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/systm.h>
65 #include <sys/counter.h>
66 #include <sys/module.h>
67 #include <sys/errno.h>
68 #include <sys/kernel.h>
69 #include <sys/conf.h>
70 #include <sys/uio.h>
71 #include <sys/malloc.h>
72 #include <sys/queue.h>
73 #include <sys/lock.h>
74 #include <sys/mutex.h>
75 #include <sys/sdt.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/stat.h>
82 #include <sys/unistd.h>
83 #include <sys/filedesc.h>
84 #include <sys/file.h>
85 #include <sys/fcntl.h>
86 #include <sys/dirent.h>
87 #include <sys/bio.h>
88 #include <sys/buf.h>
89 #include <sys/sysctl.h>
90 #include <sys/priv.h>
91
92 #include "fuse.h"
93 #include "fuse_file.h"
94 #include "fuse_internal.h"
95 #include "fuse_io.h"
96 #include "fuse_ipc.h"
97 #include "fuse_node.h"
98 #include "fuse_file.h"
99
100 SDT_PROVIDER_DECLARE(fusefs);
101 /*
102 * Fuse trace probe:
103 * arg0: verbosity. Higher numbers give more verbose messages
104 * arg1: Textual message
105 */
106 SDT_PROBE_DEFINE2(fusefs, , internal, trace, "int", "char*");
107
108 #ifdef ZERO_PAD_INCOMPLETE_BUFS
109 static int isbzero(void *buf, size_t len);
110
111 #endif
112
113 counter_u64_t fuse_lookup_cache_hits;
114 counter_u64_t fuse_lookup_cache_misses;
115
116 SYSCTL_COUNTER_U64(_vfs_fusefs_stats, OID_AUTO, lookup_cache_hits, CTLFLAG_RD,
117 &fuse_lookup_cache_hits, "number of positive cache hits in lookup");
118
119 SYSCTL_COUNTER_U64(_vfs_fusefs_stats, OID_AUTO, lookup_cache_misses, CTLFLAG_RD,
120 &fuse_lookup_cache_misses, "number of cache misses in lookup");
121
122 int
fuse_internal_get_cached_vnode(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)123 fuse_internal_get_cached_vnode(struct mount* mp, ino_t ino, int flags,
124 struct vnode **vpp)
125 {
126 struct bintime now;
127 struct thread *td = curthread;
128 uint64_t nodeid = ino;
129 int error;
130
131 *vpp = NULL;
132
133 error = vfs_hash_get(mp, fuse_vnode_hash(nodeid), flags, td, vpp,
134 fuse_vnode_cmp, &nodeid);
135 if (error)
136 return error;
137 /*
138 * Check the entry cache timeout. We have to do this within fusefs
139 * instead of by using cache_enter_time/cache_lookup because those
140 * routines are only intended to work with pathnames, not inodes
141 */
142 if (*vpp != NULL) {
143 getbinuptime(&now);
144 if (bintime_cmp(&(VTOFUD(*vpp)->entry_cache_timeout), &now, >)){
145 counter_u64_add(fuse_lookup_cache_hits, 1);
146 return 0;
147 } else {
148 /* Entry cache timeout */
149 counter_u64_add(fuse_lookup_cache_misses, 1);
150 cache_purge(*vpp);
151 vput(*vpp);
152 *vpp = NULL;
153 }
154 }
155 return 0;
156 }
157
158 SDT_PROBE_DEFINE0(fusefs, , internal, access_vadmin);
159 /* Synchronously send a FUSE_ACCESS operation */
160 int
fuse_internal_access(struct vnode * vp,accmode_t mode,struct thread * td,struct ucred * cred)161 fuse_internal_access(struct vnode *vp,
162 accmode_t mode,
163 struct thread *td,
164 struct ucred *cred)
165 {
166 int err = 0;
167 uint32_t mask = F_OK;
168 int dataflags;
169 struct mount *mp;
170 struct fuse_dispatcher fdi;
171 struct fuse_access_in *fai;
172 struct fuse_data *data;
173
174 mp = vnode_mount(vp);
175
176 data = fuse_get_mpdata(mp);
177 dataflags = data->dataflags;
178
179 if (mode == 0)
180 return 0;
181
182 if (mode & VMODIFY_PERMS && vfs_isrdonly(mp)) {
183 switch (vp->v_type) {
184 case VDIR:
185 /* FALLTHROUGH */
186 case VLNK:
187 /* FALLTHROUGH */
188 case VREG:
189 return EROFS;
190 default:
191 break;
192 }
193 }
194
195 /* Unless explicitly permitted, deny everyone except the fs owner. */
196 if (!(dataflags & FSESS_DAEMON_CAN_SPY)) {
197 if (fuse_match_cred(data->daemoncred, cred))
198 return EPERM;
199 }
200
201 if (dataflags & FSESS_DEFAULT_PERMISSIONS) {
202 struct vattr va;
203
204 fuse_internal_getattr(vp, &va, cred, td);
205 return vaccess(vp->v_type, va.va_mode, va.va_uid,
206 va.va_gid, mode, cred);
207 }
208
209 if (mode & VADMIN) {
210 /*
211 * The FUSE protocol doesn't have an equivalent of VADMIN, so
212 * it's a bug if we ever reach this point with that bit set.
213 */
214 SDT_PROBE0(fusefs, , internal, access_vadmin);
215 }
216
217 if (fsess_not_impl(mp, FUSE_ACCESS))
218 return 0;
219
220 if ((mode & (VWRITE | VAPPEND)) != 0)
221 mask |= W_OK;
222 if ((mode & VREAD) != 0)
223 mask |= R_OK;
224 if ((mode & VEXEC) != 0)
225 mask |= X_OK;
226
227 fdisp_init(&fdi, sizeof(*fai));
228 fdisp_make_vp(&fdi, FUSE_ACCESS, vp, td, cred);
229
230 fai = fdi.indata;
231 fai->mask = mask;
232
233 err = fdisp_wait_answ(&fdi);
234 fdisp_destroy(&fdi);
235
236 if (err == ENOSYS) {
237 fsess_set_notimpl(mp, FUSE_ACCESS);
238 err = 0;
239 }
240 return err;
241 }
242
243 /*
244 * Cache FUSE attributes from attr, in attribute cache associated with vnode
245 * 'vp'. Optionally, if argument 'vap' is not NULL, store a copy of the
246 * converted attributes there as well.
247 *
248 * If the nominal attribute cache TTL is zero, do not cache on the 'vp' (but do
249 * return the result to the caller).
250 */
251 void
fuse_internal_cache_attrs(struct vnode * vp,struct fuse_attr * attr,uint64_t attr_valid,uint32_t attr_valid_nsec,struct vattr * vap,bool from_server)252 fuse_internal_cache_attrs(struct vnode *vp, struct fuse_attr *attr,
253 uint64_t attr_valid, uint32_t attr_valid_nsec, struct vattr *vap,
254 bool from_server)
255 {
256 struct mount *mp;
257 struct fuse_vnode_data *fvdat;
258 struct fuse_data *data;
259 struct vattr *vp_cache_at;
260
261 mp = vnode_mount(vp);
262 fvdat = VTOFUD(vp);
263 data = fuse_get_mpdata(mp);
264
265 ASSERT_VOP_ELOCKED(vp, "fuse_internal_cache_attrs");
266
267 fuse_validity_2_bintime(attr_valid, attr_valid_nsec,
268 &fvdat->attr_cache_timeout);
269
270 if (vnode_isreg(vp) &&
271 fvdat->cached_attrs.va_size != VNOVAL &&
272 fvdat->flag & FN_SIZECHANGE &&
273 attr->size != fvdat->cached_attrs.va_size)
274 {
275 if (data->cache_mode == FUSE_CACHE_WB)
276 {
277 const char *msg;
278
279 /*
280 * The server changed the file's size even though we're
281 * using writeback cacheing and and we have outstanding
282 * dirty writes! That's a server bug.
283 */
284 if (fuse_libabi_geq(data, 7, 23)) {
285 msg = "writeback cache incoherent!."
286 "To prevent data corruption, disable "
287 "the writeback cache according to your "
288 "FUSE server's documentation.";
289 } else {
290 msg = "writeback cache incoherent!."
291 "To prevent data corruption, disable "
292 "the writeback cache by setting "
293 "vfs.fusefs.data_cache_mode to 0 or 1.";
294 }
295 fuse_warn(data, FSESS_WARN_WB_CACHE_INCOHERENT, msg);
296 }
297 if (fuse_vnode_attr_cache_valid(vp) &&
298 data->cache_mode != FUSE_CACHE_UC)
299 {
300 /*
301 * The server changed the file's size even though we
302 * have it cached and our cache has not yet expired.
303 * That's a bug.
304 */
305 fuse_warn(data, FSESS_WARN_CACHE_INCOHERENT,
306 "cache incoherent! "
307 "To prevent "
308 "data corruption, disable the data cache "
309 "by mounting with -o direct_io, or as "
310 "directed otherwise by your FUSE server's "
311 "documentation.");
312 }
313 }
314
315 /* Fix our buffers if the filesize changed without us knowing */
316 if (vnode_isreg(vp) && attr->size != fvdat->cached_attrs.va_size) {
317 (void)fuse_vnode_setsize(vp, attr->size, from_server);
318 fvdat->cached_attrs.va_size = attr->size;
319 }
320
321 if (attr_valid > 0 || attr_valid_nsec > 0)
322 vp_cache_at = &(fvdat->cached_attrs);
323 else if (vap != NULL)
324 vp_cache_at = vap;
325 else
326 return;
327
328 vp_cache_at->va_fsid = mp->mnt_stat.f_fsid.val[0];
329 vp_cache_at->va_fileid = attr->ino;
330 vp_cache_at->va_mode = attr->mode & ~S_IFMT;
331 vp_cache_at->va_nlink = attr->nlink;
332 vp_cache_at->va_uid = attr->uid;
333 vp_cache_at->va_gid = attr->gid;
334 vp_cache_at->va_rdev = attr->rdev;
335 vp_cache_at->va_size = attr->size;
336 /* XXX on i386, seconds are truncated to 32 bits */
337 vp_cache_at->va_atime.tv_sec = attr->atime;
338 vp_cache_at->va_atime.tv_nsec = attr->atimensec;
339 vp_cache_at->va_mtime.tv_sec = attr->mtime;
340 vp_cache_at->va_mtime.tv_nsec = attr->mtimensec;
341 vp_cache_at->va_ctime.tv_sec = attr->ctime;
342 vp_cache_at->va_ctime.tv_nsec = attr->ctimensec;
343 if (fuse_libabi_geq(data, 7, 9) && attr->blksize > 0)
344 vp_cache_at->va_blocksize = attr->blksize;
345 else
346 vp_cache_at->va_blocksize = PAGE_SIZE;
347 vp_cache_at->va_type = IFTOVT(attr->mode);
348 vp_cache_at->va_bytes = attr->blocks * S_BLKSIZE;
349 vp_cache_at->va_flags = 0;
350
351 if (vap != vp_cache_at && vap != NULL)
352 memcpy(vap, vp_cache_at, sizeof(*vap));
353 }
354
355 /* fsync */
356
357 int
fuse_internal_fsync_callback(struct fuse_ticket * tick,struct uio * uio)358 fuse_internal_fsync_callback(struct fuse_ticket *tick, struct uio *uio)
359 {
360 if (tick->tk_aw_ohead.error == ENOSYS) {
361 fsess_set_notimpl(tick->tk_data->mp, fticket_opcode(tick));
362 }
363 return 0;
364 }
365
366 int
fuse_internal_fsync(struct vnode * vp,struct thread * td,int waitfor,bool datasync)367 fuse_internal_fsync(struct vnode *vp,
368 struct thread *td,
369 int waitfor,
370 bool datasync)
371 {
372 struct fuse_fsync_in *ffsi = NULL;
373 struct fuse_dispatcher fdi;
374 struct fuse_filehandle *fufh;
375 struct fuse_vnode_data *fvdat = VTOFUD(vp);
376 struct mount *mp = vnode_mount(vp);
377 int op = FUSE_FSYNC;
378 int err = 0;
379
380 if (fsess_not_impl(vnode_mount(vp),
381 (vnode_vtype(vp) == VDIR ? FUSE_FSYNCDIR : FUSE_FSYNC))) {
382 return 0;
383 }
384 if (vnode_isdir(vp))
385 op = FUSE_FSYNCDIR;
386
387 if (fsess_not_impl(mp, op))
388 return 0;
389
390 fdisp_init(&fdi, sizeof(*ffsi));
391 /*
392 * fsync every open file handle for this file, because we can't be sure
393 * which file handle the caller is really referring to.
394 */
395 LIST_FOREACH(fufh, &fvdat->handles, next) {
396 fdi.iosize = sizeof(*ffsi);
397 if (ffsi == NULL)
398 fdisp_make_vp(&fdi, op, vp, td, NULL);
399 else
400 fdisp_refresh_vp(&fdi, op, vp, td, NULL);
401 ffsi = fdi.indata;
402 ffsi->fh = fufh->fh_id;
403 ffsi->fsync_flags = 0;
404
405 if (datasync)
406 ffsi->fsync_flags = FUSE_FSYNC_FDATASYNC;
407
408 if (waitfor == MNT_WAIT) {
409 err = fdisp_wait_answ(&fdi);
410 } else {
411 fuse_insert_callback(fdi.tick,
412 fuse_internal_fsync_callback);
413 fuse_insert_message(fdi.tick, false);
414 }
415 if (err == ENOSYS) {
416 /* ENOSYS means "success, and don't call again" */
417 fsess_set_notimpl(mp, op);
418 err = 0;
419 break;
420 }
421 }
422 fdisp_destroy(&fdi);
423
424 return err;
425 }
426
427 /* Asynchronous invalidation */
428 SDT_PROBE_DEFINE3(fusefs, , internal, invalidate_entry,
429 "struct vnode*", "struct fuse_notify_inval_entry_out*", "char*");
430 int
fuse_internal_invalidate_entry(struct mount * mp,struct uio * uio)431 fuse_internal_invalidate_entry(struct mount *mp, struct uio *uio)
432 {
433 struct fuse_notify_inval_entry_out fnieo;
434 struct componentname cn;
435 struct vnode *dvp, *vp;
436 char name[PATH_MAX];
437 int err;
438
439 if ((err = uiomove(&fnieo, sizeof(fnieo), uio)) != 0)
440 return (err);
441
442 if (fnieo.namelen >= sizeof(name))
443 return (EINVAL);
444
445 if ((err = uiomove(name, fnieo.namelen, uio)) != 0)
446 return (err);
447 name[fnieo.namelen] = '\0';
448 /* fusefs does not cache "." or ".." entries */
449 if (strncmp(name, ".", sizeof(".")) == 0 ||
450 strncmp(name, "..", sizeof("..")) == 0)
451 return (0);
452
453 if (fnieo.parent == FUSE_ROOT_ID)
454 err = VFS_ROOT(mp, LK_SHARED, &dvp);
455 else
456 err = fuse_internal_get_cached_vnode( mp, fnieo.parent,
457 LK_SHARED, &dvp);
458 SDT_PROBE3(fusefs, , internal, invalidate_entry, dvp, &fnieo, name);
459 /*
460 * If dvp is not in the cache, then it must've been reclaimed. And
461 * since fuse_vnop_reclaim does a cache_purge, name's entry must've
462 * been invalidated already. So we can safely return if dvp == NULL
463 */
464 if (err != 0 || dvp == NULL)
465 return (err);
466 /*
467 * XXX we can't check dvp's generation because the FUSE invalidate
468 * entry message doesn't include it. Worse case is that we invalidate
469 * an entry that didn't need to be invalidated.
470 */
471
472 cn.cn_nameiop = LOOKUP;
473 cn.cn_flags = 0; /* !MAKEENTRY means free cached entry */
474 cn.cn_cred = curthread->td_ucred;
475 cn.cn_lkflags = LK_SHARED;
476 cn.cn_pnbuf = NULL;
477 cn.cn_nameptr = name;
478 cn.cn_namelen = fnieo.namelen;
479 err = cache_lookup(dvp, &vp, &cn, NULL, NULL);
480 MPASS(err == 0);
481 fuse_vnode_clear_attr_cache(dvp);
482 vput(dvp);
483 return (0);
484 }
485
486 SDT_PROBE_DEFINE2(fusefs, , internal, invalidate_inode,
487 "struct vnode*", "struct fuse_notify_inval_inode_out *");
488 int
fuse_internal_invalidate_inode(struct mount * mp,struct uio * uio)489 fuse_internal_invalidate_inode(struct mount *mp, struct uio *uio)
490 {
491 struct fuse_notify_inval_inode_out fniio;
492 struct vnode *vp;
493 int err;
494
495 if ((err = uiomove(&fniio, sizeof(fniio), uio)) != 0)
496 return (err);
497
498 if (fniio.ino == FUSE_ROOT_ID)
499 err = VFS_ROOT(mp, LK_EXCLUSIVE, &vp);
500 else
501 err = fuse_internal_get_cached_vnode(mp, fniio.ino, LK_SHARED,
502 &vp);
503 SDT_PROBE2(fusefs, , internal, invalidate_inode, vp, &fniio);
504 if (err != 0 || vp == NULL)
505 return (err);
506 /*
507 * XXX we can't check vp's generation because the FUSE invalidate
508 * entry message doesn't include it. Worse case is that we invalidate
509 * an inode that didn't need to be invalidated.
510 */
511
512 /*
513 * Flush and invalidate buffers if off >= 0. Technically we only need
514 * to flush and invalidate the range of offsets [off, off + len), but
515 * for simplicity's sake we do everything.
516 */
517 if (fniio.off >= 0)
518 fuse_io_invalbuf(vp, curthread);
519 fuse_vnode_clear_attr_cache(vp);
520 vput(vp);
521 return (0);
522 }
523
524 /* mknod */
525 int
fuse_internal_mknod(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,struct vattr * vap)526 fuse_internal_mknod(struct vnode *dvp, struct vnode **vpp,
527 struct componentname *cnp, struct vattr *vap)
528 {
529 struct fuse_data *data;
530 struct fuse_mknod_in fmni;
531 size_t insize;
532
533 data = fuse_get_mpdata(dvp->v_mount);
534
535 fmni.mode = MAKEIMODE(vap->va_type, vap->va_mode);
536 fmni.rdev = vap->va_rdev;
537 if (fuse_libabi_geq(data, 7, 12)) {
538 insize = sizeof(fmni);
539 fmni.umask = curthread->td_proc->p_pd->pd_cmask;
540 fmni.padding = 0;
541 } else {
542 insize = FUSE_COMPAT_MKNOD_IN_SIZE;
543 }
544 return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKNOD, &fmni,
545 insize, vap->va_type));
546 }
547
548 /* readdir */
549
550 int
fuse_internal_readdir(struct vnode * vp,struct uio * uio,struct fuse_filehandle * fufh,struct fuse_iov * cookediov,int * ncookies,uint64_t * cookies)551 fuse_internal_readdir(struct vnode *vp,
552 struct uio *uio,
553 struct fuse_filehandle *fufh,
554 struct fuse_iov *cookediov,
555 int *ncookies,
556 uint64_t *cookies)
557 {
558 int err = 0;
559 struct fuse_dispatcher fdi;
560 struct fuse_read_in *fri = NULL;
561
562 if (uio_resid(uio) == 0)
563 return 0;
564 fdisp_init(&fdi, 0);
565
566 /*
567 * Note that we DO NOT have a UIO_SYSSPACE here (so no need for p2p
568 * I/O).
569 */
570 while (uio_resid(uio) > 0) {
571 fdi.iosize = sizeof(*fri);
572 fdisp_make_vp(&fdi, FUSE_READDIR, vp, NULL, NULL);
573 fri = fdi.indata;
574 fri->fh = fufh->fh_id;
575 fri->offset = uio_offset(uio);
576 fri->size = MIN(uio->uio_resid,
577 fuse_get_mpdata(vp->v_mount)->max_read);
578
579 if ((err = fdisp_wait_answ(&fdi)))
580 break;
581 if ((err = fuse_internal_readdir_processdata(uio, fri->size,
582 fdi.answ, fdi.iosize, cookediov, ncookies, &cookies)))
583 break;
584 }
585
586 fdisp_destroy(&fdi);
587 return ((err == -1) ? 0 : err);
588 }
589
590 /*
591 * Return -1 to indicate that this readdir is finished, 0 if it copied
592 * all the directory data read in and it may be possible to read more
593 * and greater than 0 for a failure.
594 */
595 int
fuse_internal_readdir_processdata(struct uio * uio,size_t reqsize,void * buf,size_t bufsize,struct fuse_iov * cookediov,int * ncookies,uint64_t ** cookiesp)596 fuse_internal_readdir_processdata(struct uio *uio,
597 size_t reqsize,
598 void *buf,
599 size_t bufsize,
600 struct fuse_iov *cookediov,
601 int *ncookies,
602 uint64_t **cookiesp)
603 {
604 int err = 0;
605 int oreclen;
606 size_t freclen;
607
608 struct dirent *de;
609 struct fuse_dirent *fudge;
610 uint64_t *cookies;
611
612 cookies = *cookiesp;
613 if (bufsize < FUSE_NAME_OFFSET)
614 return -1;
615 for (;;) {
616 if (bufsize < FUSE_NAME_OFFSET) {
617 err = -1;
618 break;
619 }
620 fudge = (struct fuse_dirent *)buf;
621 freclen = FUSE_DIRENT_SIZE(fudge);
622
623 if (bufsize < freclen) {
624 /*
625 * This indicates a partial directory entry at the
626 * end of the directory data.
627 */
628 err = -1;
629 break;
630 }
631 #ifdef ZERO_PAD_INCOMPLETE_BUFS
632 if (isbzero(buf, FUSE_NAME_OFFSET)) {
633 err = -1;
634 break;
635 }
636 #endif
637
638 if (!fudge->namelen || fudge->namelen > MAXNAMLEN) {
639 err = EINVAL;
640 break;
641 }
642 oreclen = GENERIC_DIRSIZ((struct pseudo_dirent *)
643 &fudge->namelen);
644
645 if (oreclen > uio_resid(uio)) {
646 /* Out of space for the dir so we are done. */
647 err = -1;
648 break;
649 }
650 fiov_adjust(cookediov, oreclen);
651 bzero(cookediov->base, oreclen);
652
653 de = (struct dirent *)cookediov->base;
654 de->d_fileno = fudge->ino;
655 de->d_off = fudge->off;
656 de->d_reclen = oreclen;
657 de->d_type = fudge->type;
658 de->d_namlen = fudge->namelen;
659 memcpy((char *)cookediov->base + sizeof(struct dirent) -
660 MAXNAMLEN - 1,
661 (char *)buf + FUSE_NAME_OFFSET, fudge->namelen);
662 dirent_terminate(de);
663
664 err = uiomove(cookediov->base, cookediov->len, uio);
665 if (err)
666 break;
667 if (cookies != NULL) {
668 if (*ncookies == 0) {
669 err = -1;
670 break;
671 }
672 *cookies = fudge->off;
673 cookies++;
674 (*ncookies)--;
675 }
676 buf = (char *)buf + freclen;
677 bufsize -= freclen;
678 uio_setoffset(uio, fudge->off);
679 }
680 *cookiesp = cookies;
681
682 return err;
683 }
684
685 /* remove */
686
687 int
fuse_internal_remove(struct vnode * dvp,struct vnode * vp,struct componentname * cnp,enum fuse_opcode op)688 fuse_internal_remove(struct vnode *dvp,
689 struct vnode *vp,
690 struct componentname *cnp,
691 enum fuse_opcode op)
692 {
693 struct fuse_dispatcher fdi;
694 nlink_t nlink;
695 int err = 0;
696
697 fdisp_init(&fdi, cnp->cn_namelen + 1);
698 fdisp_make_vp(&fdi, op, dvp, curthread, cnp->cn_cred);
699
700 memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
701 ((char *)fdi.indata)[cnp->cn_namelen] = '\0';
702
703 err = fdisp_wait_answ(&fdi);
704 fdisp_destroy(&fdi);
705
706 if (err)
707 return (err);
708
709 /*
710 * Access the cached nlink even if the attr cached has expired. If
711 * it's inaccurate, the worst that will happen is:
712 * 1) We'll recycle the vnode even though the file has another link we
713 * don't know about, costing a bit of cpu time, or
714 * 2) We won't recycle the vnode even though all of its links are gone.
715 * It will linger around until vnlru reclaims it, costing a bit of
716 * temporary memory.
717 */
718 nlink = VTOFUD(vp)->cached_attrs.va_nlink--;
719
720 /*
721 * Purge the parent's attribute cache because the daemon
722 * should've updated its mtime and ctime.
723 */
724 fuse_vnode_clear_attr_cache(dvp);
725
726 /* NB: nlink could be zero if it was never cached */
727 if (nlink <= 1 || vnode_vtype(vp) == VDIR) {
728 fuse_internal_vnode_disappear(vp);
729 } else {
730 cache_purge(vp);
731 fuse_vnode_update(vp, FN_CTIMECHANGE);
732 }
733
734 return err;
735 }
736
737 /* rename */
738
739 int
fuse_internal_rename(struct vnode * fdvp,struct componentname * fcnp,struct vnode * tdvp,struct componentname * tcnp)740 fuse_internal_rename(struct vnode *fdvp,
741 struct componentname *fcnp,
742 struct vnode *tdvp,
743 struct componentname *tcnp)
744 {
745 struct fuse_dispatcher fdi;
746 struct fuse_rename_in *fri;
747 int err = 0;
748
749 fdisp_init(&fdi, sizeof(*fri) + fcnp->cn_namelen + tcnp->cn_namelen + 2);
750 fdisp_make_vp(&fdi, FUSE_RENAME, fdvp, curthread, tcnp->cn_cred);
751
752 fri = fdi.indata;
753 fri->newdir = VTOI(tdvp);
754 memcpy((char *)fdi.indata + sizeof(*fri), fcnp->cn_nameptr,
755 fcnp->cn_namelen);
756 ((char *)fdi.indata)[sizeof(*fri) + fcnp->cn_namelen] = '\0';
757 memcpy((char *)fdi.indata + sizeof(*fri) + fcnp->cn_namelen + 1,
758 tcnp->cn_nameptr, tcnp->cn_namelen);
759 ((char *)fdi.indata)[sizeof(*fri) + fcnp->cn_namelen +
760 tcnp->cn_namelen + 1] = '\0';
761
762 err = fdisp_wait_answ(&fdi);
763 fdisp_destroy(&fdi);
764 return err;
765 }
766
767 /* strategy */
768
769 /* entity creation */
770
771 void
fuse_internal_newentry_makerequest(struct mount * mp,uint64_t dnid,struct componentname * cnp,enum fuse_opcode op,void * buf,size_t bufsize,struct fuse_dispatcher * fdip)772 fuse_internal_newentry_makerequest(struct mount *mp,
773 uint64_t dnid,
774 struct componentname *cnp,
775 enum fuse_opcode op,
776 void *buf,
777 size_t bufsize,
778 struct fuse_dispatcher *fdip)
779 {
780 fdip->iosize = bufsize + cnp->cn_namelen + 1;
781
782 fdisp_make(fdip, op, mp, dnid, curthread, cnp->cn_cred);
783 memcpy(fdip->indata, buf, bufsize);
784 memcpy((char *)fdip->indata + bufsize, cnp->cn_nameptr, cnp->cn_namelen);
785 ((char *)fdip->indata)[bufsize + cnp->cn_namelen] = '\0';
786 }
787
788 int
fuse_internal_newentry_core(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,__enum_uint8 (vtype)vtyp,struct fuse_dispatcher * fdip)789 fuse_internal_newentry_core(struct vnode *dvp,
790 struct vnode **vpp,
791 struct componentname *cnp,
792 __enum_uint8(vtype) vtyp,
793 struct fuse_dispatcher *fdip)
794 {
795 int err = 0;
796 struct fuse_entry_out *feo;
797 struct mount *mp = vnode_mount(dvp);
798
799 if ((err = fdisp_wait_answ(fdip))) {
800 return err;
801 }
802 feo = fdip->answ;
803
804 if ((err = fuse_internal_checkentry(feo, vtyp))) {
805 return err;
806 }
807 err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vtyp);
808 if (err) {
809 fuse_internal_forget_send(mp, curthread, cnp->cn_cred,
810 feo->nodeid, 1);
811 return err;
812 }
813
814 /*
815 * Purge the parent's attribute cache because the daemon should've
816 * updated its mtime and ctime
817 */
818 fuse_vnode_clear_attr_cache(dvp);
819
820 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
821 feo->attr_valid_nsec, NULL, true);
822
823 return err;
824 }
825
826 int
fuse_internal_newentry(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,enum fuse_opcode op,void * buf,size_t bufsize,__enum_uint8 (vtype)vtype)827 fuse_internal_newentry(struct vnode *dvp,
828 struct vnode **vpp,
829 struct componentname *cnp,
830 enum fuse_opcode op,
831 void *buf,
832 size_t bufsize,
833 __enum_uint8(vtype) vtype)
834 {
835 int err;
836 struct fuse_dispatcher fdi;
837 struct mount *mp = vnode_mount(dvp);
838
839 fdisp_init(&fdi, 0);
840 fuse_internal_newentry_makerequest(mp, VTOI(dvp), cnp, op, buf,
841 bufsize, &fdi);
842 err = fuse_internal_newentry_core(dvp, vpp, cnp, vtype, &fdi);
843 fdisp_destroy(&fdi);
844
845 return err;
846 }
847
848 /* entity destruction */
849
850 int
fuse_internal_forget_callback(struct fuse_ticket * ftick,struct uio * uio)851 fuse_internal_forget_callback(struct fuse_ticket *ftick, struct uio *uio)
852 {
853 fuse_internal_forget_send(ftick->tk_data->mp, curthread, NULL,
854 ((struct fuse_in_header *)ftick->tk_ms_fiov.base)->nodeid, 1);
855
856 return 0;
857 }
858
859 void
fuse_internal_forget_send(struct mount * mp,struct thread * td,struct ucred * cred,uint64_t nodeid,uint64_t nlookup)860 fuse_internal_forget_send(struct mount *mp,
861 struct thread *td,
862 struct ucred *cred,
863 uint64_t nodeid,
864 uint64_t nlookup)
865 {
866
867 struct fuse_dispatcher fdi;
868 struct fuse_forget_in *ffi;
869
870 /*
871 * KASSERT(nlookup > 0, ("zero-times forget for vp #%llu",
872 * (long long unsigned) nodeid));
873 */
874
875 fdisp_init(&fdi, sizeof(*ffi));
876 fdisp_make(&fdi, FUSE_FORGET, mp, nodeid, td, cred);
877
878 ffi = fdi.indata;
879 ffi->nlookup = nlookup;
880
881 fuse_insert_message(fdi.tick, false);
882 fdisp_destroy(&fdi);
883 }
884
885 /* Fetch the vnode's attributes from the daemon*/
886 int
fuse_internal_do_getattr(struct vnode * vp,struct vattr * vap,struct ucred * cred,struct thread * td)887 fuse_internal_do_getattr(struct vnode *vp, struct vattr *vap,
888 struct ucred *cred, struct thread *td)
889 {
890 struct fuse_dispatcher fdi;
891 struct fuse_vnode_data *fvdat = VTOFUD(vp);
892 struct fuse_getattr_in *fgai;
893 struct fuse_attr_out *fao;
894 off_t old_filesize = fvdat->cached_attrs.va_size;
895 struct timespec old_atime = fvdat->cached_attrs.va_atime;
896 struct timespec old_ctime = fvdat->cached_attrs.va_ctime;
897 struct timespec old_mtime = fvdat->cached_attrs.va_mtime;
898 __enum_uint8(vtype) vtyp;
899 int err;
900
901 ASSERT_VOP_LOCKED(vp, __func__);
902
903 fdisp_init(&fdi, sizeof(*fgai));
904 fdisp_make_vp(&fdi, FUSE_GETATTR, vp, td, cred);
905 fgai = fdi.indata;
906 /*
907 * We could look up a file handle and set it in fgai->fh, but that
908 * involves extra runtime work and I'm unaware of any file systems that
909 * care.
910 */
911 fgai->getattr_flags = 0;
912 if ((err = fdisp_wait_answ(&fdi))) {
913 if (err == ENOENT)
914 fuse_internal_vnode_disappear(vp);
915 goto out;
916 }
917
918 fao = (struct fuse_attr_out *)fdi.answ;
919 vtyp = IFTOVT(fao->attr.mode);
920 if (fvdat->flag & FN_SIZECHANGE)
921 fao->attr.size = old_filesize;
922 if (fvdat->flag & FN_ATIMECHANGE) {
923 fao->attr.atime = old_atime.tv_sec;
924 fao->attr.atimensec = old_atime.tv_nsec;
925 }
926 if (fvdat->flag & FN_CTIMECHANGE) {
927 fao->attr.ctime = old_ctime.tv_sec;
928 fao->attr.ctimensec = old_ctime.tv_nsec;
929 }
930 if (fvdat->flag & FN_MTIMECHANGE) {
931 fao->attr.mtime = old_mtime.tv_sec;
932 fao->attr.mtimensec = old_mtime.tv_nsec;
933 }
934 fuse_internal_cache_attrs(vp, &fao->attr, fao->attr_valid,
935 fao->attr_valid_nsec, vap, true);
936 if (vtyp != vnode_vtype(vp)) {
937 fuse_internal_vnode_disappear(vp);
938 err = ENOENT;
939 }
940
941 out:
942 fdisp_destroy(&fdi);
943 return err;
944 }
945
946 /* Read a vnode's attributes from cache or fetch them from the fuse daemon */
947 int
fuse_internal_getattr(struct vnode * vp,struct vattr * vap,struct ucred * cred,struct thread * td)948 fuse_internal_getattr(struct vnode *vp, struct vattr *vap, struct ucred *cred,
949 struct thread *td)
950 {
951 struct vattr *attrs;
952
953 if ((attrs = VTOVA(vp)) != NULL) {
954 *vap = *attrs; /* struct copy */
955 return 0;
956 }
957
958 return fuse_internal_do_getattr(vp, vap, cred, td);
959 }
960
961 void
fuse_internal_vnode_disappear(struct vnode * vp)962 fuse_internal_vnode_disappear(struct vnode *vp)
963 {
964 struct fuse_vnode_data *fvdat = VTOFUD(vp);
965
966 ASSERT_VOP_ELOCKED(vp, "fuse_internal_vnode_disappear");
967 fvdat->flag |= FN_REVOKED;
968 cache_purge(vp);
969 }
970
971 /* fuse start/stop */
972
973 SDT_PROBE_DEFINE2(fusefs, , internal, init_done,
974 "struct fuse_data*", "struct fuse_init_out*");
975 int
fuse_internal_init_callback(struct fuse_ticket * tick,struct uio * uio)976 fuse_internal_init_callback(struct fuse_ticket *tick, struct uio *uio)
977 {
978 int err = 0;
979 struct fuse_data *data = tick->tk_data;
980 struct fuse_init_out *fiio = NULL;
981
982 if ((err = tick->tk_aw_ohead.error)) {
983 goto out;
984 }
985 if ((err = fticket_pull(tick, uio))) {
986 goto out;
987 }
988 fiio = fticket_resp(tick)->base;
989
990 data->fuse_libabi_major = fiio->major;
991 data->fuse_libabi_minor = fiio->minor;
992 if (!fuse_libabi_geq(data, 7, 4)) {
993 /*
994 * With a little work we could support servers as old as 7.1.
995 * But there would be little payoff.
996 */
997 SDT_PROBE2(fusefs, , internal, trace, 1,
998 "userspace version too low");
999 err = EPROTONOSUPPORT;
1000 goto out;
1001 }
1002
1003 if (fuse_libabi_geq(data, 7, 5)) {
1004 if (fticket_resp(tick)->len == sizeof(struct fuse_init_out) ||
1005 fticket_resp(tick)->len == FUSE_COMPAT_22_INIT_OUT_SIZE) {
1006 data->max_write = fiio->max_write;
1007 if (fiio->flags & FUSE_ASYNC_READ)
1008 data->dataflags |= FSESS_ASYNC_READ;
1009 if (fiio->flags & FUSE_POSIX_LOCKS)
1010 data->dataflags |= FSESS_POSIX_LOCKS;
1011 if (fiio->flags & FUSE_EXPORT_SUPPORT)
1012 data->dataflags |= FSESS_EXPORT_SUPPORT;
1013 if (fiio->flags & FUSE_NO_OPEN_SUPPORT)
1014 data->dataflags |= FSESS_NO_OPEN_SUPPORT;
1015 if (fiio->flags & FUSE_NO_OPENDIR_SUPPORT)
1016 data->dataflags |= FSESS_NO_OPENDIR_SUPPORT;
1017 /*
1018 * Don't bother to check FUSE_BIG_WRITES, because it's
1019 * redundant with max_write
1020 */
1021 /*
1022 * max_background and congestion_threshold are not
1023 * implemented
1024 */
1025 } else {
1026 err = EINVAL;
1027 }
1028 } else {
1029 /* Old fixed values */
1030 data->max_write = 4096;
1031 }
1032
1033 if (fuse_libabi_geq(data, 7, 6))
1034 data->max_readahead_blocks = fiio->max_readahead / maxbcachebuf;
1035
1036 if (!fuse_libabi_geq(data, 7, 7))
1037 fsess_set_notimpl(data->mp, FUSE_INTERRUPT);
1038
1039 if (!fuse_libabi_geq(data, 7, 8)) {
1040 fsess_set_notimpl(data->mp, FUSE_BMAP);
1041 fsess_set_notimpl(data->mp, FUSE_DESTROY);
1042 }
1043
1044 if (!fuse_libabi_geq(data, 7, 19)) {
1045 fsess_set_notimpl(data->mp, FUSE_FALLOCATE);
1046 }
1047
1048 if (fuse_libabi_geq(data, 7, 23) && fiio->time_gran >= 1 &&
1049 fiio->time_gran <= 1000000000)
1050 data->time_gran = fiio->time_gran;
1051 else
1052 data->time_gran = 1;
1053
1054 if (!fuse_libabi_geq(data, 7, 23))
1055 data->cache_mode = fuse_data_cache_mode;
1056 else if (fiio->flags & FUSE_WRITEBACK_CACHE)
1057 data->cache_mode = FUSE_CACHE_WB;
1058 else
1059 data->cache_mode = FUSE_CACHE_WT;
1060
1061 if (!fuse_libabi_geq(data, 7, 24))
1062 fsess_set_notimpl(data->mp, FUSE_LSEEK);
1063
1064 if (!fuse_libabi_geq(data, 7, 28))
1065 fsess_set_notimpl(data->mp, FUSE_COPY_FILE_RANGE);
1066
1067 out:
1068 if (err) {
1069 fdata_set_dead(data);
1070 }
1071 FUSE_LOCK();
1072 data->dataflags |= FSESS_INITED;
1073 SDT_PROBE2(fusefs, , internal, init_done, data, fiio);
1074 wakeup(&data->ticketer);
1075 FUSE_UNLOCK();
1076
1077 return 0;
1078 }
1079
1080 void
fuse_internal_send_init(struct fuse_data * data,struct thread * td)1081 fuse_internal_send_init(struct fuse_data *data, struct thread *td)
1082 {
1083 struct fuse_init_in *fiii;
1084 struct fuse_dispatcher fdi;
1085
1086 fdisp_init(&fdi, sizeof(*fiii));
1087 fdisp_make(&fdi, FUSE_INIT, data->mp, 0, td, NULL);
1088 fiii = fdi.indata;
1089 fiii->major = FUSE_KERNEL_VERSION;
1090 fiii->minor = FUSE_KERNEL_MINOR_VERSION;
1091 /*
1092 * fusefs currently reads ahead no more than one cache block at a time.
1093 * See fuse_read_biobackend
1094 */
1095 fiii->max_readahead = maxbcachebuf;
1096 /*
1097 * Unsupported features:
1098 * FUSE_FILE_OPS: No known FUSE server or client supports it
1099 * FUSE_ATOMIC_O_TRUNC: our VFS cannot support it
1100 * FUSE_DONT_MASK: unlike Linux, FreeBSD always applies the umask, even
1101 * when default ACLs are in use.
1102 * FUSE_SPLICE_WRITE, FUSE_SPLICE_MOVE, FUSE_SPLICE_READ: FreeBSD
1103 * doesn't have splice(2).
1104 * FUSE_FLOCK_LOCKS: not yet implemented
1105 * FUSE_HAS_IOCTL_DIR: not yet implemented
1106 * FUSE_AUTO_INVAL_DATA: not yet implemented
1107 * FUSE_DO_READDIRPLUS: not yet implemented
1108 * FUSE_READDIRPLUS_AUTO: not yet implemented
1109 * FUSE_ASYNC_DIO: not yet implemented
1110 * FUSE_PARALLEL_DIROPS: not yet implemented
1111 * FUSE_HANDLE_KILLPRIV: not yet implemented
1112 * FUSE_POSIX_ACL: not yet implemented
1113 * FUSE_ABORT_ERROR: not yet implemented
1114 * FUSE_CACHE_SYMLINKS: not yet implemented
1115 * FUSE_MAX_PAGES: not yet implemented
1116 */
1117 fiii->flags = FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_EXPORT_SUPPORT
1118 | FUSE_BIG_WRITES | FUSE_WRITEBACK_CACHE
1119 | FUSE_NO_OPEN_SUPPORT | FUSE_NO_OPENDIR_SUPPORT;
1120
1121 fuse_insert_callback(fdi.tick, fuse_internal_init_callback);
1122 fuse_insert_message(fdi.tick, false);
1123 fdisp_destroy(&fdi);
1124 }
1125
1126 /*
1127 * Send a FUSE_SETATTR operation with no permissions checks. If cred is NULL,
1128 * send the request with root credentials
1129 */
fuse_internal_setattr(struct vnode * vp,struct vattr * vap,struct thread * td,struct ucred * cred)1130 int fuse_internal_setattr(struct vnode *vp, struct vattr *vap,
1131 struct thread *td, struct ucred *cred)
1132 {
1133 struct fuse_vnode_data *fvdat;
1134 struct fuse_dispatcher fdi;
1135 struct fuse_setattr_in *fsai;
1136 struct mount *mp;
1137 pid_t pid = td->td_proc->p_pid;
1138 struct fuse_data *data;
1139 int err = 0;
1140 __enum_uint8(vtype) vtyp;
1141
1142 ASSERT_VOP_ELOCKED(vp, __func__);
1143
1144 mp = vnode_mount(vp);
1145 fvdat = VTOFUD(vp);
1146 data = fuse_get_mpdata(mp);
1147
1148 fdisp_init(&fdi, sizeof(*fsai));
1149 fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
1150 if (!cred) {
1151 fdi.finh->uid = 0;
1152 fdi.finh->gid = 0;
1153 }
1154 fsai = fdi.indata;
1155 fsai->valid = 0;
1156
1157 if (vap->va_uid != (uid_t)VNOVAL) {
1158 fsai->uid = vap->va_uid;
1159 fsai->valid |= FATTR_UID;
1160 }
1161 if (vap->va_gid != (gid_t)VNOVAL) {
1162 fsai->gid = vap->va_gid;
1163 fsai->valid |= FATTR_GID;
1164 }
1165 if (vap->va_size != VNOVAL) {
1166 struct fuse_filehandle *fufh = NULL;
1167
1168 /*Truncate to a new value. */
1169 fsai->size = vap->va_size;
1170 fsai->valid |= FATTR_SIZE;
1171
1172 fuse_filehandle_getrw(vp, FWRITE, &fufh, cred, pid);
1173 if (fufh) {
1174 fsai->fh = fufh->fh_id;
1175 fsai->valid |= FATTR_FH;
1176 }
1177 VTOFUD(vp)->flag &= ~FN_SIZECHANGE;
1178 }
1179 if (vap->va_atime.tv_sec != VNOVAL) {
1180 fsai->atime = vap->va_atime.tv_sec;
1181 fsai->atimensec = vap->va_atime.tv_nsec;
1182 fsai->valid |= FATTR_ATIME;
1183 if (vap->va_vaflags & VA_UTIMES_NULL)
1184 fsai->valid |= FATTR_ATIME_NOW;
1185 } else if (fvdat->flag & FN_ATIMECHANGE) {
1186 fsai->atime = fvdat->cached_attrs.va_atime.tv_sec;
1187 fsai->atimensec = fvdat->cached_attrs.va_atime.tv_nsec;
1188 fsai->valid |= FATTR_ATIME;
1189 }
1190 if (vap->va_mtime.tv_sec != VNOVAL) {
1191 fsai->mtime = vap->va_mtime.tv_sec;
1192 fsai->mtimensec = vap->va_mtime.tv_nsec;
1193 fsai->valid |= FATTR_MTIME;
1194 if (vap->va_vaflags & VA_UTIMES_NULL)
1195 fsai->valid |= FATTR_MTIME_NOW;
1196 } else if (fvdat->flag & FN_MTIMECHANGE) {
1197 fsai->mtime = fvdat->cached_attrs.va_mtime.tv_sec;
1198 fsai->mtimensec = fvdat->cached_attrs.va_mtime.tv_nsec;
1199 fsai->valid |= FATTR_MTIME;
1200 }
1201 if (fuse_libabi_geq(data, 7, 23) && fvdat->flag & FN_CTIMECHANGE) {
1202 fsai->ctime = fvdat->cached_attrs.va_ctime.tv_sec;
1203 fsai->ctimensec = fvdat->cached_attrs.va_ctime.tv_nsec;
1204 fsai->valid |= FATTR_CTIME;
1205 }
1206 if (vap->va_mode != (mode_t)VNOVAL) {
1207 fsai->mode = vap->va_mode & ALLPERMS;
1208 fsai->valid |= FATTR_MODE;
1209 }
1210 if (!fsai->valid) {
1211 goto out;
1212 }
1213
1214 if ((err = fdisp_wait_answ(&fdi)))
1215 goto out;
1216 vtyp = IFTOVT(((struct fuse_attr_out *)fdi.answ)->attr.mode);
1217
1218 if (vnode_vtype(vp) != vtyp) {
1219 if (vnode_vtype(vp) == VNON && vtyp != VNON) {
1220 SDT_PROBE2(fusefs, , internal, trace, 1, "FUSE: Dang! "
1221 "vnode_vtype is VNON and vtype isn't.");
1222 } else {
1223 /*
1224 * STALE vnode, ditch
1225 *
1226 * The vnode has changed its type "behind our back".
1227 * This probably means that the file got deleted and
1228 * recreated on the server, with the same inode.
1229 * There's nothing really we can do, so let us just
1230 * return ENOENT. After all, the entry must not have
1231 * existed in the recent past. If the user tries
1232 * again, it will work.
1233 */
1234 fuse_internal_vnode_disappear(vp);
1235 err = ENOENT;
1236 }
1237 }
1238 if (err == 0) {
1239 struct fuse_attr_out *fao = (struct fuse_attr_out*)fdi.answ;
1240 fuse_vnode_undirty_cached_timestamps(vp, true);
1241 fuse_internal_cache_attrs(vp, &fao->attr, fao->attr_valid,
1242 fao->attr_valid_nsec, NULL, false);
1243 getnanouptime(&fvdat->last_local_modify);
1244 }
1245
1246 out:
1247 fdisp_destroy(&fdi);
1248 return err;
1249 }
1250
1251 /*
1252 * FreeBSD clears the SUID and SGID bits on any write by a non-root user.
1253 */
1254 void
fuse_internal_clear_suid_on_write(struct vnode * vp,struct ucred * cred,struct thread * td)1255 fuse_internal_clear_suid_on_write(struct vnode *vp, struct ucred *cred,
1256 struct thread *td)
1257 {
1258 struct fuse_data *data;
1259 struct mount *mp;
1260 struct vattr va;
1261 int dataflags;
1262
1263 mp = vnode_mount(vp);
1264 data = fuse_get_mpdata(mp);
1265 dataflags = data->dataflags;
1266
1267 ASSERT_VOP_LOCKED(vp, __func__);
1268
1269 if (dataflags & FSESS_DEFAULT_PERMISSIONS) {
1270 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID)) {
1271 fuse_internal_getattr(vp, &va, cred, td);
1272 if (va.va_mode & (S_ISUID | S_ISGID)) {
1273 mode_t mode = va.va_mode & ~(S_ISUID | S_ISGID);
1274 /* Clear all vattr fields except mode */
1275 vattr_null(&va);
1276 va.va_mode = mode;
1277
1278 /*
1279 * Ignore fuse_internal_setattr's return value,
1280 * because at this point the write operation has
1281 * already succeeded and we don't want to return
1282 * failing status for that.
1283 */
1284 (void)fuse_internal_setattr(vp, &va, td, NULL);
1285 }
1286 }
1287 }
1288 }
1289
1290 #ifdef ZERO_PAD_INCOMPLETE_BUFS
1291 static int
isbzero(void * buf,size_t len)1292 isbzero(void *buf, size_t len)
1293 {
1294 int i;
1295
1296 for (i = 0; i < len; i++) {
1297 if (((char *)buf)[i])
1298 return (0);
1299 }
1300
1301 return (1);
1302 }
1303
1304 #endif
1305
1306 void
fuse_internal_init(void)1307 fuse_internal_init(void)
1308 {
1309 fuse_lookup_cache_misses = counter_u64_alloc(M_WAITOK);
1310 fuse_lookup_cache_hits = counter_u64_alloc(M_WAITOK);
1311 }
1312
1313 void
fuse_internal_destroy(void)1314 fuse_internal_destroy(void)
1315 {
1316 counter_u64_free(fuse_lookup_cache_hits);
1317 counter_u64_free(fuse_lookup_cache_misses);
1318 }
1319