, so that would
2498 * just change the default mode, which later on could be changed via
2499 * fcntl(2).
2500 * But this doesn't work, the O_DIRECT flag gets cleared at some point
2501 * (don't know where). So to make any use of the Fuse direct_io option,
2502 * we hardwire it into the file's private data (similarly to Linux,
2503 * btw.).
2504 */
2505 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
2506
2507 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE);
2508 if (directio) {
2509 off_t start, end, filesize;
2510 bool pages = (ioflag & IO_VMIO) != 0;
2511
2512 SDT_PROBE2(fusefs, , vnops, trace, 1, "direct write of vnode");
2513
2514 err = fuse_vnode_size(vp, &filesize, cred, curthread);
2515 if (err)
2516 goto out;
2517
2518 start = uio->uio_offset;
2519 end = start + uio->uio_resid;
2520 if (!pages) {
2521 err = fuse_inval_buf_range(vp, filesize, start,
2522 end);
2523 if (err)
2524 goto out;
2525 }
2526 err = fuse_write_directbackend(vp, uio, cred, fufh,
2527 filesize, ioflag, pages);
2528 } else {
2529 SDT_PROBE2(fusefs, , vnops, trace, 1,
2530 "buffered write of vnode");
2531 if (!fsess_opt_writeback(vnode_mount(vp)))
2532 ioflag |= IO_SYNC;
2533 err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag, pid);
2534 }
2535 fuse_internal_clear_suid_on_write(vp, cred, uio->uio_td);
2536
2537 out:
2538 if (closefufh)
2539 fuse_filehandle_close(vp, fufh, curthread, cred);
2540
2541 return (err);
2542 }
2543
2544 static daddr_t
fuse_gbp_getblkno(struct vnode * vp,vm_ooffset_t off)2545 fuse_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
2546 {
2547 const int biosize = fuse_iosize(vp);
2548
2549 return (off / biosize);
2550 }
2551
2552 static int
fuse_gbp_getblksz(struct vnode * vp,daddr_t lbn,long * blksz)2553 fuse_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *blksz)
2554 {
2555 off_t filesize;
2556 int err;
2557 const int biosize = fuse_iosize(vp);
2558
2559 err = fuse_vnode_size(vp, &filesize, NULL, NULL);
2560 if (err) {
2561 /* This will turn into a SIGBUS */
2562 return (EIO);
2563 } else if ((off_t)lbn * biosize >= filesize) {
2564 *blksz = 0;
2565 } else if ((off_t)(lbn + 1) * biosize > filesize) {
2566 *blksz = filesize - (off_t)lbn *biosize;
2567 } else {
2568 *blksz = biosize;
2569 }
2570 return (0);
2571 }
2572
2573 /*
2574 struct vnop_getpages_args {
2575 struct vnode *a_vp;
2576 vm_page_t *a_m;
2577 int a_count;
2578 int a_reqpage;
2579 };
2580 */
2581 static int
fuse_vnop_getpages(struct vop_getpages_args * ap)2582 fuse_vnop_getpages(struct vop_getpages_args *ap)
2583 {
2584 struct vnode *vp = ap->a_vp;
2585
2586 if (!fsess_opt_mmap(vnode_mount(vp))) {
2587 SDT_PROBE2(fusefs, , vnops, trace, 1,
2588 "called on non-cacheable vnode??\n");
2589 return (VM_PAGER_ERROR);
2590 }
2591
2592 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind,
2593 ap->a_rahead, fuse_gbp_getblkno, fuse_gbp_getblksz));
2594 }
2595
2596 static const char extattr_namespace_separator = '.';
2597
2598 /*
2599 struct vop_getextattr_args {
2600 struct vop_generic_args a_gen;
2601 struct vnode *a_vp;
2602 int a_attrnamespace;
2603 const char *a_name;
2604 struct uio *a_uio;
2605 size_t *a_size;
2606 struct ucred *a_cred;
2607 struct thread *a_td;
2608 };
2609 */
2610 static int
fuse_vnop_getextattr(struct vop_getextattr_args * ap)2611 fuse_vnop_getextattr(struct vop_getextattr_args *ap)
2612 {
2613 struct vnode *vp = ap->a_vp;
2614 struct uio *uio = ap->a_uio;
2615 struct fuse_dispatcher fdi;
2616 struct fuse_getxattr_in *get_xattr_in;
2617 struct fuse_getxattr_out *get_xattr_out;
2618 struct mount *mp = vnode_mount(vp);
2619 struct thread *td = ap->a_td;
2620 struct ucred *cred = ap->a_cred;
2621 char *prefix;
2622 char *attr_str;
2623 size_t len;
2624 int err;
2625
2626 if (fuse_isdeadfs(vp))
2627 return (ENXIO);
2628
2629 if (fsess_not_impl(mp, FUSE_GETXATTR))
2630 return EOPNOTSUPP;
2631
2632 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
2633 if (err)
2634 return err;
2635
2636 /* Default to looking for user attributes. */
2637 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
2638 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
2639 else
2640 prefix = EXTATTR_NAMESPACE_USER_STRING;
2641
2642 len = strlen(prefix) + sizeof(extattr_namespace_separator) +
2643 strlen(ap->a_name) + 1;
2644
2645 fdisp_init(&fdi, len + sizeof(*get_xattr_in));
2646 fdisp_make_vp(&fdi, FUSE_GETXATTR, vp, td, cred);
2647
2648 get_xattr_in = fdi.indata;
2649 /*
2650 * Check to see whether we're querying the available size or
2651 * issuing the actual request. If we pass in 0, we get back struct
2652 * fuse_getxattr_out. If we pass in a non-zero size, we get back
2653 * that much data, without the struct fuse_getxattr_out header.
2654 */
2655 if (uio == NULL)
2656 get_xattr_in->size = 0;
2657 else
2658 get_xattr_in->size = uio->uio_resid;
2659
2660 attr_str = (char *)fdi.indata + sizeof(*get_xattr_in);
2661 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
2662 ap->a_name);
2663
2664 err = fdisp_wait_answ(&fdi);
2665 if (err != 0) {
2666 if (err == ENOSYS) {
2667 fsess_set_notimpl(mp, FUSE_GETXATTR);
2668 err = EOPNOTSUPP;
2669 }
2670 goto out;
2671 }
2672
2673 get_xattr_out = fdi.answ;
2674
2675 if (ap->a_size != NULL)
2676 *ap->a_size = get_xattr_out->size;
2677
2678 if (uio != NULL)
2679 err = uiomove(fdi.answ, fdi.iosize, uio);
2680
2681 out:
2682 fdisp_destroy(&fdi);
2683 return (err);
2684 }
2685
2686 /*
2687 struct vop_setextattr_args {
2688 struct vop_generic_args a_gen;
2689 struct vnode *a_vp;
2690 int a_attrnamespace;
2691 const char *a_name;
2692 struct uio *a_uio;
2693 struct ucred *a_cred;
2694 struct thread *a_td;
2695 };
2696 */
2697 static int
fuse_vnop_setextattr(struct vop_setextattr_args * ap)2698 fuse_vnop_setextattr(struct vop_setextattr_args *ap)
2699 {
2700 struct vnode *vp = ap->a_vp;
2701 struct uio *uio = ap->a_uio;
2702 struct fuse_dispatcher fdi;
2703 struct fuse_setxattr_in *set_xattr_in;
2704 struct mount *mp = vnode_mount(vp);
2705 struct thread *td = ap->a_td;
2706 struct ucred *cred = ap->a_cred;
2707 size_t struct_size = FUSE_COMPAT_SETXATTR_IN_SIZE;
2708 char *prefix;
2709 size_t len;
2710 char *attr_str;
2711 int err;
2712
2713 if (fuse_isdeadfs(vp))
2714 return (ENXIO);
2715
2716 if (fsess_not_impl(mp, FUSE_SETXATTR))
2717 return EOPNOTSUPP;
2718
2719 if (vfs_isrdonly(mp))
2720 return EROFS;
2721
2722 /* Deleting xattrs must use VOP_DELETEEXTATTR instead */
2723 if (ap->a_uio == NULL) {
2724 /*
2725 * If we got here as fallback from VOP_DELETEEXTATTR, then
2726 * return EOPNOTSUPP.
2727 */
2728 if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
2729 return (EOPNOTSUPP);
2730 else
2731 return (EINVAL);
2732 }
2733
2734 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
2735 VWRITE);
2736 if (err)
2737 return err;
2738
2739 /* Default to looking for user attributes. */
2740 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
2741 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
2742 else
2743 prefix = EXTATTR_NAMESPACE_USER_STRING;
2744
2745 len = strlen(prefix) + sizeof(extattr_namespace_separator) +
2746 strlen(ap->a_name) + 1;
2747
2748 /* older FUSE servers use a smaller fuse_setxattr_in struct*/
2749 if (fuse_libabi_geq(fuse_get_mpdata(mp), 7, 33))
2750 struct_size = sizeof(*set_xattr_in);
2751
2752 fdisp_init(&fdi, len + struct_size + uio->uio_resid);
2753 fdisp_make_vp(&fdi, FUSE_SETXATTR, vp, td, cred);
2754
2755 set_xattr_in = fdi.indata;
2756 set_xattr_in->size = uio->uio_resid;
2757
2758 if (fuse_libabi_geq(fuse_get_mpdata(mp), 7, 33)) {
2759 set_xattr_in->setxattr_flags = 0;
2760 set_xattr_in->padding = 0;
2761 }
2762
2763 attr_str = (char *)fdi.indata + struct_size;
2764 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
2765 ap->a_name);
2766
2767 err = uiomove((char *)fdi.indata + struct_size + len,
2768 uio->uio_resid, uio);
2769 if (err != 0) {
2770 goto out;
2771 }
2772
2773 err = fdisp_wait_answ(&fdi);
2774
2775 if (err == ENOSYS) {
2776 fsess_set_notimpl(mp, FUSE_SETXATTR);
2777 err = EOPNOTSUPP;
2778 }
2779 if (err == ERESTART) {
2780 /* Can't restart after calling uiomove */
2781 err = EINTR;
2782 }
2783
2784 out:
2785 fdisp_destroy(&fdi);
2786 return (err);
2787 }
2788
2789 /*
2790 * The Linux / FUSE extended attribute list is simply a collection of
2791 * NUL-terminated strings. The FreeBSD extended attribute list is a single
2792 * byte length followed by a non-NUL terminated string. So, this allows
2793 * conversion of the Linux / FUSE format to the FreeBSD format in place.
2794 * Linux attribute names are reported with the namespace as a prefix (e.g.
2795 * "user.attribute_name"), but in FreeBSD they are reported without the
2796 * namespace prefix (e.g. "attribute_name"). So, we're going from:
2797 *
2798 * user.attr_name1\0user.attr_name2\0
2799 *
2800 * to:
2801 *
2802 * <num>attr_name1<num>attr_name2
2803 *
2804 * Where "<num>" is a single byte number of characters in the attribute name.
2805 *
2806 * Args:
2807 * prefix - exattr namespace prefix string
2808 * list, list_len - input list with namespace prefixes
2809 * bsd_list, bsd_list_len - output list compatible with bsd vfs
2810 */
2811 static int
fuse_xattrlist_convert(char * prefix,const char * list,int list_len,char * bsd_list,int * bsd_list_len)2812 fuse_xattrlist_convert(char *prefix, const char *list, int list_len,
2813 char *bsd_list, int *bsd_list_len)
2814 {
2815 int len, pos, dist_to_next, prefix_len;
2816
2817 pos = 0;
2818 *bsd_list_len = 0;
2819 prefix_len = strlen(prefix);
2820
2821 while (pos < list_len && list[pos] != '\0') {
2822 dist_to_next = strlen(&list[pos]) + 1;
2823 if (bcmp(&list[pos], prefix, prefix_len) == 0 &&
2824 list[pos + prefix_len] == extattr_namespace_separator) {
2825 len = dist_to_next -
2826 (prefix_len + sizeof(extattr_namespace_separator)) - 1;
2827 if (len >= EXTATTR_MAXNAMELEN)
2828 return (ENAMETOOLONG);
2829
2830 bsd_list[*bsd_list_len] = len;
2831 memcpy(&bsd_list[*bsd_list_len + 1],
2832 &list[pos + prefix_len +
2833 sizeof(extattr_namespace_separator)], len);
2834
2835 *bsd_list_len += len + 1;
2836 }
2837
2838 pos += dist_to_next;
2839 }
2840
2841 return (0);
2842 }
2843
2844 /*
2845 * List extended attributes
2846 *
2847 * The FUSE_LISTXATTR operation is based on Linux's listxattr(2) syscall, which
2848 * has a number of differences compared to its FreeBSD equivalent,
2849 * extattr_list_file:
2850 *
2851 * - FUSE_LISTXATTR returns all extended attributes across all namespaces,
2852 * whereas listxattr(2) only returns attributes for a single namespace
2853 * - FUSE_LISTXATTR prepends each attribute name with "namespace."
2854 * - If the provided buffer is not large enough to hold the result,
2855 * FUSE_LISTXATTR should return ERANGE, whereas listxattr is expected to
2856 * return as many results as will fit.
2857 */
2858 /*
2859 struct vop_listextattr_args {
2860 struct vop_generic_args a_gen;
2861 struct vnode *a_vp;
2862 int a_attrnamespace;
2863 struct uio *a_uio;
2864 size_t *a_size;
2865 struct ucred *a_cred;
2866 struct thread *a_td;
2867 };
2868 */
2869 static int
fuse_vnop_listextattr(struct vop_listextattr_args * ap)2870 fuse_vnop_listextattr(struct vop_listextattr_args *ap)
2871 {
2872 struct vnode *vp = ap->a_vp;
2873 struct uio *uio = ap->a_uio;
2874 struct fuse_dispatcher fdi;
2875 struct fuse_listxattr_in *list_xattr_in;
2876 struct fuse_listxattr_out *list_xattr_out;
2877 struct mount *mp = vnode_mount(vp);
2878 struct thread *td = ap->a_td;
2879 struct ucred *cred = ap->a_cred;
2880 char *prefix;
2881 char *bsd_list = NULL;
2882 char *linux_list;
2883 int bsd_list_len;
2884 int linux_list_len;
2885 int err;
2886
2887 if (fuse_isdeadfs(vp))
2888 return (ENXIO);
2889
2890 if (fsess_not_impl(mp, FUSE_LISTXATTR))
2891 return EOPNOTSUPP;
2892
2893 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
2894 if (err)
2895 return err;
2896
2897 /*
2898 * Add space for a NUL and the period separator if enabled.
2899 * Default to looking for user attributes.
2900 */
2901 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
2902 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
2903 else
2904 prefix = EXTATTR_NAMESPACE_USER_STRING;
2905
2906 fdisp_init(&fdi, sizeof(*list_xattr_in));
2907 fdisp_make_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
2908
2909 /*
2910 * Retrieve Linux / FUSE compatible list size.
2911 */
2912 list_xattr_in = fdi.indata;
2913 list_xattr_in->size = 0;
2914
2915 err = fdisp_wait_answ(&fdi);
2916 if (err != 0) {
2917 if (err == ENOSYS) {
2918 fsess_set_notimpl(mp, FUSE_LISTXATTR);
2919 err = EOPNOTSUPP;
2920 }
2921 goto out;
2922 }
2923
2924 list_xattr_out = fdi.answ;
2925 linux_list_len = list_xattr_out->size;
2926 if (linux_list_len == 0) {
2927 if (ap->a_size != NULL)
2928 *ap->a_size = linux_list_len;
2929 goto out;
2930 }
2931
2932 /*
2933 * Retrieve Linux / FUSE compatible list values.
2934 */
2935 fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
2936 list_xattr_in = fdi.indata;
2937 list_xattr_in->size = linux_list_len;
2938
2939 err = fdisp_wait_answ(&fdi);
2940 if (err == ERANGE) {
2941 /*
2942 * Race detected. The attribute list must've grown since the
2943 * first FUSE_LISTXATTR call. Start over. Go all the way back
2944 * to userland so we can process signals, if necessary, before
2945 * restarting.
2946 */
2947 err = ERESTART;
2948 goto out;
2949 } else if (err != 0)
2950 goto out;
2951
2952 linux_list = fdi.answ;
2953 /* FUSE doesn't allow the server to return more data than requested */
2954 if (fdi.iosize > linux_list_len) {
2955 struct fuse_data *data = fuse_get_mpdata(mp);
2956
2957 fuse_warn(data, FSESS_WARN_LSEXTATTR_LONG,
2958 "server returned "
2959 "more extended attribute data than requested; "
2960 "should've returned ERANGE instead.");
2961 } else {
2962 /* But returning less data is fine */
2963 linux_list_len = fdi.iosize;
2964 }
2965
2966 /*
2967 * Retrieve the BSD compatible list values.
2968 * The Linux / FUSE attribute list format isn't the same
2969 * as FreeBSD's format. So we need to transform it into
2970 * FreeBSD's format before giving it to the user.
2971 */
2972 bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK);
2973 err = fuse_xattrlist_convert(prefix, linux_list, linux_list_len,
2974 bsd_list, &bsd_list_len);
2975 if (err != 0)
2976 goto out;
2977
2978 if (ap->a_size != NULL)
2979 *ap->a_size = bsd_list_len;
2980
2981 if (uio != NULL)
2982 err = uiomove(bsd_list, bsd_list_len, uio);
2983
2984 out:
2985 free(bsd_list, M_TEMP);
2986 fdisp_destroy(&fdi);
2987 return (err);
2988 }
2989
2990 /*
2991 struct vop_deallocate_args {
2992 struct vop_generic_args a_gen;
2993 struct vnode *a_vp;
2994 off_t *a_offset;
2995 off_t *a_len;
2996 int a_flags;
2997 int a_ioflag;
2998 struct ucred *a_cred;
2999 };
3000 */
3001 static int
fuse_vnop_deallocate(struct vop_deallocate_args * ap)3002 fuse_vnop_deallocate(struct vop_deallocate_args *ap)
3003 {
3004 struct vnode *vp = ap->a_vp;
3005 struct mount *mp = vnode_mount(vp);
3006 struct fuse_filehandle *fufh;
3007 struct fuse_dispatcher fdi;
3008 struct fuse_fallocate_in *ffi;
3009 struct ucred *cred = ap->a_cred;
3010 pid_t pid = curthread->td_proc->p_pid;
3011 off_t *len = ap->a_len;
3012 off_t *offset = ap->a_offset;
3013 int ioflag = ap->a_ioflag;
3014 off_t filesize;
3015 int err;
3016 bool closefufh = false;
3017
3018 if (fuse_isdeadfs(vp))
3019 return (ENXIO);
3020
3021 if (vfs_isrdonly(mp))
3022 return (EROFS);
3023
3024 if (fsess_not_impl(mp, FUSE_FALLOCATE))
3025 goto fallback;
3026
3027 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
3028 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
3029 /*
3030 * nfsd will do I/O without first doing VOP_OPEN. We
3031 * must implicitly open the file here
3032 */
3033 err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred);
3034 closefufh = true;
3035 }
3036 if (err)
3037 return (err);
3038
3039 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE);
3040
3041 err = fuse_vnode_size(vp, &filesize, cred, curthread);
3042 if (err)
3043 goto out;
3044 fuse_inval_buf_range(vp, filesize, *offset, *offset + *len);
3045
3046 fdisp_init(&fdi, sizeof(*ffi));
3047 fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred);
3048 ffi = fdi.indata;
3049 ffi->fh = fufh->fh_id;
3050 ffi->offset = *offset;
3051 ffi->length = *len;
3052 /*
3053 * FreeBSD's fspacectl is equivalent to Linux's fallocate with
3054 * mode == FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE
3055 */
3056 ffi->mode = FUSE_FALLOC_FL_PUNCH_HOLE | FUSE_FALLOC_FL_KEEP_SIZE;
3057 err = fdisp_wait_answ(&fdi);
3058
3059 if (err == ENOSYS) {
3060 fdisp_destroy(&fdi);
3061 fsess_set_notimpl(mp, FUSE_FALLOCATE);
3062 goto fallback;
3063 } else if (err == EOPNOTSUPP) {
3064 /*
3065 * The file system server does not support FUSE_FALLOCATE with
3066 * the supplied mode for this particular file.
3067 */
3068 fdisp_destroy(&fdi);
3069 goto fallback;
3070 } else if (!err) {
3071 /*
3072 * Clip the returned offset to EoF. Do it here rather than
3073 * before FUSE_FALLOCATE just in case the kernel's cached file
3074 * size is out of date. Unfortunately, FUSE does not return
3075 * any information about filesize from that operation.
3076 */
3077 *offset = MIN(*offset + *len, filesize);
3078 *len = 0;
3079 fuse_vnode_undirty_cached_timestamps(vp, false);
3080 fuse_internal_clear_suid_on_write(vp, cred, curthread);
3081
3082 if (ioflag & IO_SYNC)
3083 err = fuse_internal_fsync(vp, curthread, MNT_WAIT,
3084 false);
3085 }
3086
3087 fdisp_destroy(&fdi);
3088 out:
3089 if (closefufh)
3090 fuse_filehandle_close(vp, fufh, curthread, cred);
3091
3092 return (err);
3093
3094 fallback:
3095 if (closefufh)
3096 fuse_filehandle_close(vp, fufh, curthread, cred);
3097
3098 return (vop_stddeallocate(ap));
3099 }
3100
3101 /*
3102 struct vop_deleteextattr_args {
3103 struct vop_generic_args a_gen;
3104 struct vnode *a_vp;
3105 int a_attrnamespace;
3106 const char *a_name;
3107 struct ucred *a_cred;
3108 struct thread *a_td;
3109 };
3110 */
3111 static int
fuse_vnop_deleteextattr(struct vop_deleteextattr_args * ap)3112 fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap)
3113 {
3114 struct vnode *vp = ap->a_vp;
3115 struct fuse_dispatcher fdi;
3116 struct mount *mp = vnode_mount(vp);
3117 struct thread *td = ap->a_td;
3118 struct ucred *cred = ap->a_cred;
3119 char *prefix;
3120 size_t len;
3121 char *attr_str;
3122 int err;
3123
3124 if (fuse_isdeadfs(vp))
3125 return (ENXIO);
3126
3127 if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
3128 return EOPNOTSUPP;
3129
3130 if (vfs_isrdonly(mp))
3131 return EROFS;
3132
3133 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
3134 VWRITE);
3135 if (err)
3136 return err;
3137
3138 /* Default to looking for user attributes. */
3139 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
3140 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
3141 else
3142 prefix = EXTATTR_NAMESPACE_USER_STRING;
3143
3144 len = strlen(prefix) + sizeof(extattr_namespace_separator) +
3145 strlen(ap->a_name) + 1;
3146
3147 fdisp_init(&fdi, len);
3148 fdisp_make_vp(&fdi, FUSE_REMOVEXATTR, vp, td, cred);
3149
3150 attr_str = fdi.indata;
3151 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
3152 ap->a_name);
3153
3154 err = fdisp_wait_answ(&fdi);
3155 if (err == ENOSYS) {
3156 fsess_set_notimpl(mp, FUSE_REMOVEXATTR);
3157 err = EOPNOTSUPP;
3158 }
3159
3160 fdisp_destroy(&fdi);
3161 return (err);
3162 }
3163
3164 /*
3165 struct vnop_print_args {
3166 struct vnode *a_vp;
3167 };
3168 */
3169 static int
fuse_vnop_print(struct vop_print_args * ap)3170 fuse_vnop_print(struct vop_print_args *ap)
3171 {
3172 struct fuse_vnode_data *fvdat = VTOFUD(ap->a_vp);
3173
3174 printf("nodeid: %ju, parent nodeid: %ju, nlookup: %ju, flag: %#x\n",
3175 (uintmax_t)VTOILLU(ap->a_vp), (uintmax_t)fvdat->parent_nid,
3176 (uintmax_t)fvdat->nlookup,
3177 fvdat->flag);
3178
3179 return 0;
3180 }
3181
3182 /*
3183 * Get an NFS filehandle for a FUSE file.
3184 *
3185 * This will only work for FUSE file systems that guarantee the uniqueness of
3186 * nodeid:generation, which most don't.
3187 */
3188 /*
3189 vop_vptofh {
3190 IN struct vnode *a_vp;
3191 IN struct fid *a_fhp;
3192 };
3193 */
3194 static int
fuse_vnop_vptofh(struct vop_vptofh_args * ap)3195 fuse_vnop_vptofh(struct vop_vptofh_args *ap)
3196 {
3197 struct vnode *vp = ap->a_vp;
3198 struct fuse_vnode_data *fvdat = VTOFUD(vp);
3199 struct fuse_fid *fhp = (struct fuse_fid *)(ap->a_fhp);
3200 _Static_assert(sizeof(struct fuse_fid) <= sizeof(struct fid),
3201 "FUSE fid type is too big");
3202 struct mount *mp = vnode_mount(vp);
3203 struct fuse_data *data = fuse_get_mpdata(mp);
3204 struct vattr va;
3205 int err;
3206
3207 if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) {
3208 /* NFS requires lookups for "." and ".." */
3209 SDT_PROBE2(fusefs, , vnops, trace, 1,
3210 "VOP_VPTOFH without FUSE_EXPORT_SUPPORT");
3211 return EOPNOTSUPP;
3212 }
3213 if ((mp->mnt_flag & MNT_EXPORTED) &&
3214 fsess_is_impl(mp, FUSE_OPENDIR))
3215 {
3216 /*
3217 * NFS is stateless, so nfsd must reopen a directory on every
3218 * call to VOP_READDIR, passing in the d_off field from the
3219 * final dirent of the previous invocation. But if the server
3220 * implements FUSE_OPENDIR, the FUSE protocol does not
3221 * guarantee that d_off will be valid after a directory is
3222 * closed and reopened. So prohibit exporting FUSE file
3223 * systems that implement FUSE_OPENDIR.
3224 *
3225 * But userspace NFS servers don't have this problem.
3226 */
3227 SDT_PROBE2(fusefs, , vnops, trace, 1,
3228 "VOP_VPTOFH with FUSE_OPENDIR");
3229 return EOPNOTSUPP;
3230 }
3231
3232 err = fuse_internal_getattr(vp, &va, curthread->td_ucred, curthread);
3233 if (err)
3234 return err;
3235
3236 /*ip = VTOI(ap->a_vp);*/
3237 /*ufhp = (struct ufid *)ap->a_fhp;*/
3238 fhp->len = sizeof(struct fuse_fid);
3239 fhp->nid = fvdat->nid;
3240 if (fvdat->generation <= UINT32_MAX)
3241 fhp->gen = fvdat->generation;
3242 else
3243 return EOVERFLOW;
3244 return (0);
3245 }
3246