1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
16 * distribution.
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
35 *
36 * Copyright (c) 2019 The FreeBSD Foundation
37 *
38 * Portions of this software were developed by BFF Storage Systems, LLC under
39 * sponsorship from the FreeBSD Foundation.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 *
50 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include <sys/param.h>
64 #include <sys/module.h>
65 #include <sys/systm.h>
66 #include <sys/errno.h>
67 #include <sys/kernel.h>
68 #include <sys/conf.h>
69 #include <sys/filio.h>
70 #include <sys/uio.h>
71 #include <sys/malloc.h>
72 #include <sys/queue.h>
73 #include <sys/limits.h>
74 #include <sys/lock.h>
75 #include <sys/rwlock.h>
76 #include <sys/sx.h>
77 #include <sys/proc.h>
78 #include <sys/mount.h>
79 #include <sys/vnode.h>
80 #include <sys/namei.h>
81 #include <sys/extattr.h>
82 #include <sys/stat.h>
83 #include <sys/unistd.h>
84 #include <sys/filedesc.h>
85 #include <sys/file.h>
86 #include <sys/fcntl.h>
87 #include <sys/dirent.h>
88 #include <sys/bio.h>
89 #include <sys/buf.h>
90 #include <sys/sysctl.h>
91 #include <sys/vmmeter.h>
92 #define EXTERR_CATEGORY EXTERR_CAT_FUSE
93 #include <sys/exterrvar.h>
94
95 #include <vm/vm.h>
96 #include <vm/vm_extern.h>
97 #include <vm/pmap.h>
98 #include <vm/vm_map.h>
99 #include <vm/vm_page.h>
100 #include <vm/vm_param.h>
101 #include <vm/vm_object.h>
102 #include <vm/vm_pager.h>
103 #include <vm/vnode_pager.h>
104 #include <vm/vm_object.h>
105
106 #include "fuse.h"
107 #include "fuse_file.h"
108 #include "fuse_internal.h"
109 #include "fuse_ipc.h"
110 #include "fuse_node.h"
111 #include "fuse_io.h"
112
113 #include <sys/priv.h>
114
115 /* Maximum number of hardlinks to a single FUSE file */
116 #define FUSE_LINK_MAX UINT32_MAX
117
118 SDT_PROVIDER_DECLARE(fusefs);
119 /*
120 * Fuse trace probe:
121 * arg0: verbosity. Higher numbers give more verbose messages
122 * arg1: Textual message
123 */
124 SDT_PROBE_DEFINE2(fusefs, , vnops, trace, "int", "char*");
125
126 /* vnode ops */
127 static vop_access_t fuse_vnop_access;
128 static vop_advlock_t fuse_vnop_advlock;
129 static vop_allocate_t fuse_vnop_allocate;
130 static vop_bmap_t fuse_vnop_bmap;
131 static vop_close_t fuse_fifo_close;
132 static vop_close_t fuse_vnop_close;
133 static vop_copy_file_range_t fuse_vnop_copy_file_range;
134 static vop_create_t fuse_vnop_create;
135 static vop_deallocate_t fuse_vnop_deallocate;
136 static vop_deleteextattr_t fuse_vnop_deleteextattr;
137 static vop_fdatasync_t fuse_vnop_fdatasync;
138 static vop_fsync_t fuse_vnop_fsync;
139 static vop_getattr_t fuse_vnop_getattr;
140 static vop_getextattr_t fuse_vnop_getextattr;
141 static vop_inactive_t fuse_vnop_inactive;
142 static vop_ioctl_t fuse_vnop_ioctl;
143 static vop_link_t fuse_vnop_link;
144 static vop_listextattr_t fuse_vnop_listextattr;
145 static vop_lookup_t fuse_vnop_lookup;
146 static vop_mkdir_t fuse_vnop_mkdir;
147 static vop_mknod_t fuse_vnop_mknod;
148 static vop_open_t fuse_vnop_open;
149 static vop_pathconf_t fuse_vnop_pathconf;
150 static vop_read_t fuse_vnop_read;
151 static vop_readdir_t fuse_vnop_readdir;
152 static vop_readlink_t fuse_vnop_readlink;
153 static vop_reclaim_t fuse_vnop_reclaim;
154 static vop_remove_t fuse_vnop_remove;
155 static vop_rename_t fuse_vnop_rename;
156 static vop_rmdir_t fuse_vnop_rmdir;
157 static vop_setattr_t fuse_vnop_setattr;
158 static vop_setextattr_t fuse_vnop_setextattr;
159 static vop_strategy_t fuse_vnop_strategy;
160 static vop_symlink_t fuse_vnop_symlink;
161 static vop_write_t fuse_vnop_write;
162 static vop_getpages_t fuse_vnop_getpages;
163 static vop_print_t fuse_vnop_print;
164 static vop_vptofh_t fuse_vnop_vptofh;
165
166 struct vop_vector fuse_fifoops = {
167 .vop_default = &fifo_specops,
168 .vop_access = fuse_vnop_access,
169 .vop_close = fuse_fifo_close,
170 .vop_fsync = fuse_vnop_fsync,
171 .vop_getattr = fuse_vnop_getattr,
172 .vop_inactive = fuse_vnop_inactive,
173 .vop_pathconf = fuse_vnop_pathconf,
174 .vop_print = fuse_vnop_print,
175 .vop_read = VOP_PANIC,
176 .vop_reclaim = fuse_vnop_reclaim,
177 .vop_setattr = fuse_vnop_setattr,
178 .vop_write = VOP_PANIC,
179 .vop_vptofh = fuse_vnop_vptofh,
180 };
181 VFS_VOP_VECTOR_REGISTER(fuse_fifoops);
182
183 struct vop_vector fuse_vnops = {
184 .vop_allocate = fuse_vnop_allocate,
185 .vop_default = &default_vnodeops,
186 .vop_access = fuse_vnop_access,
187 .vop_advlock = fuse_vnop_advlock,
188 .vop_bmap = fuse_vnop_bmap,
189 .vop_close = fuse_vnop_close,
190 .vop_copy_file_range = fuse_vnop_copy_file_range,
191 .vop_create = fuse_vnop_create,
192 .vop_deallocate = fuse_vnop_deallocate,
193 .vop_deleteextattr = fuse_vnop_deleteextattr,
194 .vop_fsync = fuse_vnop_fsync,
195 .vop_fdatasync = fuse_vnop_fdatasync,
196 .vop_getattr = fuse_vnop_getattr,
197 .vop_getextattr = fuse_vnop_getextattr,
198 .vop_inactive = fuse_vnop_inactive,
199 .vop_ioctl = fuse_vnop_ioctl,
200 .vop_link = fuse_vnop_link,
201 .vop_listextattr = fuse_vnop_listextattr,
202 .vop_lookup = fuse_vnop_lookup,
203 .vop_mkdir = fuse_vnop_mkdir,
204 .vop_mknod = fuse_vnop_mknod,
205 .vop_open = fuse_vnop_open,
206 .vop_pathconf = fuse_vnop_pathconf,
207 /*
208 * TODO: implement vop_poll after upgrading to protocol 7.21.
209 * FUSE_POLL was added in protocol 7.11, but it's kind of broken until
210 * 7.21, which adds the ability for the client to choose which poll
211 * events it wants, and for a client to deregister a file handle
212 */
213 .vop_read = fuse_vnop_read,
214 .vop_readdir = fuse_vnop_readdir,
215 .vop_readlink = fuse_vnop_readlink,
216 .vop_reclaim = fuse_vnop_reclaim,
217 .vop_remove = fuse_vnop_remove,
218 .vop_rename = fuse_vnop_rename,
219 .vop_rmdir = fuse_vnop_rmdir,
220 .vop_setattr = fuse_vnop_setattr,
221 .vop_setextattr = fuse_vnop_setextattr,
222 .vop_strategy = fuse_vnop_strategy,
223 .vop_symlink = fuse_vnop_symlink,
224 .vop_write = fuse_vnop_write,
225 .vop_getpages = fuse_vnop_getpages,
226 .vop_print = fuse_vnop_print,
227 .vop_vptofh = fuse_vnop_vptofh,
228 };
229 VFS_VOP_VECTOR_REGISTER(fuse_vnops);
230
231 /* Check permission for extattr operations, much like extattr_check_cred */
232 static int
fuse_extattr_check_cred(struct vnode * vp,int ns,struct ucred * cred,struct thread * td,accmode_t accmode)233 fuse_extattr_check_cred(struct vnode *vp, int ns, struct ucred *cred,
234 struct thread *td, accmode_t accmode)
235 {
236 struct mount *mp = vnode_mount(vp);
237 struct fuse_data *data = fuse_get_mpdata(mp);
238 int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS;
239
240 /*
241 * Kernel-invoked always succeeds.
242 */
243 if (cred == NOCRED)
244 return (0);
245
246 /*
247 * Do not allow privileged processes in jail to directly manipulate
248 * system attributes.
249 */
250 switch (ns) {
251 case EXTATTR_NAMESPACE_SYSTEM:
252 if (default_permissions) {
253 return (priv_check_cred(cred, PRIV_VFS_EXTATTR_SYSTEM));
254 }
255 return (0);
256 case EXTATTR_NAMESPACE_USER:
257 if (default_permissions) {
258 return (fuse_internal_access(vp, accmode, td, cred));
259 }
260 return (0);
261 default:
262 return (EPERM);
263 }
264 }
265
266 /* Get a filehandle for a directory */
267 static int
fuse_filehandle_get_dir(struct vnode * vp,struct fuse_filehandle ** fufhp,struct ucred * cred,pid_t pid)268 fuse_filehandle_get_dir(struct vnode *vp, struct fuse_filehandle **fufhp,
269 struct ucred *cred, pid_t pid)
270 {
271 if (fuse_filehandle_get(vp, FREAD, fufhp, cred, pid) == 0)
272 return 0;
273 return fuse_filehandle_get(vp, FEXEC, fufhp, cred, pid);
274 }
275
276 /* Send FUSE_FLUSH for this vnode */
277 static int
fuse_flush(struct vnode * vp,struct ucred * cred,pid_t pid,int fflag)278 fuse_flush(struct vnode *vp, struct ucred *cred, pid_t pid, int fflag)
279 {
280 struct fuse_flush_in *ffi;
281 struct fuse_filehandle *fufh;
282 struct fuse_dispatcher fdi;
283 struct thread *td = curthread;
284 struct mount *mp = vnode_mount(vp);
285 int err;
286
287 if (fsess_not_impl(vnode_mount(vp), FUSE_FLUSH))
288 return 0;
289
290 err = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid);
291 if (err)
292 return err;
293
294 if (fufh->fuse_open_flags & FOPEN_NOFLUSH &&
295 (!fsess_opt_writeback(vnode_mount(vp))))
296 return (0);
297
298 fdisp_init(&fdi, sizeof(*ffi));
299 fdisp_make_vp(&fdi, FUSE_FLUSH, vp, td, cred);
300 ffi = fdi.indata;
301 ffi->fh = fufh->fh_id;
302 /*
303 * If the file has a POSIX lock then we're supposed to set lock_owner.
304 * If not, then lock_owner is undefined. So we may as well always set
305 * it.
306 */
307 ffi->lock_owner = td->td_proc->p_pid;
308
309 err = fdisp_wait_answ(&fdi);
310 if (err == ENOSYS) {
311 fsess_set_notimpl(mp, FUSE_FLUSH);
312 err = 0;
313 }
314 fdisp_destroy(&fdi);
315 return err;
316 }
317
318 /* Close wrapper for fifos. */
319 static int
fuse_fifo_close(struct vop_close_args * ap)320 fuse_fifo_close(struct vop_close_args *ap)
321 {
322 return (fifo_specops.vop_close(ap));
323 }
324
325 /* Invalidate a range of cached data, whether dirty of not */
326 static int
fuse_inval_buf_range(struct vnode * vp,off_t filesize,off_t start,off_t end)327 fuse_inval_buf_range(struct vnode *vp, off_t filesize, off_t start, off_t end)
328 {
329 struct buf *bp;
330 daddr_t left_lbn, end_lbn, right_lbn;
331 off_t new_filesize;
332 int iosize, left_on, right_on, right_blksize;
333
334 iosize = fuse_iosize(vp);
335 left_lbn = start / iosize;
336 end_lbn = howmany(end, iosize);
337 left_on = start & (iosize - 1);
338 if (left_on != 0) {
339 bp = getblk(vp, left_lbn, iosize, PCATCH, 0, 0);
340 if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyend >= left_on) {
341 /*
342 * Flush the dirty buffer, because we don't have a
343 * byte-granular way to record which parts of the
344 * buffer are valid.
345 */
346 bwrite(bp);
347 if (bp->b_error)
348 return (bp->b_error);
349 } else {
350 brelse(bp);
351 }
352 }
353 right_on = end & (iosize - 1);
354 if (right_on != 0) {
355 right_lbn = end / iosize;
356 new_filesize = MAX(filesize, end);
357 right_blksize = MIN(iosize, new_filesize - iosize * right_lbn);
358 bp = getblk(vp, right_lbn, right_blksize, PCATCH, 0, 0);
359 if ((bp->b_flags & B_CACHE) != 0 && bp->b_dirtyoff < right_on) {
360 /*
361 * Flush the dirty buffer, because we don't have a
362 * byte-granular way to record which parts of the
363 * buffer are valid.
364 */
365 bwrite(bp);
366 if (bp->b_error)
367 return (bp->b_error);
368 } else {
369 brelse(bp);
370 }
371 }
372
373 v_inval_buf_range(vp, left_lbn, end_lbn, iosize);
374 return (0);
375 }
376
377
378 /* Send FUSE_LSEEK for this node */
379 static int
fuse_vnop_do_lseek(struct vnode * vp,struct thread * td,struct ucred * cred,pid_t pid,off_t * offp,int whence)380 fuse_vnop_do_lseek(struct vnode *vp, struct thread *td, struct ucred *cred,
381 pid_t pid, off_t *offp, int whence)
382 {
383 struct fuse_dispatcher fdi;
384 struct fuse_filehandle *fufh;
385 struct fuse_lseek_in *flsi;
386 struct fuse_lseek_out *flso;
387 struct mount *mp = vnode_mount(vp);
388 int err;
389
390 ASSERT_VOP_LOCKED(vp, __func__);
391
392 err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid);
393 if (err)
394 return (err);
395 fdisp_init(&fdi, sizeof(*flsi));
396 fdisp_make_vp(&fdi, FUSE_LSEEK, vp, td, cred);
397 flsi = fdi.indata;
398 flsi->fh = fufh->fh_id;
399 flsi->offset = *offp;
400 flsi->whence = whence;
401 err = fdisp_wait_answ(&fdi);
402 if (err == ENOSYS) {
403 fsess_set_notimpl(mp, FUSE_LSEEK);
404 } else if (err == ENXIO) {
405 /* Note: ENXIO means "no more hole/data regions until EOF" */
406 fsess_set_impl(mp, FUSE_LSEEK);
407 } else if (err == 0) {
408 fsess_set_impl(mp, FUSE_LSEEK);
409 flso = fdi.answ;
410 *offp = flso->offset;
411 }
412 fdisp_destroy(&fdi);
413
414 return (err);
415 }
416
417 /*
418 struct vnop_access_args {
419 struct vnode *a_vp;
420 #if VOP_ACCESS_TAKES_ACCMODE_T
421 accmode_t a_accmode;
422 #else
423 int a_mode;
424 #endif
425 struct ucred *a_cred;
426 struct thread *a_td;
427 };
428 */
429 static int
fuse_vnop_access(struct vop_access_args * ap)430 fuse_vnop_access(struct vop_access_args *ap)
431 {
432 struct vnode *vp = ap->a_vp;
433 int accmode = ap->a_accmode;
434 struct ucred *cred = ap->a_cred;
435
436 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
437
438 int err;
439
440 if (fuse_isdeadfs(vp)) {
441 if (vnode_isvroot(vp)) {
442 return 0;
443 }
444 return (EXTERROR(ENXIO, "This FUSE session is about "
445 "to be closed"));
446 }
447 if (!(data->dataflags & FSESS_INITED)) {
448 if (vnode_isvroot(vp)) {
449 if (priv_check_cred(cred, PRIV_VFS_ADMIN) ||
450 (fuse_match_cred(data->daemoncred, cred) == 0)) {
451 return 0;
452 }
453 }
454 return (EXTERROR(EBADF, "Access denied until FUSE session "
455 "is initialized"));
456 }
457 if (vnode_islnk(vp)) {
458 return 0;
459 }
460
461 err = fuse_internal_access(vp, accmode, ap->a_td, ap->a_cred);
462 return err;
463 }
464
465 /*
466 * struct vop_advlock_args {
467 * struct vop_generic_args a_gen;
468 * struct vnode *a_vp;
469 * void *a_id;
470 * int a_op;
471 * struct flock *a_fl;
472 * int a_flags;
473 * }
474 */
475 static int
fuse_vnop_advlock(struct vop_advlock_args * ap)476 fuse_vnop_advlock(struct vop_advlock_args *ap)
477 {
478 struct vnode *vp = ap->a_vp;
479 struct flock *fl = ap->a_fl;
480 struct thread *td = curthread;
481 struct ucred *cred = td->td_ucred;
482 pid_t pid = td->td_proc->p_pid;
483 struct fuse_filehandle *fufh;
484 struct fuse_dispatcher fdi;
485 struct fuse_lk_in *fli;
486 struct fuse_lk_out *flo;
487 struct vattr vattr;
488 enum fuse_opcode op;
489 off_t size, start;
490 int dataflags, err;
491 int flags = ap->a_flags;
492
493 dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
494
495 if (fuse_isdeadfs(vp)) {
496 return (EXTERROR(ENXIO, "This FUSE session is about "
497 "to be closed"));
498 }
499
500 switch(ap->a_op) {
501 case F_GETLK:
502 op = FUSE_GETLK;
503 break;
504 case F_SETLK:
505 if (flags & F_WAIT)
506 op = FUSE_SETLKW;
507 else
508 op = FUSE_SETLK;
509 break;
510 case F_UNLCK:
511 op = FUSE_SETLK;
512 break;
513 default:
514 return (EXTERROR(EINVAL, "Unsupported lock flags"));
515 }
516
517 if (!(dataflags & FSESS_POSIX_LOCKS))
518 return vop_stdadvlock(ap);
519 /* FUSE doesn't properly support flock until protocol 7.17 */
520 if (flags & F_FLOCK)
521 return vop_stdadvlock(ap);
522
523 vn_lock(vp, LK_SHARED | LK_RETRY);
524
525 switch (fl->l_whence) {
526 case SEEK_SET:
527 case SEEK_CUR:
528 /*
529 * Caller is responsible for adding any necessary offset
530 * when SEEK_CUR is used.
531 */
532 start = fl->l_start;
533 break;
534
535 case SEEK_END:
536 err = fuse_internal_getattr(vp, &vattr, cred, td);
537 if (err)
538 goto out;
539 size = vattr.va_size;
540 if (size > OFF_MAX ||
541 (fl->l_start > 0 && size > OFF_MAX - fl->l_start)) {
542 err = EXTERROR(EOVERFLOW, "Offset is too large");
543 goto out;
544 }
545 start = size + fl->l_start;
546 break;
547
548 default:
549 return (EXTERROR(EINVAL, "Unsupported offset type"));
550 }
551
552 err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid);
553 if (err)
554 goto out;
555
556 fdisp_init(&fdi, sizeof(*fli));
557
558 fdisp_make_vp(&fdi, op, vp, td, cred);
559 fli = fdi.indata;
560 fli->fh = fufh->fh_id;
561 fli->owner = td->td_proc->p_pid;
562 fli->lk.start = start;
563 if (fl->l_len != 0)
564 fli->lk.end = start + fl->l_len - 1;
565 else
566 fli->lk.end = INT64_MAX;
567 fli->lk.type = fl->l_type;
568 fli->lk.pid = td->td_proc->p_pid;
569
570 err = fdisp_wait_answ(&fdi);
571 fdisp_destroy(&fdi);
572
573 if (err == 0 && op == FUSE_GETLK) {
574 flo = fdi.answ;
575 fl->l_type = flo->lk.type;
576 fl->l_whence = SEEK_SET;
577 if (flo->lk.type != F_UNLCK) {
578 fl->l_pid = flo->lk.pid;
579 fl->l_start = flo->lk.start;
580 if (flo->lk.end == INT64_MAX)
581 fl->l_len = 0;
582 else
583 fl->l_len = flo->lk.end - flo->lk.start + 1;
584 fl->l_start = flo->lk.start;
585 }
586 }
587
588 out:
589 VOP_UNLOCK(vp);
590 return err;
591 }
592
593 static int
fuse_vnop_allocate(struct vop_allocate_args * ap)594 fuse_vnop_allocate(struct vop_allocate_args *ap)
595 {
596 struct vnode *vp = ap->a_vp;
597 off_t *len = ap->a_len;
598 off_t *offset = ap->a_offset;
599 struct ucred *cred = ap->a_cred;
600 struct fuse_filehandle *fufh;
601 struct mount *mp = vnode_mount(vp);
602 struct fuse_dispatcher fdi;
603 struct fuse_fallocate_in *ffi;
604 struct uio io;
605 pid_t pid = curthread->td_proc->p_pid;
606 struct fuse_vnode_data *fvdat = VTOFUD(vp);
607 off_t filesize;
608 int err;
609
610 if (fuse_isdeadfs(vp))
611 return (EXTERROR(ENXIO, "This FUSE session is about "
612 "to be closed"));
613
614 switch (vp->v_type) {
615 case VFIFO:
616 return (ESPIPE);
617 case VLNK:
618 case VREG:
619 break;
620 default:
621 return (ENODEV);
622 }
623
624 if (vfs_isrdonly(mp))
625 return (EROFS);
626
627 if (fsess_not_impl(mp, FUSE_FALLOCATE))
628 return (EXTERROR(EINVAL, "This server does not implement "
629 "FUSE_FALLOCATE"));
630
631 io.uio_offset = *offset;
632 io.uio_resid = *len;
633 err = vn_rlimit_fsize(vp, &io, curthread);
634 if (err)
635 return (err);
636
637 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
638 if (err)
639 return (err);
640
641 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE);
642
643 err = fuse_vnode_size(vp, &filesize, cred, curthread);
644 if (err)
645 return (err);
646 fuse_inval_buf_range(vp, filesize, *offset, *offset + *len);
647
648 fdisp_init(&fdi, sizeof(*ffi));
649 fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred);
650 ffi = fdi.indata;
651 ffi->fh = fufh->fh_id;
652 ffi->offset = *offset;
653 ffi->length = *len;
654 ffi->mode = 0;
655 err = fdisp_wait_answ(&fdi);
656
657 if (err == ENOSYS) {
658 fsess_set_notimpl(mp, FUSE_FALLOCATE);
659 err = EXTERROR(EINVAL, "This server does not implement "
660 "FUSE_ALLOCATE");
661 } else if (err == EOPNOTSUPP) {
662 /*
663 * The file system server does not support FUSE_FALLOCATE with
664 * the supplied mode for this particular file.
665 */
666 err = EXTERROR(EINVAL, "This file can't be pre-allocated");
667 } else if (!err) {
668 *offset += *len;
669 *len = 0;
670 fuse_vnode_undirty_cached_timestamps(vp, false);
671 fuse_internal_clear_suid_on_write(vp, cred, curthread);
672 if (*offset > fvdat->cached_attrs.va_size) {
673 fuse_vnode_setsize(vp, *offset, false);
674 getnanouptime(&fvdat->last_local_modify);
675 }
676 }
677
678 fdisp_destroy(&fdi);
679 return (err);
680 }
681
682 /* {
683 struct vnode *a_vp;
684 daddr_t a_bn;
685 struct bufobj **a_bop;
686 daddr_t *a_bnp;
687 int *a_runp;
688 int *a_runb;
689 } */
690 static int
fuse_vnop_bmap(struct vop_bmap_args * ap)691 fuse_vnop_bmap(struct vop_bmap_args *ap)
692 {
693 struct vnode *vp = ap->a_vp;
694 struct bufobj **bo = ap->a_bop;
695 struct thread *td = curthread;
696 struct mount *mp;
697 struct fuse_dispatcher fdi;
698 struct fuse_bmap_in *fbi;
699 struct fuse_bmap_out *fbo;
700 struct fuse_data *data;
701 struct fuse_vnode_data *fvdat = VTOFUD(vp);
702 uint64_t biosize;
703 off_t fsize;
704 daddr_t lbn = ap->a_bn;
705 daddr_t *pbn = ap->a_bnp;
706 int *runp = ap->a_runp;
707 int *runb = ap->a_runb;
708 int error = 0;
709 int maxrun;
710
711 if (fuse_isdeadfs(vp)) {
712 return (EXTERROR(ENXIO, "This FUSE session is about "
713 "to be closed"));
714 }
715
716 mp = vnode_mount(vp);
717 data = fuse_get_mpdata(mp);
718 biosize = fuse_iosize(vp);
719 maxrun = MIN(vp->v_mount->mnt_iosize_max / biosize - 1,
720 data->max_readahead_blocks);
721
722 if (bo != NULL)
723 *bo = &vp->v_bufobj;
724
725 /*
726 * The FUSE_BMAP operation does not include the runp and runb
727 * variables, so we must guess. Report nonzero contiguous runs so
728 * cluster_read will combine adjacent reads. It's worthwhile to reduce
729 * upcalls even if we don't know the true physical layout of the file.
730 *
731 * FUSE file systems may opt out of read clustering in two ways:
732 * * mounting with -onoclusterr
733 * * Setting max_readahead <= maxbcachebuf during FUSE_INIT
734 */
735 if (runb != NULL)
736 *runb = MIN(lbn, maxrun);
737 if (runp != NULL && maxrun == 0)
738 *runp = 0;
739 else if (runp != NULL) {
740 /*
741 * If the file's size is cached, use that value to calculate
742 * runp, even if the cache is expired. runp is only advisory,
743 * and the risk of getting it wrong is not worth the cost of
744 * another upcall.
745 */
746 if (fvdat->cached_attrs.va_size != VNOVAL)
747 fsize = fvdat->cached_attrs.va_size;
748 else
749 error = fuse_vnode_size(vp, &fsize, td->td_ucred, td);
750 if (error == 0)
751 *runp = MIN(MAX(0, fsize / (off_t)biosize - lbn - 1),
752 maxrun);
753 else
754 *runp = 0;
755 }
756
757 if (fsess_maybe_impl(mp, FUSE_BMAP)) {
758 fdisp_init(&fdi, sizeof(*fbi));
759 fdisp_make_vp(&fdi, FUSE_BMAP, vp, td, td->td_ucred);
760 fbi = fdi.indata;
761 fbi->block = lbn;
762 fbi->blocksize = biosize;
763 error = fdisp_wait_answ(&fdi);
764 if (error == ENOSYS) {
765 fdisp_destroy(&fdi);
766 fsess_set_notimpl(mp, FUSE_BMAP);
767 error = 0;
768 } else {
769 fbo = fdi.answ;
770 if (error == 0 && pbn != NULL)
771 *pbn = fbo->block;
772 fdisp_destroy(&fdi);
773 return error;
774 }
775 }
776
777 /* If the daemon doesn't support BMAP, make up a sensible default */
778 if (pbn != NULL)
779 *pbn = lbn * btodb(biosize);
780 return (error);
781 }
782
783 /*
784 struct vop_close_args {
785 struct vnode *a_vp;
786 int a_fflag;
787 struct ucred *a_cred;
788 struct thread *a_td;
789 };
790 */
791 static int
fuse_vnop_close(struct vop_close_args * ap)792 fuse_vnop_close(struct vop_close_args *ap)
793 {
794 struct vnode *vp = ap->a_vp;
795 struct mount *mp = vnode_mount(vp);
796 struct ucred *cred = ap->a_cred;
797 int fflag = ap->a_fflag;
798 struct thread *td;
799 struct fuse_vnode_data *fvdat = VTOFUD(vp);
800 pid_t pid;
801 int err = 0;
802
803 /* NB: a_td will be NULL from some async kernel contexts */
804 td = ap->a_td ? ap->a_td : curthread;
805 pid = td->td_proc->p_pid;
806
807 if (fuse_isdeadfs(vp))
808 return 0;
809 if (vnode_isdir(vp))
810 return 0;
811 if (fflag & IO_NDELAY)
812 return 0;
813
814 if (cred == NULL)
815 cred = td->td_ucred;
816
817 err = fuse_flush(vp, cred, pid, fflag);
818 if (err == 0 && (fvdat->flag & FN_ATIMECHANGE) && !vfs_isrdonly(mp)) {
819 struct vattr vap;
820 struct fuse_data *data;
821 int dataflags;
822 int access_e = 0;
823
824 data = fuse_get_mpdata(mp);
825 dataflags = data->dataflags;
826 if (dataflags & FSESS_DEFAULT_PERMISSIONS) {
827 struct vattr va;
828
829 fuse_internal_getattr(vp, &va, cred, td);
830 access_e = vaccess(vp->v_type, va.va_mode, va.va_uid,
831 va.va_gid, VWRITE, cred);
832 }
833 if (access_e == 0) {
834 VATTR_NULL(&vap);
835 vap.va_atime = fvdat->cached_attrs.va_atime;
836 /*
837 * Ignore errors setting when setting atime. That
838 * should not cause close(2) to fail.
839 */
840 fuse_internal_setattr(vp, &vap, td, NULL);
841 }
842 }
843 /* TODO: close the file handle, if we're sure it's no longer used */
844 if ((fvdat->flag & FN_SIZECHANGE) != 0) {
845 fuse_vnode_savesize(vp, cred, pid);
846 }
847 return err;
848 }
849
850 /*
851 struct vop_copy_file_range_args {
852 struct vop_generic_args a_gen;
853 struct vnode *a_invp;
854 off_t *a_inoffp;
855 struct vnode *a_outvp;
856 off_t *a_outoffp;
857 size_t *a_lenp;
858 unsigned int a_flags;
859 struct ucred *a_incred;
860 struct ucred *a_outcred;
861 struct thread *a_fsizetd;
862 }
863 */
864 static int
fuse_vnop_copy_file_range(struct vop_copy_file_range_args * ap)865 fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap)
866 {
867 struct vnode *invp = ap->a_invp;
868 struct vnode *outvp = ap->a_outvp;
869 struct mount *mp = vnode_mount(invp);
870 struct fuse_vnode_data *outfvdat = VTOFUD(outvp);
871 struct fuse_dispatcher fdi;
872 struct fuse_filehandle *infufh, *outfufh;
873 struct fuse_copy_file_range_in *fcfri;
874 struct ucred *incred = ap->a_incred;
875 struct ucred *outcred = ap->a_outcred;
876 struct fuse_write_out *fwo;
877 struct thread *td;
878 struct uio io;
879 off_t outfilesize;
880 ssize_t r = 0;
881 pid_t pid;
882 int err;
883
884 if ((ap->a_flags & COPY_FILE_RANGE_CLONE) != 0)
885 return (EXTERROR(ENOSYS, "Cannot clone"));
886
887 if (mp == NULL || mp != vnode_mount(outvp))
888 return (EXTERROR(ENOSYS, "Mount points do not match"));
889
890 if (incred->cr_uid != outcred->cr_uid)
891 return (EXTERROR(ENOSYS, "FUSE_COPY_FILE_RANGE does not "
892 "support different credentials for infd and outfd"));
893
894 if (incred->cr_gid != outcred->cr_gid)
895 return (EXTERROR(ENOSYS, "FUSE_COPY_FILE_RANGE does not "
896 "support different credentials for infd and outfd"));
897
898 /* Caller busied mp, mnt_data can be safely accessed. */
899 if (fsess_not_impl(mp, FUSE_COPY_FILE_RANGE))
900 return (EXTERROR(ENOSYS, "This daemon does not "
901 "implement COPY_FILE_RANGE"));
902
903 if (ap->a_fsizetd == NULL)
904 td = curthread;
905 else
906 td = ap->a_fsizetd;
907 pid = td->td_proc->p_pid;
908
909 vn_lock_pair(invp, false, LK_SHARED, outvp, false, LK_EXCLUSIVE);
910 if (invp->v_data == NULL || outvp->v_data == NULL) {
911 err = EXTERROR(EBADF, "vnode got reclaimed");
912 goto unlock;
913 }
914
915 err = fuse_filehandle_getrw(invp, FREAD, &infufh, incred, pid);
916 if (err)
917 goto unlock;
918
919 err = fuse_filehandle_getrw(outvp, FWRITE, &outfufh, outcred, pid);
920 if (err)
921 goto unlock;
922
923 io.uio_resid = *ap->a_lenp;
924 if (ap->a_fsizetd) {
925 io.uio_offset = *ap->a_outoffp;
926 err = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd);
927 if (err != 0)
928 goto unlock;
929 }
930
931 err = fuse_vnode_size(outvp, &outfilesize, outcred, curthread);
932 if (err)
933 goto unlock;
934
935 vnode_pager_clean_sync(invp);
936 err = fuse_inval_buf_range(outvp, outfilesize, *ap->a_outoffp,
937 *ap->a_outoffp + io.uio_resid);
938 if (err)
939 goto unlock;
940
941 fdisp_init(&fdi, sizeof(*fcfri));
942 fdisp_make_vp(&fdi, FUSE_COPY_FILE_RANGE, invp, td, incred);
943 fcfri = fdi.indata;
944 fcfri->fh_in = infufh->fh_id;
945 fcfri->off_in = *ap->a_inoffp;
946 fcfri->nodeid_out = VTOI(outvp);
947 fcfri->fh_out = outfufh->fh_id;
948 fcfri->off_out = *ap->a_outoffp;
949 fcfri->len = io.uio_resid;
950 fcfri->flags = 0;
951
952 err = fdisp_wait_answ(&fdi);
953 if (err == 0) {
954 fwo = fdi.answ;
955 *ap->a_lenp = fwo->size;
956 *ap->a_inoffp += fwo->size;
957 *ap->a_outoffp += fwo->size;
958 fuse_internal_clear_suid_on_write(outvp, outcred, td);
959 if (*ap->a_outoffp > outfvdat->cached_attrs.va_size) {
960 fuse_vnode_setsize(outvp, *ap->a_outoffp, false);
961 getnanouptime(&outfvdat->last_local_modify);
962 }
963 fuse_vnode_update(invp, FN_ATIMECHANGE);
964 fuse_vnode_update(outvp, FN_MTIMECHANGE | FN_CTIMECHANGE);
965 }
966 fdisp_destroy(&fdi);
967
968 unlock:
969 if (invp != outvp)
970 VOP_UNLOCK(invp);
971 VOP_UNLOCK(outvp);
972
973 if (err == ENOSYS)
974 fsess_set_notimpl(mp, FUSE_COPY_FILE_RANGE);
975
976 /*
977 * No need to call vn_rlimit_fsizex_res before return, since the uio is
978 * local.
979 */
980 return (err);
981 }
982
983 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)984 fdisp_make_mknod_for_fallback(
985 struct fuse_dispatcher *fdip,
986 struct componentname *cnp,
987 struct vnode *dvp,
988 uint64_t parentnid,
989 struct thread *td,
990 struct ucred *cred,
991 mode_t mode,
992 enum fuse_opcode *op)
993 {
994 struct fuse_mknod_in *fmni;
995
996 fdisp_init(fdip, sizeof(*fmni) + cnp->cn_namelen + 1);
997 *op = FUSE_MKNOD;
998 fdisp_make(fdip, *op, vnode_mount(dvp), parentnid, td, cred);
999 fmni = fdip->indata;
1000 fmni->mode = mode;
1001 fmni->rdev = 0;
1002 memcpy((char *)fdip->indata + sizeof(*fmni), cnp->cn_nameptr,
1003 cnp->cn_namelen);
1004 ((char *)fdip->indata)[sizeof(*fmni) + cnp->cn_namelen] = '\0';
1005 }
1006 /*
1007 struct vnop_create_args {
1008 struct vnode *a_dvp;
1009 struct vnode **a_vpp;
1010 struct componentname *a_cnp;
1011 struct vattr *a_vap;
1012 };
1013 */
1014 static int
fuse_vnop_create(struct vop_create_args * ap)1015 fuse_vnop_create(struct vop_create_args *ap)
1016 {
1017 struct vnode *dvp = ap->a_dvp;
1018 struct vnode **vpp = ap->a_vpp;
1019 struct componentname *cnp = ap->a_cnp;
1020 struct vattr *vap = ap->a_vap;
1021 struct thread *td = curthread;
1022 struct ucred *cred = cnp->cn_cred;
1023
1024 struct fuse_data *data;
1025 struct fuse_create_in *fci;
1026 struct fuse_entry_out *feo;
1027 struct fuse_open_out *foo;
1028 struct fuse_dispatcher fdi, fdi2;
1029 struct fuse_dispatcher *fdip = &fdi;
1030 struct fuse_dispatcher *fdip2 = NULL;
1031
1032 int err;
1033
1034 struct mount *mp = vnode_mount(dvp);
1035 data = fuse_get_mpdata(mp);
1036 uint64_t parentnid = VTOFUD(dvp)->nid;
1037 mode_t mode = MAKEIMODE(vap->va_type, vap->va_mode);
1038 enum fuse_opcode op;
1039 int flags;
1040
1041 if (fuse_isdeadfs(dvp))
1042 return (EXTERROR(ENXIO, "This FUSE session is about "
1043 "to be closed"));
1044
1045 /* FUSE expects sockets to be created with FUSE_MKNOD */
1046 if (vap->va_type == VSOCK)
1047 return fuse_internal_mknod(dvp, vpp, cnp, vap);
1048
1049 /*
1050 * VOP_CREATE doesn't tell us the open(2) flags, so we guess. Only a
1051 * writable mode makes sense, and we might as well include readability
1052 * too.
1053 */
1054 flags = O_RDWR;
1055
1056 bzero(&fdi, sizeof(fdi));
1057
1058 if (vap->va_type != VREG)
1059 return (EXTERROR(EINVAL, "Only regular files can be created"));
1060
1061 if (fsess_not_impl(mp, FUSE_CREATE) || vap->va_type == VSOCK) {
1062 /* Fallback to FUSE_MKNOD/FUSE_OPEN */
1063 fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td,
1064 cred, mode, &op);
1065 } else {
1066 /* Use FUSE_CREATE */
1067 size_t insize;
1068
1069 op = FUSE_CREATE;
1070 fdisp_init(fdip, sizeof(*fci) + cnp->cn_namelen + 1);
1071 fdisp_make(fdip, op, vnode_mount(dvp), parentnid, td, cred);
1072 fci = fdip->indata;
1073 fci->mode = mode;
1074 fci->flags = O_CREAT | flags;
1075 if (fuse_libabi_geq(data, 7, 12)) {
1076 insize = sizeof(*fci);
1077 fci->umask = td->td_proc->p_pd->pd_cmask;
1078 } else {
1079 insize = sizeof(struct fuse_open_in);
1080 }
1081
1082 memcpy((char *)fdip->indata + insize, cnp->cn_nameptr,
1083 cnp->cn_namelen);
1084 ((char *)fdip->indata)[insize + cnp->cn_namelen] = '\0';
1085 }
1086
1087 err = fdisp_wait_answ(fdip);
1088
1089 if (err) {
1090 if (err == ENOSYS && op == FUSE_CREATE) {
1091 fsess_set_notimpl(mp, FUSE_CREATE);
1092 fdisp_destroy(fdip);
1093 fdisp_make_mknod_for_fallback(fdip, cnp, dvp,
1094 parentnid, td, cred, mode, &op);
1095 err = fdisp_wait_answ(fdip);
1096 }
1097 if (err)
1098 goto out;
1099 }
1100
1101 feo = fdip->answ;
1102
1103 if ((err = fuse_internal_checkentry(feo, vap->va_type))) {
1104 goto out;
1105 }
1106
1107 if (op == FUSE_CREATE) {
1108 if (fuse_libabi_geq(data, 7, 9))
1109 foo = (struct fuse_open_out*)(feo + 1);
1110 else
1111 foo = (struct fuse_open_out*)((char*)feo +
1112 FUSE_COMPAT_ENTRY_OUT_SIZE);
1113 } else {
1114 /* Issue a separate FUSE_OPEN */
1115 struct fuse_open_in *foi;
1116
1117 fdip2 = &fdi2;
1118 fdisp_init(fdip2, sizeof(*foi));
1119 fdisp_make(fdip2, FUSE_OPEN, vnode_mount(dvp), feo->nodeid, td,
1120 cred);
1121 foi = fdip2->indata;
1122 foi->flags = flags;
1123 err = fdisp_wait_answ(fdip2);
1124 if (err)
1125 goto out;
1126 foo = fdip2->answ;
1127 }
1128 err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vap->va_type);
1129 if (err) {
1130 struct fuse_release_in *fri;
1131 uint64_t nodeid = feo->nodeid;
1132 uint64_t fh_id = foo->fh;
1133
1134 fdisp_destroy(fdip);
1135 fdisp_init(fdip, sizeof(*fri));
1136 fdisp_make(fdip, FUSE_RELEASE, mp, nodeid, td, cred);
1137 fri = fdip->indata;
1138 fri->fh = fh_id;
1139 fri->flags = flags;
1140 fuse_insert_callback(fdip->tick, fuse_internal_forget_callback);
1141 fuse_insert_message(fdip->tick, false);
1142 goto out;
1143 }
1144 ASSERT_VOP_ELOCKED(*vpp, "fuse_vnop_create");
1145 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
1146 feo->attr_valid_nsec, NULL, true);
1147
1148 fuse_filehandle_init(*vpp, FUFH_RDWR, NULL, td, cred, foo);
1149 fuse_vnode_open(*vpp, foo->open_flags, td);
1150 /*
1151 * Purge the parent's attribute cache because the daemon should've
1152 * updated its mtime and ctime
1153 */
1154 fuse_vnode_clear_attr_cache(dvp);
1155 cache_purge_negative(dvp);
1156
1157 out:
1158 if (fdip2)
1159 fdisp_destroy(fdip2);
1160 fdisp_destroy(fdip);
1161 return err;
1162 }
1163
1164 /*
1165 struct vnop_fdatasync_args {
1166 struct vop_generic_args a_gen;
1167 struct vnode * a_vp;
1168 struct thread * a_td;
1169 };
1170 */
1171 static int
fuse_vnop_fdatasync(struct vop_fdatasync_args * ap)1172 fuse_vnop_fdatasync(struct vop_fdatasync_args *ap)
1173 {
1174 struct vnode *vp = ap->a_vp;
1175 struct thread *td = ap->a_td;
1176 int waitfor = MNT_WAIT;
1177
1178 int err = 0;
1179
1180 if (fuse_isdeadfs(vp)) {
1181 return 0;
1182 }
1183 if ((err = vop_stdfdatasync_buf(ap)))
1184 return err;
1185
1186 return fuse_internal_fsync(vp, td, waitfor, true);
1187 }
1188
1189 /*
1190 struct vnop_fsync_args {
1191 struct vop_generic_args a_gen;
1192 struct vnode * a_vp;
1193 int a_waitfor;
1194 struct thread * a_td;
1195 };
1196 */
1197 static int
fuse_vnop_fsync(struct vop_fsync_args * ap)1198 fuse_vnop_fsync(struct vop_fsync_args *ap)
1199 {
1200 struct vnode *vp = ap->a_vp;
1201 struct thread *td = ap->a_td;
1202 int waitfor = ap->a_waitfor;
1203 int err = 0;
1204
1205 if (fuse_isdeadfs(vp)) {
1206 return 0;
1207 }
1208 if ((err = vop_stdfsync(ap)))
1209 return err;
1210
1211 return fuse_internal_fsync(vp, td, waitfor, false);
1212 }
1213
1214 /*
1215 struct vnop_getattr_args {
1216 struct vnode *a_vp;
1217 struct vattr *a_vap;
1218 struct ucred *a_cred;
1219 struct thread *a_td;
1220 };
1221 */
1222 static int
fuse_vnop_getattr(struct vop_getattr_args * ap)1223 fuse_vnop_getattr(struct vop_getattr_args *ap)
1224 {
1225 struct vnode *vp = ap->a_vp;
1226 struct vattr *vap = ap->a_vap;
1227 struct ucred *cred = ap->a_cred;
1228 struct thread *td = curthread;
1229 int err = 0;
1230
1231 err = fuse_internal_getattr(vp, vap, cred, td);
1232 if (err == ENOTCONN && vnode_isvroot(vp)) {
1233 /*
1234 * We want to seem a legitimate fs even if the daemon is dead,
1235 * so that, eg., we can still do path based unmounting after
1236 * the daemon dies.
1237 */
1238 err = 0;
1239 bzero(vap, sizeof(*vap));
1240 vap->va_type = vnode_vtype(vp);
1241 }
1242 return err;
1243 }
1244
1245 /*
1246 struct vnop_inactive_args {
1247 struct vnode *a_vp;
1248 };
1249 */
1250 static int
fuse_vnop_inactive(struct vop_inactive_args * ap)1251 fuse_vnop_inactive(struct vop_inactive_args *ap)
1252 {
1253 struct vnode *vp = ap->a_vp;
1254 struct thread *td = curthread;
1255
1256 struct fuse_vnode_data *fvdat = VTOFUD(vp);
1257 struct fuse_filehandle *fufh, *fufh_tmp;
1258
1259 int need_flush = 1;
1260
1261 LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) {
1262 if (need_flush && vp->v_type == VREG) {
1263 if ((VTOFUD(vp)->flag & FN_SIZECHANGE) != 0) {
1264 fuse_vnode_savesize(vp, NULL, 0);
1265 }
1266 if ((fvdat->flag & FN_REVOKED) != 0)
1267 fuse_io_invalbuf(vp, td);
1268 else
1269 fuse_io_flushbuf(vp, MNT_WAIT, td);
1270 need_flush = 0;
1271 }
1272 fuse_filehandle_close(vp, fufh, td, NULL);
1273 }
1274
1275 if ((fvdat->flag & FN_REVOKED) != 0)
1276 vrecycle(vp);
1277
1278 return 0;
1279 }
1280
1281 /*
1282 struct vnop_ioctl_args {
1283 struct vnode *a_vp;
1284 u_long a_command;
1285 caddr_t a_data;
1286 int a_fflag;
1287 struct ucred *a_cred;
1288 struct thread *a_td;
1289 };
1290 */
1291 static int
fuse_vnop_ioctl(struct vop_ioctl_args * ap)1292 fuse_vnop_ioctl(struct vop_ioctl_args *ap)
1293 {
1294 struct vnode *vp = ap->a_vp;
1295 struct mount *mp = vnode_mount(vp);
1296 struct ucred *cred = ap->a_cred;
1297 off_t *offp;
1298 pid_t pid = ap->a_td->td_proc->p_pid;
1299 int err;
1300
1301 switch (ap->a_command) {
1302 case FIOSEEKDATA:
1303 case FIOSEEKHOLE:
1304 /* Call FUSE_LSEEK, if we can, or fall back to vop_stdioctl */
1305 if (fsess_maybe_impl(mp, FUSE_LSEEK)) {
1306 int whence;
1307
1308 offp = ap->a_data;
1309 if (ap->a_command == FIOSEEKDATA)
1310 whence = SEEK_DATA;
1311 else
1312 whence = SEEK_HOLE;
1313
1314 vn_lock(vp, LK_SHARED | LK_RETRY);
1315 err = fuse_vnop_do_lseek(vp, ap->a_td, cred, pid, offp,
1316 whence);
1317 VOP_UNLOCK(vp);
1318 }
1319 if (fsess_not_impl(mp, FUSE_LSEEK))
1320 err = vop_stdioctl(ap);
1321 break;
1322 default:
1323 /* TODO: implement FUSE_IOCTL */
1324 err = ENOTTY;
1325 break;
1326 }
1327 return (err);
1328 }
1329
1330
1331 /*
1332 struct vnop_link_args {
1333 struct vnode *a_tdvp;
1334 struct vnode *a_vp;
1335 struct componentname *a_cnp;
1336 };
1337 */
1338 static int
fuse_vnop_link(struct vop_link_args * ap)1339 fuse_vnop_link(struct vop_link_args *ap)
1340 {
1341 struct vnode *vp = ap->a_vp;
1342 struct vnode *tdvp = ap->a_tdvp;
1343 struct componentname *cnp = ap->a_cnp;
1344
1345 struct vattr *vap = VTOVA(vp);
1346
1347 struct fuse_dispatcher fdi;
1348 struct fuse_entry_out *feo;
1349 struct fuse_link_in fli;
1350
1351 int err;
1352
1353 if (fuse_isdeadfs(vp)) {
1354 return (EXTERROR(ENXIO, "This FUSE session is about "
1355 "to be closed"));
1356 }
1357 if (vnode_mount(tdvp) != vnode_mount(vp)) {
1358 return (EXDEV);
1359 }
1360
1361 /*
1362 * This is a seatbelt check to protect naive userspace filesystems from
1363 * themselves and the limitations of the FUSE IPC protocol. If a
1364 * filesystem does not allow attribute caching, assume it is capable of
1365 * validating that nlink does not overflow.
1366 */
1367 if (vap != NULL && vap->va_nlink >= FUSE_LINK_MAX)
1368 return (EMLINK);
1369 fli.oldnodeid = VTOI(vp);
1370
1371 fdisp_init(&fdi, 0);
1372 fuse_internal_newentry_makerequest(vnode_mount(tdvp), VTOI(tdvp), cnp,
1373 FUSE_LINK, &fli, sizeof(fli), &fdi);
1374 if ((err = fdisp_wait_answ(&fdi))) {
1375 goto out;
1376 }
1377 feo = fdi.answ;
1378
1379 if (fli.oldnodeid != feo->nodeid) {
1380 static const char exterr[] = "Server assigned wrong inode "
1381 "for a hard link.";
1382 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
1383 fuse_warn(data, FSESS_WARN_ILLEGAL_INODE, exterr);
1384 fuse_vnode_clear_attr_cache(vp);
1385 fuse_vnode_clear_attr_cache(tdvp);
1386 err = EXTERROR(EIO, exterr);
1387 goto out;
1388 }
1389
1390 err = fuse_internal_checkentry(feo, vnode_vtype(vp));
1391 if (!err) {
1392 /*
1393 * Purge the parent's attribute cache because the daemon
1394 * should've updated its mtime and ctime
1395 */
1396 fuse_vnode_clear_attr_cache(tdvp);
1397 fuse_internal_cache_attrs(vp, &feo->attr, feo->attr_valid,
1398 feo->attr_valid_nsec, NULL, true);
1399 }
1400 out:
1401 fdisp_destroy(&fdi);
1402 return err;
1403 }
1404
1405 struct fuse_lookup_alloc_arg {
1406 struct fuse_entry_out *feo;
1407 struct componentname *cnp;
1408 uint64_t nid;
1409 __enum_uint8(vtype) vtyp;
1410 };
1411
1412 /* Callback for vn_get_ino */
1413 static int
fuse_lookup_alloc(struct mount * mp,void * arg,int lkflags,struct vnode ** vpp)1414 fuse_lookup_alloc(struct mount *mp, void *arg, int lkflags, struct vnode **vpp)
1415 {
1416 struct fuse_lookup_alloc_arg *flaa = arg;
1417
1418 return fuse_vnode_get(mp, flaa->feo, flaa->nid, NULL, vpp, flaa->cnp,
1419 flaa->vtyp);
1420 }
1421
1422 SDT_PROBE_DEFINE3(fusefs, , vnops, cache_lookup,
1423 "int", "struct timespec*", "struct timespec*");
1424 /*
1425 struct vnop_lookup_args {
1426 struct vnodeop_desc *a_desc;
1427 struct vnode *a_dvp;
1428 struct vnode **a_vpp;
1429 struct componentname *a_cnp;
1430 };
1431 */
1432 int
fuse_vnop_lookup(struct vop_lookup_args * ap)1433 fuse_vnop_lookup(struct vop_lookup_args *ap)
1434 {
1435 struct vnode *dvp = ap->a_dvp;
1436 struct vnode **vpp = ap->a_vpp;
1437 struct componentname *cnp = ap->a_cnp;
1438 struct thread *td = curthread;
1439 struct ucred *cred = cnp->cn_cred;
1440 struct timespec now;
1441
1442 int nameiop = cnp->cn_nameiop;
1443 bool isdotdot = cnp->cn_flags & ISDOTDOT;
1444 bool islastcn = cnp->cn_flags & ISLASTCN;
1445 struct mount *mp = vnode_mount(dvp);
1446 struct fuse_data *data = fuse_get_mpdata(mp);
1447 int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS;
1448 bool is_dot;
1449
1450 int err = 0;
1451 int lookup_err = 0;
1452 struct vnode *vp = NULL;
1453
1454 struct fuse_dispatcher fdi;
1455 bool did_lookup = false;
1456 struct fuse_entry_out *feo = NULL;
1457 __enum_uint8(vtype) vtyp; /* vnode type of target */
1458
1459 uint64_t nid;
1460
1461 if (fuse_isdeadfs(dvp)) {
1462 *vpp = NULL;
1463 return (EXTERROR(ENXIO, "This FUSE session is about "
1464 "to be closed"));
1465 }
1466 if (!vnode_isdir(dvp))
1467 return ENOTDIR;
1468
1469 if (islastcn && vfs_isrdonly(mp) && (nameiop != LOOKUP))
1470 return EROFS;
1471
1472 if ((cnp->cn_flags & NOEXECCHECK) != 0)
1473 cnp->cn_flags &= ~NOEXECCHECK;
1474 else if ((err = fuse_internal_access(dvp, VEXEC, td, cred)))
1475 return err;
1476
1477 is_dot = cnp->cn_namelen == 1 && *(cnp->cn_nameptr) == '.';
1478 if (isdotdot && !(data->dataflags & FSESS_EXPORT_SUPPORT)) {
1479 if (!(VTOFUD(dvp)->flag & FN_PARENT_NID)) {
1480 /*
1481 * Since the file system doesn't support ".." lookups,
1482 * we have no way to find this entry.
1483 */
1484 return (EXTERROR(ESTALE, "This server does not support "
1485 "'..' lookups"));
1486 }
1487 nid = VTOFUD(dvp)->parent_nid;
1488 if (nid == 0)
1489 return ENOENT;
1490 /* .. is obviously a directory */
1491 vtyp = VDIR;
1492 } else if (is_dot) {
1493 nid = VTOI(dvp);
1494 /* . is obviously a directory */
1495 vtyp = VDIR;
1496 } else {
1497 struct timespec timeout;
1498 int ncpticks; /* here to accommodate for API contract */
1499
1500 err = cache_lookup(dvp, vpp, cnp, &timeout, &ncpticks);
1501 getnanouptime(&now);
1502 SDT_PROBE3(fusefs, , vnops, cache_lookup, err, &timeout, &now);
1503 switch (err) {
1504 case -1: /* positive match */
1505 if (timespeccmp(&timeout, &now, >)) {
1506 counter_u64_add(fuse_lookup_cache_hits, 1);
1507 } else {
1508 /* Cache timeout */
1509 counter_u64_add(fuse_lookup_cache_misses, 1);
1510 bintime_clear(
1511 &VTOFUD(*vpp)->entry_cache_timeout);
1512 cache_purge(*vpp);
1513 if (dvp != *vpp)
1514 vput(*vpp);
1515 else
1516 vrele(*vpp);
1517 *vpp = NULL;
1518 break;
1519 }
1520 return 0;
1521
1522 case 0: /* no match in cache */
1523 counter_u64_add(fuse_lookup_cache_misses, 1);
1524 break;
1525
1526 case ENOENT: /* negative match */
1527 if (timespeccmp(&timeout, &now, <=)) {
1528 /* Cache timeout */
1529 cache_purge_negative(dvp);
1530 break;
1531 }
1532 /* fall through */
1533 default:
1534 return err;
1535 }
1536
1537 fdisp_init(&fdi, cnp->cn_namelen + 1);
1538 fdisp_make(&fdi, FUSE_LOOKUP, mp, VTOI(dvp), td, cred);
1539
1540 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
1541 ((char *)fdi.indata)[cnp->cn_namelen] = '\0';
1542 lookup_err = fdisp_wait_answ(&fdi);
1543 did_lookup = true;
1544
1545 if (!lookup_err) {
1546 /* lookup call succeeded */
1547 feo = (struct fuse_entry_out *)fdi.answ;
1548 nid = feo->nodeid;
1549 if (nid == 0) {
1550 /* zero nodeid means ENOENT and cache it */
1551 struct timespec timeout;
1552
1553 fdi.answ_stat = ENOENT;
1554 lookup_err = ENOENT;
1555 if (cnp->cn_flags & MAKEENTRY) {
1556 fuse_validity_2_timespec(feo, &timeout);
1557 /* Use the same entry_time for .. as for
1558 * the file itself. That doesn't honor
1559 * exactly what the fuse server tells
1560 * us, but to do otherwise would require
1561 * another cache lookup at this point.
1562 */
1563 struct timespec *dtsp = NULL;
1564 cache_enter_time(dvp, *vpp, cnp,
1565 &timeout, dtsp);
1566 }
1567 }
1568 vtyp = IFTOVT(feo->attr.mode);
1569 }
1570 if (lookup_err && (!fdi.answ_stat || lookup_err != ENOENT)) {
1571 fdisp_destroy(&fdi);
1572 return lookup_err;
1573 }
1574 }
1575 /* lookup_err, if non-zero, must be ENOENT at this point */
1576
1577 if (lookup_err) {
1578 /* Entry not found */
1579 if ((nameiop == CREATE || nameiop == RENAME) && islastcn) {
1580 if (default_permissions)
1581 err = fuse_internal_access(dvp, VWRITE, td,
1582 cred);
1583 else
1584 err = 0;
1585 if (!err) {
1586 err = EJUSTRETURN;
1587 }
1588 } else {
1589 err = ENOENT;
1590 }
1591 } else {
1592 /* Entry was found */
1593 if (isdotdot) {
1594 struct fuse_lookup_alloc_arg flaa;
1595
1596 flaa.nid = nid;
1597 flaa.feo = feo;
1598 flaa.cnp = cnp;
1599 flaa.vtyp = vtyp;
1600 err = vn_vget_ino_gen(dvp, fuse_lookup_alloc, &flaa, 0,
1601 &vp);
1602 *vpp = vp;
1603 } else if (nid == VTOI(dvp)) {
1604 if (is_dot) {
1605 vref(dvp);
1606 *vpp = dvp;
1607 } else {
1608 static const char exterr[] = "Server assigned "
1609 "same inode to both parent and child.";
1610 fuse_warn(fuse_get_mpdata(mp),
1611 FSESS_WARN_ILLEGAL_INODE, exterr);
1612 err = EXTERROR(EIO, exterr);
1613 }
1614
1615 } else {
1616 struct fuse_vnode_data *fvdat;
1617
1618 err = fuse_vnode_get(vnode_mount(dvp), feo, nid, dvp,
1619 &vp, cnp, vtyp);
1620 if (err)
1621 goto out;
1622 *vpp = vp;
1623 fvdat = VTOFUD(vp);
1624
1625 MPASS(feo != NULL);
1626 if (timespeccmp(&now, &fvdat->last_local_modify, >)) {
1627 /*
1628 * Attributes from the server are definitely
1629 * newer than the last attributes we sent to
1630 * the server, so cache them.
1631 */
1632 fuse_internal_cache_attrs(*vpp, &feo->attr,
1633 feo->attr_valid, feo->attr_valid_nsec,
1634 NULL, true);
1635 }
1636 fuse_validity_2_bintime(feo->entry_valid,
1637 feo->entry_valid_nsec,
1638 &fvdat->entry_cache_timeout);
1639
1640 if ((nameiop == DELETE || nameiop == RENAME) &&
1641 islastcn && default_permissions)
1642 {
1643 struct vattr dvattr;
1644
1645 err = fuse_internal_access(dvp, VWRITE, td,
1646 cred);
1647 if (err != 0)
1648 goto out;
1649 /*
1650 * if the parent's sticky bit is set, check
1651 * whether we're allowed to remove the file.
1652 * Need to figure out the vnode locking to make
1653 * this work.
1654 */
1655 fuse_internal_getattr(dvp, &dvattr, cred, td);
1656 if ((dvattr.va_mode & S_ISTXT) &&
1657 fuse_internal_access(dvp, VADMIN, td,
1658 cred) &&
1659 fuse_internal_access(*vpp, VADMIN, td,
1660 cred)) {
1661 err = EPERM;
1662 goto out;
1663 }
1664 }
1665 }
1666 }
1667 out:
1668 if (err) {
1669 if (vp != NULL && dvp != vp)
1670 vput(vp);
1671 else if (vp != NULL)
1672 vrele(vp);
1673 *vpp = NULL;
1674 }
1675 if (did_lookup)
1676 fdisp_destroy(&fdi);
1677
1678 return err;
1679 }
1680
1681 /*
1682 struct vnop_mkdir_args {
1683 struct vnode *a_dvp;
1684 struct vnode **a_vpp;
1685 struct componentname *a_cnp;
1686 struct vattr *a_vap;
1687 };
1688 */
1689 static int
fuse_vnop_mkdir(struct vop_mkdir_args * ap)1690 fuse_vnop_mkdir(struct vop_mkdir_args *ap)
1691 {
1692 struct vnode *dvp = ap->a_dvp;
1693 struct vnode **vpp = ap->a_vpp;
1694 struct componentname *cnp = ap->a_cnp;
1695 struct vattr *vap = ap->a_vap;
1696
1697 struct fuse_mkdir_in fmdi;
1698
1699 if (fuse_isdeadfs(dvp)) {
1700 return (EXTERROR(ENXIO, "This FUSE session is about "
1701 "to be closed"));
1702 }
1703 fmdi.mode = MAKEIMODE(vap->va_type, vap->va_mode);
1704 fmdi.umask = curthread->td_proc->p_pd->pd_cmask;
1705
1706 return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKDIR, &fmdi,
1707 sizeof(fmdi), VDIR));
1708 }
1709
1710 /*
1711 struct vnop_mknod_args {
1712 struct vnode *a_dvp;
1713 struct vnode **a_vpp;
1714 struct componentname *a_cnp;
1715 struct vattr *a_vap;
1716 };
1717 */
1718 static int
fuse_vnop_mknod(struct vop_mknod_args * ap)1719 fuse_vnop_mknod(struct vop_mknod_args *ap)
1720 {
1721
1722 struct vnode *dvp = ap->a_dvp;
1723 struct vnode **vpp = ap->a_vpp;
1724 struct componentname *cnp = ap->a_cnp;
1725 struct vattr *vap = ap->a_vap;
1726
1727 if (fuse_isdeadfs(dvp))
1728 return (EXTERROR(ENXIO, "This FUSE session is about "
1729 "to be closed"));
1730
1731 return fuse_internal_mknod(dvp, vpp, cnp, vap);
1732 }
1733
1734 /*
1735 struct vop_open_args {
1736 struct vnode *a_vp;
1737 int a_mode;
1738 struct ucred *a_cred;
1739 struct thread *a_td;
1740 int a_fdidx; / struct file *a_fp;
1741 };
1742 */
1743 static int
fuse_vnop_open(struct vop_open_args * ap)1744 fuse_vnop_open(struct vop_open_args *ap)
1745 {
1746 struct vnode *vp = ap->a_vp;
1747 int a_mode = ap->a_mode;
1748 struct thread *td = ap->a_td;
1749 struct ucred *cred = ap->a_cred;
1750 pid_t pid = td->td_proc->p_pid;
1751
1752 if (fuse_isdeadfs(vp))
1753 return (EXTERROR(ENXIO, "This FUSE session is about "
1754 "to be closed"));
1755 if (VN_ISDEV(vp) || vp->v_type == VFIFO)
1756 return (EXTERROR(EOPNOTSUPP, "Unsupported vnode type",
1757 vp->v_type));
1758 if ((a_mode & (FREAD | FWRITE | FEXEC)) == 0)
1759 return (EXTERROR(EINVAL, "Illegal mode", a_mode));
1760
1761 if (fuse_filehandle_validrw(vp, a_mode, cred, pid)) {
1762 fuse_vnode_open(vp, 0, td);
1763 return 0;
1764 }
1765
1766 return fuse_filehandle_open(vp, a_mode, NULL, td, cred);
1767 }
1768
1769 static int
fuse_vnop_pathconf(struct vop_pathconf_args * ap)1770 fuse_vnop_pathconf(struct vop_pathconf_args *ap)
1771 {
1772 struct vnode *vp = ap->a_vp;
1773 struct mount *mp;
1774 struct fuse_filehandle *fufh;
1775 int err;
1776 bool closefufh = false;
1777
1778 switch (ap->a_name) {
1779 case _PC_FILESIZEBITS:
1780 *ap->a_retval = 64;
1781 return (0);
1782 case _PC_NAME_MAX:
1783 *ap->a_retval = NAME_MAX;
1784 return (0);
1785 case _PC_LINK_MAX:
1786 *ap->a_retval = MIN(LONG_MAX, FUSE_LINK_MAX);
1787 return (0);
1788 case _PC_SYMLINK_MAX:
1789 *ap->a_retval = MAXPATHLEN;
1790 return (0);
1791 case _PC_NO_TRUNC:
1792 *ap->a_retval = 1;
1793 return (0);
1794 case _PC_MIN_HOLE_SIZE:
1795 /*
1796 * The FUSE protocol provides no mechanism for a server to
1797 * report _PC_MIN_HOLE_SIZE. It's a protocol bug. Instead,
1798 * return EINVAL if the server does not support FUSE_LSEEK, or
1799 * 1 if it does.
1800 */
1801 mp = vnode_mount(vp);
1802 if (!fsess_is_impl(mp, FUSE_LSEEK) &&
1803 !fsess_not_impl(mp, FUSE_LSEEK)) {
1804 off_t offset = 0;
1805
1806 /*
1807 * Issue a FUSE_LSEEK to find out if it's supported.
1808 * Use SEEK_DATA instead of SEEK_HOLE, because the
1809 * latter generally requires sequential scans of file
1810 * metadata, which can be slow.
1811 */
1812 err = fuse_vnop_do_lseek(vp, curthread,
1813 curthread->td_ucred, curthread->td_proc->p_pid,
1814 &offset, SEEK_DATA);
1815 if (err == EBADF) {
1816 /*
1817 * pathconf() doesn't necessarily open the
1818 * file. So we may need to do it here.
1819 */
1820 err = fuse_filehandle_open(vp, FREAD, &fufh,
1821 curthread, curthread->td_ucred);
1822 if (err == 0) {
1823 closefufh = true;
1824 err = fuse_vnop_do_lseek(vp, curthread,
1825 curthread->td_ucred,
1826 curthread->td_proc->p_pid, &offset,
1827 SEEK_DATA);
1828 }
1829 if (closefufh)
1830 fuse_filehandle_close(vp, fufh,
1831 curthread, curthread->td_ucred);
1832 }
1833
1834 }
1835
1836 if (fsess_is_impl(mp, FUSE_LSEEK)) {
1837 *ap->a_retval = 1;
1838 return (0);
1839 } else if (fsess_not_impl(mp, FUSE_LSEEK)) {
1840 /* FUSE_LSEEK is not implemented */
1841 return (EXTERROR(EINVAL, "This server does not "
1842 "implement FUSE_LSEEK"));
1843 } else {
1844 return (err);
1845 }
1846 default:
1847 return (vop_stdpathconf(ap));
1848 }
1849 }
1850
1851 SDT_PROBE_DEFINE3(fusefs, , vnops, filehandles_closed, "struct vnode*",
1852 "struct uio*", "struct ucred*");
1853 /*
1854 struct vnop_read_args {
1855 struct vnode *a_vp;
1856 struct uio *a_uio;
1857 int a_ioflag;
1858 struct ucred *a_cred;
1859 };
1860 */
1861 static int
fuse_vnop_read(struct vop_read_args * ap)1862 fuse_vnop_read(struct vop_read_args *ap)
1863 {
1864 struct vnode *vp = ap->a_vp;
1865 struct uio *uio = ap->a_uio;
1866 int ioflag = ap->a_ioflag;
1867 struct ucred *cred = ap->a_cred;
1868 pid_t pid = curthread->td_proc->p_pid;
1869 struct fuse_filehandle *fufh;
1870 int err;
1871 bool closefufh = false, directio;
1872
1873 MPASS(vp->v_type == VREG || vp->v_type == VDIR);
1874
1875 if (fuse_isdeadfs(vp)) {
1876 return (EXTERROR(ENXIO, "This FUSE session is about "
1877 "to be closed"));
1878 }
1879
1880 if (VTOFUD(vp)->flag & FN_DIRECTIO) {
1881 ioflag |= IO_DIRECT;
1882 }
1883
1884 err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid);
1885 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
1886 /*
1887 * nfsd will do I/O without first doing VOP_OPEN. We
1888 * must implicitly open the file here
1889 */
1890 err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred);
1891 closefufh = true;
1892 }
1893 if (err) {
1894 SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred);
1895 return err;
1896 }
1897
1898 /*
1899 * Ideally, when the daemon asks for direct io at open time, the
1900 * standard file flag should be set according to this, so that would
1901 * just change the default mode, which later on could be changed via
1902 * fcntl(2).
1903 * But this doesn't work, the O_DIRECT flag gets cleared at some point
1904 * (don't know where). So to make any use of the Fuse direct_io option,
1905 * we hardwire it into the file's private data (similarly to Linux,
1906 * btw.).
1907 */
1908 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
1909
1910 fuse_vnode_update(vp, FN_ATIMECHANGE);
1911 if (directio) {
1912 SDT_PROBE2(fusefs, , vnops, trace, 1, "direct read of vnode");
1913 err = fuse_read_directbackend(vp, uio, cred, fufh);
1914 } else {
1915 SDT_PROBE2(fusefs, , vnops, trace, 1, "buffered read of vnode");
1916 err = fuse_read_biobackend(vp, uio, ioflag, cred, fufh, pid);
1917 }
1918
1919 if (closefufh)
1920 fuse_filehandle_close(vp, fufh, curthread, cred);
1921
1922 return (err);
1923 }
1924
1925 /*
1926 struct vnop_readdir_args {
1927 struct vnode *a_vp;
1928 struct uio *a_uio;
1929 struct ucred *a_cred;
1930 int *a_eofflag;
1931 int *a_ncookies;
1932 uint64_t **a_cookies;
1933 };
1934 */
1935 static int
fuse_vnop_readdir(struct vop_readdir_args * ap)1936 fuse_vnop_readdir(struct vop_readdir_args *ap)
1937 {
1938 struct vnode *vp = ap->a_vp;
1939 struct uio *uio = ap->a_uio;
1940 struct ucred *cred = ap->a_cred;
1941 struct fuse_filehandle *fufh = NULL;
1942 struct mount *mp = vnode_mount(vp);
1943 struct fuse_iov cookediov;
1944 int err = 0;
1945 uint64_t *cookies;
1946 ssize_t tresid;
1947 int ncookies;
1948 bool closefufh = false;
1949 pid_t pid = curthread->td_proc->p_pid;
1950
1951 if (ap->a_eofflag)
1952 *ap->a_eofflag = 0;
1953 if (fuse_isdeadfs(vp)) {
1954 return (EXTERROR(ENXIO, "This FUSE session is about "
1955 "to be closed"));
1956 }
1957 if (uio_resid(uio) < sizeof(struct dirent))
1958 return (EXTERROR(EINVAL, "Buffer is too small"));
1959
1960 tresid = uio->uio_resid;
1961 err = fuse_filehandle_get_dir(vp, &fufh, cred, pid);
1962 if (err == EBADF && mp->mnt_flag & MNT_EXPORTED) {
1963 KASSERT(!fsess_is_impl(mp, FUSE_OPENDIR),
1964 ("FUSE file systems that implement "
1965 "FUSE_OPENDIR should not be exported"));
1966 /*
1967 * nfsd will do VOP_READDIR without first doing VOP_OPEN. We
1968 * must implicitly open the directory here.
1969 */
1970 err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred);
1971 closefufh = true;
1972 }
1973 if (err)
1974 return (err);
1975 if (ap->a_ncookies != NULL) {
1976 ncookies = uio->uio_resid /
1977 (offsetof(struct dirent, d_name) + 4) + 1;
1978 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
1979 *ap->a_ncookies = ncookies;
1980 *ap->a_cookies = cookies;
1981 } else {
1982 ncookies = 0;
1983 cookies = NULL;
1984 }
1985 #define DIRCOOKEDSIZE FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + MAXNAMLEN + 1)
1986 fiov_init(&cookediov, DIRCOOKEDSIZE);
1987
1988 err = fuse_internal_readdir(vp, uio, fufh, &cookediov,
1989 &ncookies, cookies);
1990
1991 fiov_teardown(&cookediov);
1992 if (closefufh)
1993 fuse_filehandle_close(vp, fufh, curthread, cred);
1994
1995 if (ap->a_ncookies != NULL) {
1996 if (err == 0) {
1997 *ap->a_ncookies -= ncookies;
1998 } else {
1999 free(*ap->a_cookies, M_TEMP);
2000 *ap->a_ncookies = 0;
2001 *ap->a_cookies = NULL;
2002 }
2003 }
2004 if (err == 0 && tresid == uio->uio_resid)
2005 *ap->a_eofflag = 1;
2006
2007 return err;
2008 }
2009
2010 /*
2011 struct vnop_readlink_args {
2012 struct vnode *a_vp;
2013 struct uio *a_uio;
2014 struct ucred *a_cred;
2015 };
2016 */
2017 static int
fuse_vnop_readlink(struct vop_readlink_args * ap)2018 fuse_vnop_readlink(struct vop_readlink_args *ap)
2019 {
2020 struct vnode *vp = ap->a_vp;
2021 struct uio *uio = ap->a_uio;
2022 struct ucred *cred = ap->a_cred;
2023
2024 struct fuse_dispatcher fdi;
2025 int err;
2026
2027 if (fuse_isdeadfs(vp)) {
2028 return (EXTERROR(ENXIO, "This FUSE session is about "
2029 "to be closed"));
2030 }
2031 if (!vnode_islnk(vp)) {
2032 return EINVAL;
2033 }
2034 fdisp_init(&fdi, 0);
2035 err = fdisp_simple_putget_vp(&fdi, FUSE_READLINK, vp, curthread, cred);
2036 if (err) {
2037 goto out;
2038 }
2039 if (strnlen(fdi.answ, fdi.iosize) + 1 < fdi.iosize) {
2040 static const char exterr[] = "Server returned an embedded NUL "
2041 "from FUSE_READLINK.";
2042 struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
2043 fuse_warn(data, FSESS_WARN_READLINK_EMBEDDED_NUL, exterr);
2044 err = EXTERROR(EIO, exterr);
2045 goto out;
2046 }
2047 if (((char *)fdi.answ)[0] == '/' &&
2048 fuse_get_mpdata(vnode_mount(vp))->dataflags & FSESS_PUSH_SYMLINKS_IN) {
2049 char *mpth = vnode_mount(vp)->mnt_stat.f_mntonname;
2050
2051 err = uiomove(mpth, strlen(mpth), uio);
2052 }
2053 if (!err) {
2054 err = uiomove(fdi.answ, fdi.iosize, uio);
2055 }
2056 out:
2057 fdisp_destroy(&fdi);
2058 return err;
2059 }
2060
2061 /*
2062 struct vnop_reclaim_args {
2063 struct vnode *a_vp;
2064 };
2065 */
2066 static int
fuse_vnop_reclaim(struct vop_reclaim_args * ap)2067 fuse_vnop_reclaim(struct vop_reclaim_args *ap)
2068 {
2069 struct vnode *vp = ap->a_vp;
2070 struct thread *td = curthread;
2071 struct fuse_vnode_data *fvdat = VTOFUD(vp);
2072 struct fuse_filehandle *fufh, *fufh_tmp;
2073
2074 if (!fvdat) {
2075 panic("FUSE: no vnode data during recycling");
2076 }
2077 LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) {
2078 printf("FUSE: vnode being reclaimed with open fufh "
2079 "(type=%#x)", fufh->fufh_type);
2080 fuse_filehandle_close(vp, fufh, td, NULL);
2081 }
2082
2083 if (VTOI(vp) == 1) {
2084 /*
2085 * Don't send FUSE_FORGET for the root inode, because
2086 * we never send FUSE_LOOKUP for it (see
2087 * fuse_vfsop_root) and we don't want the server to see
2088 * mismatched lookup counts.
2089 */
2090 struct fuse_data *data;
2091 struct vnode *vroot;
2092
2093 data = fuse_get_mpdata(vnode_mount(vp));
2094 FUSE_LOCK();
2095 vroot = data->vroot;
2096 data->vroot = NULL;
2097 FUSE_UNLOCK();
2098 if (vroot)
2099 vrele(vroot);
2100 } else if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) {
2101 fuse_internal_forget_send(vnode_mount(vp), td, NULL, VTOI(vp),
2102 fvdat->nlookup);
2103 }
2104 cache_purge(vp);
2105 vfs_hash_remove(vp);
2106 fuse_vnode_destroy(vp);
2107
2108 return 0;
2109 }
2110
2111 /*
2112 struct vnop_remove_args {
2113 struct vnode *a_dvp;
2114 struct vnode *a_vp;
2115 struct componentname *a_cnp;
2116 };
2117 */
2118 static int
fuse_vnop_remove(struct vop_remove_args * ap)2119 fuse_vnop_remove(struct vop_remove_args *ap)
2120 {
2121 struct vnode *dvp = ap->a_dvp;
2122 struct vnode *vp = ap->a_vp;
2123 struct componentname *cnp = ap->a_cnp;
2124
2125 int err;
2126
2127 if (fuse_isdeadfs(vp)) {
2128 return (EXTERROR(ENXIO, "This FUSE session is about "
2129 "to be closed"));
2130 }
2131 if (vnode_isdir(vp)) {
2132 return (EXTERROR(EPERM, "vnode is a directory"));
2133 }
2134
2135 err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK);
2136
2137 return err;
2138 }
2139
2140 /*
2141 struct vnop_rename_args {
2142 struct vnode *a_fdvp;
2143 struct vnode *a_fvp;
2144 struct componentname *a_fcnp;
2145 struct vnode *a_tdvp;
2146 struct vnode *a_tvp;
2147 struct componentname *a_tcnp;
2148 };
2149 */
2150 static int
fuse_vnop_rename(struct vop_rename_args * ap)2151 fuse_vnop_rename(struct vop_rename_args *ap)
2152 {
2153 struct vnode *fdvp = ap->a_fdvp;
2154 struct vnode *fvp = ap->a_fvp;
2155 struct componentname *fcnp = ap->a_fcnp;
2156 struct vnode *tdvp = ap->a_tdvp;
2157 struct vnode *tvp = ap->a_tvp;
2158 struct componentname *tcnp = ap->a_tcnp;
2159 struct fuse_data *data;
2160 bool newparent = fdvp != tdvp;
2161 bool isdir = fvp->v_type == VDIR;
2162 int err = 0;
2163
2164 if (fuse_isdeadfs(fdvp)) {
2165 return (EXTERROR(ENXIO, "This FUSE session is about "
2166 "to be closed"));
2167 }
2168 if (fvp->v_mount != tdvp->v_mount ||
2169 (tvp && fvp->v_mount != tvp->v_mount)) {
2170 SDT_PROBE2(fusefs, , vnops, trace, 1, "cross-device rename");
2171 err = EXTERROR(EXDEV, "Cross-device rename");
2172 goto out;
2173 }
2174 cache_purge(fvp);
2175
2176 /*
2177 * FUSE library is expected to check if target directory is not
2178 * under the source directory in the file system tree.
2179 * Linux performs this check at VFS level.
2180 */
2181 /*
2182 * If source is a directory, and it will get a new parent, user must
2183 * have write permission to it, so ".." can be modified.
2184 */
2185 data = fuse_get_mpdata(vnode_mount(tdvp));
2186 if (data->dataflags & FSESS_DEFAULT_PERMISSIONS && isdir && newparent) {
2187 err = fuse_internal_access(fvp, VWRITE,
2188 curthread, tcnp->cn_cred);
2189 if (err)
2190 goto out;
2191 }
2192 sx_xlock(&data->rename_lock);
2193 err = fuse_internal_rename(fdvp, fcnp, tdvp, tcnp);
2194 if (err == 0) {
2195 if (tdvp != fdvp)
2196 fuse_vnode_setparent(fvp, tdvp);
2197 if (tvp != NULL)
2198 fuse_vnode_setparent(tvp, NULL);
2199 }
2200 sx_unlock(&data->rename_lock);
2201
2202 if (tvp != NULL && tvp != fvp) {
2203 cache_purge(tvp);
2204 }
2205 if (vnode_isdir(fvp)) {
2206 if (((tvp != NULL) && vnode_isdir(tvp)) || vnode_isdir(fvp)) {
2207 cache_purge(tdvp);
2208 }
2209 cache_purge(fdvp);
2210 }
2211 out:
2212 if (tdvp == tvp) {
2213 vrele(tdvp);
2214 } else {
2215 vput(tdvp);
2216 }
2217 if (tvp != NULL) {
2218 vput(tvp);
2219 }
2220 vrele(fdvp);
2221 vrele(fvp);
2222
2223 return err;
2224 }
2225
2226 /*
2227 struct vnop_rmdir_args {
2228 struct vnode *a_dvp;
2229 struct vnode *a_vp;
2230 struct componentname *a_cnp;
2231 } *ap;
2232 */
2233 static int
fuse_vnop_rmdir(struct vop_rmdir_args * ap)2234 fuse_vnop_rmdir(struct vop_rmdir_args *ap)
2235 {
2236 struct vnode *dvp = ap->a_dvp;
2237 struct vnode *vp = ap->a_vp;
2238
2239 int err;
2240
2241 if (fuse_isdeadfs(vp)) {
2242 return (EXTERROR(ENXIO, "This FUSE session is about "
2243 "to be closed"));
2244 }
2245 if (VTOFUD(vp) == VTOFUD(dvp)) {
2246 return (EXTERROR(EINVAL, "Directory to be removed "
2247 "contains itself"));
2248 }
2249 err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR);
2250
2251 return err;
2252 }
2253
2254 /*
2255 struct vnop_setattr_args {
2256 struct vnode *a_vp;
2257 struct vattr *a_vap;
2258 struct ucred *a_cred;
2259 struct thread *a_td;
2260 };
2261 */
2262 static int
fuse_vnop_setattr(struct vop_setattr_args * ap)2263 fuse_vnop_setattr(struct vop_setattr_args *ap)
2264 {
2265 struct vnode *vp = ap->a_vp;
2266 struct vattr *vap = ap->a_vap;
2267 struct ucred *cred = ap->a_cred;
2268 struct thread *td = curthread;
2269 struct mount *mp;
2270 struct fuse_data *data;
2271 struct vattr old_va;
2272 int dataflags;
2273 int err = 0, err2;
2274 accmode_t accmode = 0;
2275 bool checkperm;
2276 bool drop_suid = false;
2277
2278 mp = vnode_mount(vp);
2279 data = fuse_get_mpdata(mp);
2280 dataflags = data->dataflags;
2281 checkperm = dataflags & FSESS_DEFAULT_PERMISSIONS;
2282
2283 if (fuse_isdeadfs(vp)) {
2284 return (EXTERROR(ENXIO, "This FUSE session is about "
2285 "to be closed"));
2286 }
2287
2288 if (vap->va_uid != (uid_t)VNOVAL) {
2289 if (checkperm) {
2290 /* Only root may change a file's owner */
2291 err = priv_check_cred(cred, PRIV_VFS_CHOWN);
2292 if (err) {
2293 /* As a special case, allow the null chown */
2294 err2 = fuse_internal_getattr(vp, &old_va, cred,
2295 td);
2296 if (err2)
2297 return (err2);
2298 if (vap->va_uid != old_va.va_uid)
2299 return err;
2300 drop_suid = true;
2301 }
2302 }
2303 accmode |= VADMIN;
2304 }
2305 if (vap->va_gid != (gid_t)VNOVAL) {
2306 if (checkperm && priv_check_cred(cred, PRIV_VFS_CHOWN))
2307 drop_suid = true;
2308 if (checkperm && !groupmember(vap->va_gid, cred)) {
2309 /*
2310 * Non-root users may only chgrp to one of their own
2311 * groups
2312 */
2313 err = priv_check_cred(cred, PRIV_VFS_CHOWN);
2314 if (err) {
2315 /* As a special case, allow the null chgrp */
2316 err2 = fuse_internal_getattr(vp, &old_va, cred,
2317 td);
2318 if (err2)
2319 return (err2);
2320 if (vap->va_gid != old_va.va_gid)
2321 return err;
2322 }
2323 }
2324 accmode |= VADMIN;
2325 }
2326 if (vap->va_size != VNOVAL) {
2327 switch (vp->v_type) {
2328 case VDIR:
2329 return (EISDIR);
2330 case VLNK:
2331 case VREG:
2332 if (vfs_isrdonly(mp))
2333 return (EROFS);
2334 err = vn_rlimit_trunc(vap->va_size, td);
2335 if (err)
2336 return (err);
2337 break;
2338 default:
2339 /*
2340 * According to POSIX, the result is unspecified
2341 * for file types other than regular files,
2342 * directories and shared memory objects. We
2343 * don't support shared memory objects in the file
2344 * system, and have dubious support for truncating
2345 * symlinks. Just ignore the request in other cases.
2346 */
2347 return (0);
2348 }
2349 /* Don't set accmode. Permission to trunc is checked upstack */
2350 }
2351 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
2352 if (vap->va_vaflags & VA_UTIMES_NULL)
2353 accmode |= VWRITE;
2354 else
2355 accmode |= VADMIN;
2356 }
2357 if (drop_suid) {
2358 if (vap->va_mode != (mode_t)VNOVAL)
2359 vap->va_mode &= ~(S_ISUID | S_ISGID);
2360 else {
2361 err = fuse_internal_getattr(vp, &old_va, cred, td);
2362 if (err)
2363 return (err);
2364 vap->va_mode = old_va.va_mode & ~(S_ISUID | S_ISGID);
2365 }
2366 }
2367 if (vap->va_mode != (mode_t)VNOVAL) {
2368 /* Only root may set the sticky bit on non-directories */
2369 if (checkperm && vp->v_type != VDIR && (vap->va_mode & S_ISTXT)
2370 && priv_check_cred(cred, PRIV_VFS_STICKYFILE))
2371 return EFTYPE;
2372 if (checkperm && (vap->va_mode & S_ISGID)) {
2373 err = fuse_internal_getattr(vp, &old_va, cred, td);
2374 if (err)
2375 return (err);
2376 if (!groupmember(old_va.va_gid, cred)) {
2377 err = priv_check_cred(cred, PRIV_VFS_SETGID);
2378 if (err)
2379 return (err);
2380 }
2381 }
2382 accmode |= VADMIN;
2383 }
2384
2385 if (vfs_isrdonly(mp))
2386 return EROFS;
2387
2388 if (checkperm) {
2389 err = fuse_internal_access(vp, accmode, td, cred);
2390 } else {
2391 err = 0;
2392 }
2393 if (err)
2394 return err;
2395 else
2396 return fuse_internal_setattr(vp, vap, td, cred);
2397 }
2398
2399 /*
2400 struct vnop_strategy_args {
2401 struct vnode *a_vp;
2402 struct buf *a_bp;
2403 };
2404 */
2405 static int
fuse_vnop_strategy(struct vop_strategy_args * ap)2406 fuse_vnop_strategy(struct vop_strategy_args *ap)
2407 {
2408 struct vnode *vp = ap->a_vp;
2409 struct buf *bp = ap->a_bp;
2410
2411 if (!vp || fuse_isdeadfs(vp)) {
2412 bp->b_ioflags |= BIO_ERROR;
2413 bp->b_error = ENXIO;
2414 bufdone(bp);
2415 return 0;
2416 }
2417
2418 /*
2419 * VOP_STRATEGY always returns zero and signals error via bp->b_ioflags.
2420 * fuse_io_strategy sets bp's error fields
2421 */
2422 (void)fuse_io_strategy(vp, bp);
2423
2424 return 0;
2425 }
2426
2427 /*
2428 struct vnop_symlink_args {
2429 struct vnode *a_dvp;
2430 struct vnode **a_vpp;
2431 struct componentname *a_cnp;
2432 struct vattr *a_vap;
2433 char *a_target;
2434 };
2435 */
2436 static int
fuse_vnop_symlink(struct vop_symlink_args * ap)2437 fuse_vnop_symlink(struct vop_symlink_args *ap)
2438 {
2439 struct vnode *dvp = ap->a_dvp;
2440 struct vnode **vpp = ap->a_vpp;
2441 struct componentname *cnp = ap->a_cnp;
2442 const char *target = ap->a_target;
2443
2444 struct fuse_dispatcher fdi;
2445
2446 int err;
2447 size_t len;
2448
2449 if (fuse_isdeadfs(dvp)) {
2450 return (EXTERROR(ENXIO, "This FUSE session is about "
2451 "to be closed"));
2452 }
2453 /*
2454 * Unlike the other creator type calls, here we have to create a message
2455 * where the name of the new entry comes first, and the data describing
2456 * the entry comes second.
2457 * Hence we can't rely on our handy fuse_internal_newentry() routine,
2458 * but put together the message manually and just call the core part.
2459 */
2460
2461 len = strlen(target) + 1;
2462 fdisp_init(&fdi, len + cnp->cn_namelen + 1);
2463 fdisp_make_vp(&fdi, FUSE_SYMLINK, dvp, curthread, NULL);
2464
2465 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
2466 ((char *)fdi.indata)[cnp->cn_namelen] = '\0';
2467 memcpy((char *)fdi.indata + cnp->cn_namelen + 1, target, len);
2468
2469 err = fuse_internal_newentry_core(dvp, vpp, cnp, VLNK, &fdi);
2470 fdisp_destroy(&fdi);
2471 return err;
2472 }
2473
2474 /*
2475 struct vnop_write_args {
2476 struct vnode *a_vp;
2477 struct uio *a_uio;
2478 int a_ioflag;
2479 struct ucred *a_cred;
2480 };
2481 */
2482 static int
fuse_vnop_write(struct vop_write_args * ap)2483 fuse_vnop_write(struct vop_write_args *ap)
2484 {
2485 struct vnode *vp = ap->a_vp;
2486 struct uio *uio = ap->a_uio;
2487 int ioflag = ap->a_ioflag;
2488 struct ucred *cred = ap->a_cred;
2489 pid_t pid = curthread->td_proc->p_pid;
2490 struct fuse_filehandle *fufh;
2491 int err;
2492 bool closefufh = false, directio;
2493
2494 MPASS(vp->v_type == VREG || vp->v_type == VDIR);
2495
2496 if (fuse_isdeadfs(vp)) {
2497 return (EXTERROR(ENXIO, "This FUSE session is about "
2498 "to be closed"));
2499 }
2500
2501 if (VTOFUD(vp)->flag & FN_DIRECTIO) {
2502 ioflag |= IO_DIRECT;
2503 }
2504
2505 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
2506 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
2507 /*
2508 * nfsd will do I/O without first doing VOP_OPEN. We
2509 * must implicitly open the file here
2510 */
2511 err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred);
2512 closefufh = true;
2513 }
2514 if (err) {
2515 SDT_PROBE3(fusefs, , vnops, filehandles_closed, vp, uio, cred);
2516 return err;
2517 }
2518
2519 /*
2520 * Ideally, when the daemon asks for direct io at open time, the
2521 * standard file flag should be set according to this, so that would
2522 * just change the default mode, which later on could be changed via
2523 * fcntl(2).
2524 * But this doesn't work, the O_DIRECT flag gets cleared at some point
2525 * (don't know where). So to make any use of the Fuse direct_io option,
2526 * we hardwire it into the file's private data (similarly to Linux,
2527 * btw.).
2528 */
2529 directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
2530
2531 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE);
2532 if (directio) {
2533 off_t start, end, filesize;
2534 bool pages = (ioflag & IO_VMIO) != 0;
2535
2536 SDT_PROBE2(fusefs, , vnops, trace, 1, "direct write of vnode");
2537
2538 err = fuse_vnode_size(vp, &filesize, cred, curthread);
2539 if (err)
2540 goto out;
2541
2542 start = uio->uio_offset;
2543 end = start + uio->uio_resid;
2544 if (!pages) {
2545 err = fuse_inval_buf_range(vp, filesize, start,
2546 end);
2547 if (err)
2548 goto out;
2549 }
2550 err = fuse_write_directbackend(vp, uio, cred, fufh,
2551 filesize, ioflag, pages);
2552 } else {
2553 SDT_PROBE2(fusefs, , vnops, trace, 1,
2554 "buffered write of vnode");
2555 if (!fsess_opt_writeback(vnode_mount(vp)))
2556 ioflag |= IO_SYNC;
2557 err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag, pid);
2558 }
2559 fuse_internal_clear_suid_on_write(vp, cred, uio->uio_td);
2560
2561 out:
2562 if (closefufh)
2563 fuse_filehandle_close(vp, fufh, curthread, cred);
2564
2565 return (err);
2566 }
2567
2568 static daddr_t
fuse_gbp_getblkno(struct vnode * vp,vm_ooffset_t off)2569 fuse_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
2570 {
2571 const int biosize = fuse_iosize(vp);
2572
2573 return (off / biosize);
2574 }
2575
2576 static int
fuse_gbp_getblksz(struct vnode * vp,daddr_t lbn,long * blksz)2577 fuse_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *blksz)
2578 {
2579 off_t filesize;
2580 int err;
2581 const int biosize = fuse_iosize(vp);
2582
2583 err = fuse_vnode_size(vp, &filesize, NULL, NULL);
2584 if (err) {
2585 /* This will turn into a SIGBUS */
2586 return (EIO);
2587 } else if ((off_t)lbn * biosize >= filesize) {
2588 *blksz = 0;
2589 } else if ((off_t)(lbn + 1) * biosize > filesize) {
2590 *blksz = filesize - (off_t)lbn *biosize;
2591 } else {
2592 *blksz = biosize;
2593 }
2594 return (0);
2595 }
2596
2597 /*
2598 struct vnop_getpages_args {
2599 struct vnode *a_vp;
2600 vm_page_t *a_m;
2601 int a_count;
2602 int a_reqpage;
2603 };
2604 */
2605 static int
fuse_vnop_getpages(struct vop_getpages_args * ap)2606 fuse_vnop_getpages(struct vop_getpages_args *ap)
2607 {
2608 struct vnode *vp = ap->a_vp;
2609
2610 if (!fsess_opt_mmap(vnode_mount(vp))) {
2611 SDT_PROBE2(fusefs, , vnops, trace, 1,
2612 "called on non-cacheable vnode??\n");
2613 return (VM_PAGER_ERROR);
2614 }
2615
2616 return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind,
2617 ap->a_rahead, fuse_gbp_getblkno, fuse_gbp_getblksz));
2618 }
2619
2620 static const char extattr_namespace_separator = '.';
2621
2622 /*
2623 struct vop_getextattr_args {
2624 struct vop_generic_args a_gen;
2625 struct vnode *a_vp;
2626 int a_attrnamespace;
2627 const char *a_name;
2628 struct uio *a_uio;
2629 size_t *a_size;
2630 struct ucred *a_cred;
2631 struct thread *a_td;
2632 };
2633 */
2634 static int
fuse_vnop_getextattr(struct vop_getextattr_args * ap)2635 fuse_vnop_getextattr(struct vop_getextattr_args *ap)
2636 {
2637 struct vnode *vp = ap->a_vp;
2638 struct uio *uio = ap->a_uio;
2639 struct fuse_dispatcher fdi;
2640 struct fuse_getxattr_in *get_xattr_in;
2641 struct fuse_getxattr_out *get_xattr_out;
2642 struct mount *mp = vnode_mount(vp);
2643 struct thread *td = ap->a_td;
2644 struct ucred *cred = ap->a_cred;
2645 char *prefix;
2646 char *attr_str;
2647 size_t len;
2648 int err;
2649
2650 if (fuse_isdeadfs(vp))
2651 return (EXTERROR(ENXIO, "This FUSE session is about "
2652 "to be closed"));
2653
2654 if (fsess_not_impl(mp, FUSE_GETXATTR))
2655 return (EXTERROR(EOPNOTSUPP, "This server does not implement "
2656 "extended attributes"));
2657
2658 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
2659 if (err)
2660 return err;
2661
2662 /* Default to looking for user attributes. */
2663 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
2664 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
2665 else
2666 prefix = EXTATTR_NAMESPACE_USER_STRING;
2667
2668 len = strlen(prefix) + sizeof(extattr_namespace_separator) +
2669 strlen(ap->a_name) + 1;
2670
2671 fdisp_init(&fdi, len + sizeof(*get_xattr_in));
2672 fdisp_make_vp(&fdi, FUSE_GETXATTR, vp, td, cred);
2673
2674 get_xattr_in = fdi.indata;
2675 /*
2676 * Check to see whether we're querying the available size or
2677 * issuing the actual request. If we pass in 0, we get back struct
2678 * fuse_getxattr_out. If we pass in a non-zero size, we get back
2679 * that much data, without the struct fuse_getxattr_out header.
2680 */
2681 if (uio == NULL)
2682 get_xattr_in->size = 0;
2683 else
2684 get_xattr_in->size = uio->uio_resid;
2685
2686 attr_str = (char *)fdi.indata + sizeof(*get_xattr_in);
2687 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
2688 ap->a_name);
2689
2690 err = fdisp_wait_answ(&fdi);
2691 if (err != 0) {
2692 if (err == ENOSYS) {
2693 fsess_set_notimpl(mp, FUSE_GETXATTR);
2694 err = (EXTERROR(EOPNOTSUPP, "This server does not "
2695 "implement extended attributes"));
2696 }
2697 goto out;
2698 }
2699
2700 get_xattr_out = fdi.answ;
2701
2702 if (ap->a_size != NULL)
2703 *ap->a_size = get_xattr_out->size;
2704
2705 if (uio != NULL)
2706 err = uiomove(fdi.answ, fdi.iosize, uio);
2707
2708 out:
2709 fdisp_destroy(&fdi);
2710 return (err);
2711 }
2712
2713 /*
2714 struct vop_setextattr_args {
2715 struct vop_generic_args a_gen;
2716 struct vnode *a_vp;
2717 int a_attrnamespace;
2718 const char *a_name;
2719 struct uio *a_uio;
2720 struct ucred *a_cred;
2721 struct thread *a_td;
2722 };
2723 */
2724 static int
fuse_vnop_setextattr(struct vop_setextattr_args * ap)2725 fuse_vnop_setextattr(struct vop_setextattr_args *ap)
2726 {
2727 struct vnode *vp = ap->a_vp;
2728 struct uio *uio = ap->a_uio;
2729 struct fuse_dispatcher fdi;
2730 struct fuse_setxattr_in *set_xattr_in;
2731 struct mount *mp = vnode_mount(vp);
2732 struct thread *td = ap->a_td;
2733 struct ucred *cred = ap->a_cred;
2734 size_t struct_size = FUSE_COMPAT_SETXATTR_IN_SIZE;
2735 char *prefix;
2736 size_t len;
2737 char *attr_str;
2738 int err;
2739
2740 if (fuse_isdeadfs(vp))
2741 return (EXTERROR(ENXIO, "This FUSE session is about "
2742 "to be closed"));
2743
2744 if (fsess_not_impl(mp, FUSE_SETXATTR))
2745 return (EXTERROR(EOPNOTSUPP, "This server does not implement "
2746 "setting extended attributes"));
2747
2748 if (vfs_isrdonly(mp))
2749 return EROFS;
2750
2751 /* Deleting xattrs must use VOP_DELETEEXTATTR instead */
2752 if (ap->a_uio == NULL) {
2753 /*
2754 * If we got here as fallback from VOP_DELETEEXTATTR, then
2755 * return EOPNOTSUPP.
2756 */
2757 if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
2758 return (EXTERROR(EOPNOTSUPP, "This server does not "
2759 "implement removing extended attributess"));
2760 else
2761 return (EXTERROR(EINVAL, "DELETEEXTATTR should be used "
2762 "to remove extattrs"));
2763 }
2764
2765 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
2766 VWRITE);
2767 if (err)
2768 return err;
2769
2770 /* Default to looking for user attributes. */
2771 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
2772 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
2773 else
2774 prefix = EXTATTR_NAMESPACE_USER_STRING;
2775
2776 len = strlen(prefix) + sizeof(extattr_namespace_separator) +
2777 strlen(ap->a_name) + 1;
2778
2779 /* older FUSE servers use a smaller fuse_setxattr_in struct*/
2780 if (fuse_libabi_geq(fuse_get_mpdata(mp), 7, 33))
2781 struct_size = sizeof(*set_xattr_in);
2782
2783 fdisp_init(&fdi, len + struct_size + uio->uio_resid);
2784 fdisp_make_vp(&fdi, FUSE_SETXATTR, vp, td, cred);
2785
2786 set_xattr_in = fdi.indata;
2787 set_xattr_in->size = uio->uio_resid;
2788
2789 if (fuse_libabi_geq(fuse_get_mpdata(mp), 7, 33)) {
2790 set_xattr_in->setxattr_flags = 0;
2791 set_xattr_in->padding = 0;
2792 }
2793
2794 attr_str = (char *)fdi.indata + struct_size;
2795 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
2796 ap->a_name);
2797
2798 err = uiomove((char *)fdi.indata + struct_size + len,
2799 uio->uio_resid, uio);
2800 if (err != 0) {
2801 goto out;
2802 }
2803
2804 err = fdisp_wait_answ(&fdi);
2805
2806 if (err == ENOSYS) {
2807 fsess_set_notimpl(mp, FUSE_SETXATTR);
2808 err = EXTERROR(EOPNOTSUPP, "This server does not implement "
2809 "setting extended attributes");
2810 }
2811 if (err == ERESTART) {
2812 /* Can't restart after calling uiomove */
2813 err = EINTR;
2814 }
2815
2816 out:
2817 fdisp_destroy(&fdi);
2818 return (err);
2819 }
2820
2821 /*
2822 * The Linux / FUSE extended attribute list is simply a collection of
2823 * NUL-terminated strings. The FreeBSD extended attribute list is a single
2824 * byte length followed by a non-NUL terminated string. So, this allows
2825 * conversion of the Linux / FUSE format to the FreeBSD format in place.
2826 * Linux attribute names are reported with the namespace as a prefix (e.g.
2827 * "user.attribute_name"), but in FreeBSD they are reported without the
2828 * namespace prefix (e.g. "attribute_name"). So, we're going from:
2829 *
2830 * user.attr_name1\0user.attr_name2\0
2831 *
2832 * to:
2833 *
2834 * <num>attr_name1<num>attr_name2
2835 *
2836 * Where "<num>" is a single byte number of characters in the attribute name.
2837 *
2838 * Args:
2839 * prefix - exattr namespace prefix string
2840 * list, list_len - input list with namespace prefixes
2841 * bsd_list, bsd_list_len - output list compatible with bsd vfs
2842 */
2843 static int
fuse_xattrlist_convert(char * prefix,const char * list,int list_len,char * bsd_list,int * bsd_list_len)2844 fuse_xattrlist_convert(char *prefix, const char *list, int list_len,
2845 char *bsd_list, int *bsd_list_len)
2846 {
2847 int len, pos, dist_to_next, prefix_len;
2848
2849 pos = 0;
2850 *bsd_list_len = 0;
2851 prefix_len = strlen(prefix);
2852
2853 while (pos < list_len && list[pos] != '\0') {
2854 dist_to_next = strlen(&list[pos]) + 1;
2855 if (bcmp(&list[pos], prefix, prefix_len) == 0 &&
2856 list[pos + prefix_len] == extattr_namespace_separator) {
2857 len = dist_to_next -
2858 (prefix_len + sizeof(extattr_namespace_separator)) - 1;
2859 if (len >= EXTATTR_MAXNAMELEN)
2860 return (ENAMETOOLONG);
2861
2862 bsd_list[*bsd_list_len] = len;
2863 memcpy(&bsd_list[*bsd_list_len + 1],
2864 &list[pos + prefix_len +
2865 sizeof(extattr_namespace_separator)], len);
2866
2867 *bsd_list_len += len + 1;
2868 }
2869
2870 pos += dist_to_next;
2871 }
2872
2873 return (0);
2874 }
2875
2876 /*
2877 * List extended attributes
2878 *
2879 * The FUSE_LISTXATTR operation is based on Linux's listxattr(2) syscall, which
2880 * has a number of differences compared to its FreeBSD equivalent,
2881 * extattr_list_file:
2882 *
2883 * - FUSE_LISTXATTR returns all extended attributes across all namespaces,
2884 * whereas listxattr(2) only returns attributes for a single namespace
2885 * - FUSE_LISTXATTR prepends each attribute name with "namespace."
2886 * - If the provided buffer is not large enough to hold the result,
2887 * FUSE_LISTXATTR should return ERANGE, whereas listxattr is expected to
2888 * return as many results as will fit.
2889 */
2890 /*
2891 struct vop_listextattr_args {
2892 struct vop_generic_args a_gen;
2893 struct vnode *a_vp;
2894 int a_attrnamespace;
2895 struct uio *a_uio;
2896 size_t *a_size;
2897 struct ucred *a_cred;
2898 struct thread *a_td;
2899 };
2900 */
2901 static int
fuse_vnop_listextattr(struct vop_listextattr_args * ap)2902 fuse_vnop_listextattr(struct vop_listextattr_args *ap)
2903 {
2904 struct vnode *vp = ap->a_vp;
2905 struct uio *uio = ap->a_uio;
2906 struct fuse_dispatcher fdi;
2907 struct fuse_listxattr_in *list_xattr_in;
2908 struct fuse_listxattr_out *list_xattr_out;
2909 struct mount *mp = vnode_mount(vp);
2910 struct thread *td = ap->a_td;
2911 struct ucred *cred = ap->a_cred;
2912 char *prefix;
2913 char *bsd_list = NULL;
2914 char *linux_list;
2915 int bsd_list_len;
2916 int linux_list_len;
2917 int err;
2918
2919 if (fuse_isdeadfs(vp))
2920 return (EXTERROR(ENXIO, "This FUSE session is about "
2921 "to be closed"));
2922
2923 if (fsess_not_impl(mp, FUSE_LISTXATTR))
2924 return (EXTERROR(EOPNOTSUPP, "This server does not implement "
2925 "extended attributes"));
2926
2927 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
2928 if (err)
2929 return err;
2930
2931 /*
2932 * Add space for a NUL and the period separator if enabled.
2933 * Default to looking for user attributes.
2934 */
2935 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
2936 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
2937 else
2938 prefix = EXTATTR_NAMESPACE_USER_STRING;
2939
2940 fdisp_init(&fdi, sizeof(*list_xattr_in));
2941 fdisp_make_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
2942
2943 /*
2944 * Retrieve Linux / FUSE compatible list size.
2945 */
2946 list_xattr_in = fdi.indata;
2947 list_xattr_in->size = 0;
2948
2949 err = fdisp_wait_answ(&fdi);
2950 if (err != 0) {
2951 if (err == ENOSYS) {
2952 fsess_set_notimpl(mp, FUSE_LISTXATTR);
2953 err = EXTERROR(EOPNOTSUPP, "This server does not "
2954 "implement extended attributes");
2955 }
2956 goto out;
2957 }
2958
2959 list_xattr_out = fdi.answ;
2960 linux_list_len = list_xattr_out->size;
2961 if (linux_list_len == 0) {
2962 if (ap->a_size != NULL)
2963 *ap->a_size = linux_list_len;
2964 goto out;
2965 }
2966
2967 /*
2968 * Retrieve Linux / FUSE compatible list values.
2969 */
2970 fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
2971 list_xattr_in = fdi.indata;
2972 list_xattr_in->size = linux_list_len;
2973
2974 err = fdisp_wait_answ(&fdi);
2975 if (err == ERANGE) {
2976 /*
2977 * Race detected. The attribute list must've grown since the
2978 * first FUSE_LISTXATTR call. Start over. Go all the way back
2979 * to userland so we can process signals, if necessary, before
2980 * restarting.
2981 */
2982 err = ERESTART;
2983 goto out;
2984 } else if (err != 0)
2985 goto out;
2986
2987 linux_list = fdi.answ;
2988 /* FUSE doesn't allow the server to return more data than requested */
2989 if (fdi.iosize > linux_list_len) {
2990 struct fuse_data *data = fuse_get_mpdata(mp);
2991
2992 fuse_warn(data, FSESS_WARN_LSEXTATTR_LONG,
2993 "server returned "
2994 "more extended attribute data than requested; "
2995 "should've returned ERANGE instead.");
2996 } else {
2997 /* But returning less data is fine */
2998 linux_list_len = fdi.iosize;
2999 }
3000
3001 /*
3002 * Retrieve the BSD compatible list values.
3003 * The Linux / FUSE attribute list format isn't the same
3004 * as FreeBSD's format. So we need to transform it into
3005 * FreeBSD's format before giving it to the user.
3006 */
3007 bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK);
3008 err = fuse_xattrlist_convert(prefix, linux_list, linux_list_len,
3009 bsd_list, &bsd_list_len);
3010 if (err != 0)
3011 goto out;
3012
3013 if (ap->a_size != NULL)
3014 *ap->a_size = bsd_list_len;
3015
3016 if (uio != NULL)
3017 err = uiomove(bsd_list, bsd_list_len, uio);
3018
3019 out:
3020 free(bsd_list, M_TEMP);
3021 fdisp_destroy(&fdi);
3022 return (err);
3023 }
3024
3025 /*
3026 struct vop_deallocate_args {
3027 struct vop_generic_args a_gen;
3028 struct vnode *a_vp;
3029 off_t *a_offset;
3030 off_t *a_len;
3031 int a_flags;
3032 int a_ioflag;
3033 struct ucred *a_cred;
3034 };
3035 */
3036 static int
fuse_vnop_deallocate(struct vop_deallocate_args * ap)3037 fuse_vnop_deallocate(struct vop_deallocate_args *ap)
3038 {
3039 struct vnode *vp = ap->a_vp;
3040 struct mount *mp = vnode_mount(vp);
3041 struct fuse_filehandle *fufh;
3042 struct fuse_dispatcher fdi;
3043 struct fuse_fallocate_in *ffi;
3044 struct ucred *cred = ap->a_cred;
3045 pid_t pid = curthread->td_proc->p_pid;
3046 off_t *len = ap->a_len;
3047 off_t *offset = ap->a_offset;
3048 int ioflag = ap->a_ioflag;
3049 off_t filesize;
3050 int err;
3051 bool closefufh = false;
3052
3053 if (fuse_isdeadfs(vp))
3054 return (EXTERROR(ENXIO, "This FUSE session is about "
3055 "to be closed"));
3056
3057 if (vfs_isrdonly(mp))
3058 return (EROFS);
3059
3060 if (fsess_not_impl(mp, FUSE_FALLOCATE))
3061 goto fallback;
3062
3063 err = fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
3064 if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
3065 /*
3066 * nfsd will do I/O without first doing VOP_OPEN. We
3067 * must implicitly open the file here
3068 */
3069 err = fuse_filehandle_open(vp, FWRITE, &fufh, curthread, cred);
3070 closefufh = true;
3071 }
3072 if (err)
3073 return (err);
3074
3075 fuse_vnode_update(vp, FN_MTIMECHANGE | FN_CTIMECHANGE);
3076
3077 err = fuse_vnode_size(vp, &filesize, cred, curthread);
3078 if (err)
3079 goto out;
3080 fuse_inval_buf_range(vp, filesize, *offset, *offset + *len);
3081
3082 fdisp_init(&fdi, sizeof(*ffi));
3083 fdisp_make_vp(&fdi, FUSE_FALLOCATE, vp, curthread, cred);
3084 ffi = fdi.indata;
3085 ffi->fh = fufh->fh_id;
3086 ffi->offset = *offset;
3087 ffi->length = *len;
3088 /*
3089 * FreeBSD's fspacectl is equivalent to Linux's fallocate with
3090 * mode == FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE
3091 */
3092 ffi->mode = FUSE_FALLOC_FL_PUNCH_HOLE | FUSE_FALLOC_FL_KEEP_SIZE;
3093 err = fdisp_wait_answ(&fdi);
3094
3095 if (err == ENOSYS) {
3096 fdisp_destroy(&fdi);
3097 fsess_set_notimpl(mp, FUSE_FALLOCATE);
3098 goto fallback;
3099 } else if (err == EOPNOTSUPP) {
3100 /*
3101 * The file system server does not support FUSE_FALLOCATE with
3102 * the supplied mode for this particular file.
3103 */
3104 fdisp_destroy(&fdi);
3105 goto fallback;
3106 } else if (!err) {
3107 /*
3108 * Clip the returned offset to EoF. Do it here rather than
3109 * before FUSE_FALLOCATE just in case the kernel's cached file
3110 * size is out of date. Unfortunately, FUSE does not return
3111 * any information about filesize from that operation.
3112 */
3113 *offset = MIN(*offset + *len, filesize);
3114 *len = 0;
3115 fuse_vnode_undirty_cached_timestamps(vp, false);
3116 fuse_internal_clear_suid_on_write(vp, cred, curthread);
3117
3118 if (ioflag & IO_SYNC)
3119 err = fuse_internal_fsync(vp, curthread, MNT_WAIT,
3120 false);
3121 }
3122
3123 fdisp_destroy(&fdi);
3124 out:
3125 if (closefufh)
3126 fuse_filehandle_close(vp, fufh, curthread, cred);
3127
3128 return (err);
3129
3130 fallback:
3131 if (closefufh)
3132 fuse_filehandle_close(vp, fufh, curthread, cred);
3133
3134 return (vop_stddeallocate(ap));
3135 }
3136
3137 /*
3138 struct vop_deleteextattr_args {
3139 struct vop_generic_args a_gen;
3140 struct vnode *a_vp;
3141 int a_attrnamespace;
3142 const char *a_name;
3143 struct ucred *a_cred;
3144 struct thread *a_td;
3145 };
3146 */
3147 static int
fuse_vnop_deleteextattr(struct vop_deleteextattr_args * ap)3148 fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap)
3149 {
3150 struct vnode *vp = ap->a_vp;
3151 struct fuse_dispatcher fdi;
3152 struct mount *mp = vnode_mount(vp);
3153 struct thread *td = ap->a_td;
3154 struct ucred *cred = ap->a_cred;
3155 char *prefix;
3156 size_t len;
3157 char *attr_str;
3158 int err;
3159
3160 if (fuse_isdeadfs(vp))
3161 return (EXTERROR(ENXIO, "This FUSE session is about "
3162 "to be closed"));
3163
3164 if (fsess_not_impl(mp, FUSE_REMOVEXATTR))
3165 return (EXTERROR(EOPNOTSUPP, "This server does not implement "
3166 "removing extended attributes"));
3167
3168 if (vfs_isrdonly(mp))
3169 return EROFS;
3170
3171 err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
3172 VWRITE);
3173 if (err)
3174 return err;
3175
3176 /* Default to looking for user attributes. */
3177 if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
3178 prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
3179 else
3180 prefix = EXTATTR_NAMESPACE_USER_STRING;
3181
3182 len = strlen(prefix) + sizeof(extattr_namespace_separator) +
3183 strlen(ap->a_name) + 1;
3184
3185 fdisp_init(&fdi, len);
3186 fdisp_make_vp(&fdi, FUSE_REMOVEXATTR, vp, td, cred);
3187
3188 attr_str = fdi.indata;
3189 snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
3190 ap->a_name);
3191
3192 err = fdisp_wait_answ(&fdi);
3193 if (err == ENOSYS) {
3194 fsess_set_notimpl(mp, FUSE_REMOVEXATTR);
3195 err = EXTERROR(EOPNOTSUPP, "This server does not implement "
3196 "removing extended attributes");
3197 }
3198
3199 fdisp_destroy(&fdi);
3200 return (err);
3201 }
3202
3203 /*
3204 struct vnop_print_args {
3205 struct vnode *a_vp;
3206 };
3207 */
3208 static int
fuse_vnop_print(struct vop_print_args * ap)3209 fuse_vnop_print(struct vop_print_args *ap)
3210 {
3211 struct fuse_vnode_data *fvdat = VTOFUD(ap->a_vp);
3212
3213 printf("nodeid: %ju, parent nodeid: %ju, nlookup: %ju, flag: %#x\n",
3214 (uintmax_t)VTOILLU(ap->a_vp), (uintmax_t)fvdat->parent_nid,
3215 (uintmax_t)fvdat->nlookup,
3216 fvdat->flag);
3217
3218 return 0;
3219 }
3220
3221 /*
3222 * Get an NFS filehandle for a FUSE file.
3223 *
3224 * This will only work for FUSE file systems that guarantee the uniqueness of
3225 * nodeid:generation, which most don't.
3226 */
3227 /*
3228 vop_vptofh {
3229 IN struct vnode *a_vp;
3230 IN struct fid *a_fhp;
3231 };
3232 */
3233 static int
fuse_vnop_vptofh(struct vop_vptofh_args * ap)3234 fuse_vnop_vptofh(struct vop_vptofh_args *ap)
3235 {
3236 struct vnode *vp = ap->a_vp;
3237 struct fuse_vnode_data *fvdat = VTOFUD(vp);
3238 struct fuse_fid *fhp = (struct fuse_fid *)(ap->a_fhp);
3239 _Static_assert(sizeof(struct fuse_fid) <= sizeof(struct fid),
3240 "FUSE fid type is too big");
3241 struct mount *mp = vnode_mount(vp);
3242 struct fuse_data *data = fuse_get_mpdata(mp);
3243 struct vattr va;
3244 int err;
3245
3246 if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) {
3247 /* NFS requires lookups for "." and ".." */
3248 SDT_PROBE2(fusefs, , vnops, trace, 1,
3249 "VOP_VPTOFH without FUSE_EXPORT_SUPPORT");
3250 return (EXTERROR(EOPNOTSUPP, "This server is "
3251 "missing FUSE_EXPORT_SUPPORT"));
3252 }
3253 if ((mp->mnt_flag & MNT_EXPORTED) &&
3254 fsess_is_impl(mp, FUSE_OPENDIR))
3255 {
3256 /*
3257 * NFS is stateless, so nfsd must reopen a directory on every
3258 * call to VOP_READDIR, passing in the d_off field from the
3259 * final dirent of the previous invocation. But if the server
3260 * implements FUSE_OPENDIR, the FUSE protocol does not
3261 * guarantee that d_off will be valid after a directory is
3262 * closed and reopened. So prohibit exporting FUSE file
3263 * systems that implement FUSE_OPENDIR.
3264 *
3265 * But userspace NFS servers don't have this problem.
3266 */
3267 SDT_PROBE2(fusefs, , vnops, trace, 1,
3268 "VOP_VPTOFH with FUSE_OPENDIR");
3269 return (EXTERROR(EOPNOTSUPP, "This server implements "
3270 "FUSE_OPENDIR so is not compatible with getfh"));
3271 }
3272
3273 err = fuse_internal_getattr(vp, &va, curthread->td_ucred, curthread);
3274 if (err)
3275 return err;
3276
3277 /*ip = VTOI(ap->a_vp);*/
3278 /*ufhp = (struct ufid *)ap->a_fhp;*/
3279 fhp->len = sizeof(struct fuse_fid);
3280 fhp->nid = fvdat->nid;
3281 if (fvdat->generation <= UINT32_MAX)
3282 fhp->gen = fvdat->generation;
3283 else
3284 return (EXTERROR(EOVERFLOW, "inode generation "
3285 "number overflow"));
3286 return (0);
3287 }
3288