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