1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed
8 * to Berkeley by John Heidemann of the UCLA Ficus project.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/bio.h>
38 #include <sys/buf.h>
39 #include <sys/conf.h>
40 #include <sys/event.h>
41 #include <sys/filio.h>
42 #include <sys/kernel.h>
43 #include <sys/limits.h>
44 #include <sys/lock.h>
45 #include <sys/lockf.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/namei.h>
49 #include <sys/rwlock.h>
50 #include <sys/fcntl.h>
51 #include <sys/unistd.h>
52 #include <sys/vnode.h>
53 #include <sys/dirent.h>
54 #include <sys/poll.h>
55 #include <sys/stat.h>
56 #include <security/audit/audit.h>
57 #include <sys/priv.h>
58
59 #include <security/mac/mac_framework.h>
60
61 #include <vm/vm.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_extern.h>
64 #include <vm/pmap.h>
65 #include <vm/vm_map.h>
66 #include <vm/vm_page.h>
67 #include <vm/vm_pager.h>
68 #include <vm/vnode_pager.h>
69
70 static int vop_nolookup(struct vop_lookup_args *);
71 static int vop_norename(struct vop_rename_args *);
72 static int vop_nostrategy(struct vop_strategy_args *);
73 static int dirent_exists(struct vnode *vp, const char *dirname,
74 struct thread *td);
75
76 static int vop_stdis_text(struct vop_is_text_args *ap);
77 static int vop_stdunset_text(struct vop_unset_text_args *ap);
78 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap);
79 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap);
80 static int vop_stdfdatasync(struct vop_fdatasync_args *ap);
81 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap);
82 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap);
83 static int vop_stdstat(struct vop_stat_args *ap);
84 static int vop_stdvput_pair(struct vop_vput_pair_args *ap);
85 static int vop_stdgetlowvnode(struct vop_getlowvnode_args *ap);
86
87 /*
88 * This vnode table stores what we want to do if the filesystem doesn't
89 * implement a particular VOP.
90 *
91 * If there is no specific entry here, we will return EOPNOTSUPP.
92 *
93 * Note that every filesystem has to implement either vop_access
94 * or vop_accessx; failing to do so will result in immediate crash
95 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(),
96 * which calls vop_stdaccess() etc.
97 */
98
99 struct vop_vector default_vnodeops = {
100 .vop_default = NULL,
101 .vop_bypass = VOP_EOPNOTSUPP,
102
103 .vop_access = vop_stdaccess,
104 .vop_accessx = vop_stdaccessx,
105 .vop_advise = vop_stdadvise,
106 .vop_advlock = vop_stdadvlock,
107 .vop_advlockasync = vop_stdadvlockasync,
108 .vop_advlockpurge = vop_stdadvlockpurge,
109 .vop_allocate = vop_stdallocate,
110 .vop_deallocate = vop_stddeallocate,
111 .vop_bmap = vop_stdbmap,
112 .vop_close = VOP_NULL,
113 .vop_fsync = VOP_NULL,
114 .vop_stat = vop_stdstat,
115 .vop_fdatasync = vop_stdfdatasync,
116 .vop_getlowvnode = vop_stdgetlowvnode,
117 .vop_getpages = vop_stdgetpages,
118 .vop_getpages_async = vop_stdgetpages_async,
119 .vop_getwritemount = vop_stdgetwritemount,
120 .vop_inactive = VOP_NULL,
121 .vop_need_inactive = vop_stdneed_inactive,
122 .vop_ioctl = vop_stdioctl,
123 .vop_kqfilter = vop_stdkqfilter,
124 .vop_islocked = vop_stdislocked,
125 .vop_lock1 = vop_stdlock,
126 .vop_lookup = vop_nolookup,
127 .vop_open = VOP_NULL,
128 .vop_pathconf = VOP_EINVAL,
129 .vop_poll = vop_nopoll,
130 .vop_putpages = vop_stdputpages,
131 .vop_readlink = VOP_EINVAL,
132 .vop_read_pgcache = vop_stdread_pgcache,
133 .vop_rename = vop_norename,
134 .vop_revoke = VOP_PANIC,
135 .vop_strategy = vop_nostrategy,
136 .vop_unlock = vop_stdunlock,
137 .vop_vptocnp = vop_stdvptocnp,
138 .vop_vptofh = vop_stdvptofh,
139 .vop_unp_bind = vop_stdunp_bind,
140 .vop_unp_connect = vop_stdunp_connect,
141 .vop_unp_detach = vop_stdunp_detach,
142 .vop_is_text = vop_stdis_text,
143 .vop_set_text = vop_stdset_text,
144 .vop_unset_text = vop_stdunset_text,
145 .vop_add_writecount = vop_stdadd_writecount,
146 .vop_copy_file_range = vop_stdcopy_file_range,
147 .vop_vput_pair = vop_stdvput_pair,
148 };
149 VFS_VOP_VECTOR_REGISTER(default_vnodeops);
150
151 /*
152 * Series of placeholder functions for various error returns for
153 * VOPs.
154 */
155
156 int
vop_eopnotsupp(struct vop_generic_args * ap)157 vop_eopnotsupp(struct vop_generic_args *ap)
158 {
159 /*
160 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
161 */
162
163 return (EOPNOTSUPP);
164 }
165
166 int
vop_ebadf(struct vop_generic_args * ap)167 vop_ebadf(struct vop_generic_args *ap)
168 {
169
170 return (EBADF);
171 }
172
173 int
vop_enotty(struct vop_generic_args * ap)174 vop_enotty(struct vop_generic_args *ap)
175 {
176
177 return (ENOTTY);
178 }
179
180 int
vop_einval(struct vop_generic_args * ap)181 vop_einval(struct vop_generic_args *ap)
182 {
183
184 return (EINVAL);
185 }
186
187 int
vop_enoent(struct vop_generic_args * ap)188 vop_enoent(struct vop_generic_args *ap)
189 {
190
191 return (ENOENT);
192 }
193
194 int
vop_eagain(struct vop_generic_args * ap)195 vop_eagain(struct vop_generic_args *ap)
196 {
197
198 return (EAGAIN);
199 }
200
201 int
vop_null(struct vop_generic_args * ap)202 vop_null(struct vop_generic_args *ap)
203 {
204
205 return (0);
206 }
207
208 /*
209 * Helper function to panic on some bad VOPs in some filesystems.
210 */
211 int
vop_panic(struct vop_generic_args * ap)212 vop_panic(struct vop_generic_args *ap)
213 {
214
215 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
216 }
217
218 /*
219 * vop_std<something> and vop_no<something> are default functions for use by
220 * filesystems that need the "default reasonable" implementation for a
221 * particular operation.
222 *
223 * The documentation for the operations they implement exists (if it exists)
224 * in the VOP_<SOMETHING>(9) manpage (all uppercase).
225 */
226
227 /*
228 * Default vop for filesystems that do not support name lookup
229 */
230 static int
vop_nolookup(struct vop_lookup_args * ap)231 vop_nolookup(struct vop_lookup_args *ap)
232 {
233
234 *ap->a_vpp = NULL;
235 return (ENOTDIR);
236 }
237
238 /*
239 * vop_norename:
240 *
241 * Handle unlock and reference counting for arguments of vop_rename
242 * for filesystems that do not implement rename operation.
243 */
244 static int
vop_norename(struct vop_rename_args * ap)245 vop_norename(struct vop_rename_args *ap)
246 {
247
248 vop_rename_fail(ap);
249 return (EOPNOTSUPP);
250 }
251
252 /*
253 * vop_nostrategy:
254 *
255 * Strategy routine for VFS devices that have none.
256 *
257 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
258 * routine. Typically this is done for a BIO_READ strategy call.
259 * Typically B_INVAL is assumed to already be clear prior to a write
260 * and should not be cleared manually unless you just made the buffer
261 * invalid. BIO_ERROR should be cleared either way.
262 */
263
264 static int
vop_nostrategy(struct vop_strategy_args * ap)265 vop_nostrategy (struct vop_strategy_args *ap)
266 {
267 printf("No strategy for buffer at %p\n", ap->a_bp);
268 vn_printf(ap->a_vp, "vnode ");
269 ap->a_bp->b_ioflags |= BIO_ERROR;
270 ap->a_bp->b_error = EOPNOTSUPP;
271 bufdone(ap->a_bp);
272 return (EOPNOTSUPP);
273 }
274
275 /*
276 * Check if a named file exists in a given directory vnode
277 *
278 * Returns 0 if the file exists, ENOENT if it doesn't, or errors returned by
279 * vn_dir_next_dirent().
280 */
281 static int
dirent_exists(struct vnode * vp,const char * dirname,struct thread * td)282 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
283 {
284 char *dirbuf;
285 int error, eofflag;
286 size_t dirbuflen, len;
287 off_t off;
288 struct dirent *dp;
289 struct vattr va;
290
291 ASSERT_VOP_LOCKED(vp, "vnode not locked");
292 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
293
294 error = VOP_GETATTR(vp, &va, td->td_ucred);
295 if (error != 0)
296 return (error);
297
298 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ);
299 if (dirbuflen < va.va_blocksize)
300 dirbuflen = va.va_blocksize;
301 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK);
302
303 len = 0;
304 off = 0;
305 eofflag = 0;
306
307 for (;;) {
308 error = vn_dir_next_dirent(vp, td, dirbuf, dirbuflen,
309 &dp, &len, &off, &eofflag);
310 if (error != 0)
311 goto out;
312
313 if (len == 0)
314 break;
315
316 if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
317 strcmp(dp->d_name, dirname) == 0)
318 goto out;
319 }
320
321 error = ENOENT;
322
323 out:
324 free(dirbuf, M_TEMP);
325 return (error);
326 }
327
328 int
vop_stdaccess(struct vop_access_args * ap)329 vop_stdaccess(struct vop_access_args *ap)
330 {
331
332 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN |
333 VAPPEND)) == 0, ("invalid bit in accmode"));
334
335 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td));
336 }
337
338 int
vop_stdaccessx(struct vop_accessx_args * ap)339 vop_stdaccessx(struct vop_accessx_args *ap)
340 {
341 int error;
342 accmode_t accmode = ap->a_accmode;
343
344 error = vfs_unixify_accmode(&accmode);
345 if (error != 0)
346 return (error);
347
348 if (accmode == 0)
349 return (0);
350
351 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td));
352 }
353
354 /*
355 * Advisory record locking support
356 */
357 int
vop_stdadvlock(struct vop_advlock_args * ap)358 vop_stdadvlock(struct vop_advlock_args *ap)
359 {
360 struct vnode *vp;
361 struct mount *mp;
362 struct vattr vattr;
363 int error;
364
365 vp = ap->a_vp;
366
367 /*
368 * Provide atomicity of open(O_CREAT | O_EXCL | O_EXLOCK) for
369 * local filesystems. See vn_open_cred() for reciprocal part.
370 */
371 mp = vp->v_mount;
372 if (mp != NULL && (mp->mnt_flag & MNT_LOCAL) != 0 &&
373 ap->a_op == F_SETLK && (ap->a_flags & F_FIRSTOPEN) == 0) {
374 VI_LOCK(vp);
375 while ((vp->v_iflag & VI_FOPENING) != 0)
376 msleep(vp, VI_MTX(vp), PLOCK, "lockfo", 0);
377 VI_UNLOCK(vp);
378 }
379
380 if (ap->a_fl->l_whence == SEEK_END) {
381 /*
382 * The NFSv4 server must avoid doing a vn_lock() here, since it
383 * can deadlock the nfsd threads, due to a LOR. Fortunately
384 * the NFSv4 server always uses SEEK_SET and this code is
385 * only required for the SEEK_END case.
386 */
387 vn_lock(vp, LK_SHARED | LK_RETRY);
388 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
389 VOP_UNLOCK(vp);
390 if (error)
391 return (error);
392 } else
393 vattr.va_size = 0;
394
395 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
396 }
397
398 int
vop_stdadvlockasync(struct vop_advlockasync_args * ap)399 vop_stdadvlockasync(struct vop_advlockasync_args *ap)
400 {
401 struct vnode *vp;
402 struct vattr vattr;
403 int error;
404
405 vp = ap->a_vp;
406 if (ap->a_fl->l_whence == SEEK_END) {
407 /* The size argument is only needed for SEEK_END. */
408 vn_lock(vp, LK_SHARED | LK_RETRY);
409 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
410 VOP_UNLOCK(vp);
411 if (error)
412 return (error);
413 } else
414 vattr.va_size = 0;
415
416 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
417 }
418
419 int
vop_stdadvlockpurge(struct vop_advlockpurge_args * ap)420 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap)
421 {
422 struct vnode *vp;
423
424 vp = ap->a_vp;
425 lf_purgelocks(vp, &vp->v_lockf);
426 return (0);
427 }
428
429 /*
430 * vop_stdpathconf:
431 *
432 * Standard implementation of POSIX pathconf, to get information about limits
433 * for a filesystem.
434 * Override per filesystem for the case where the filesystem has smaller
435 * limits.
436 */
437 int
vop_stdpathconf(struct vop_pathconf_args * ap)438 vop_stdpathconf(struct vop_pathconf_args *ap)
439 {
440
441 switch (ap->a_name) {
442 case _PC_ASYNC_IO:
443 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO;
444 return (0);
445 case _PC_PATH_MAX:
446 *ap->a_retval = PATH_MAX;
447 return (0);
448 case _PC_ACL_EXTENDED:
449 case _PC_ACL_NFS4:
450 case _PC_CAP_PRESENT:
451 case _PC_DEALLOC_PRESENT:
452 case _PC_INF_PRESENT:
453 case _PC_MAC_PRESENT:
454 case _PC_NAMEDATTR_ENABLED:
455 case _PC_HAS_NAMEDATTR:
456 *ap->a_retval = 0;
457 return (0);
458 default:
459 return (EINVAL);
460 }
461 /* NOTREACHED */
462 }
463
464 /*
465 * Standard lock, unlock and islocked functions.
466 */
467 int
vop_stdlock(struct vop_lock1_args * ap)468 vop_stdlock(struct vop_lock1_args *ap)
469 {
470 struct vnode *vp = ap->a_vp;
471 struct mtx *ilk;
472
473 ilk = VI_MTX(vp);
474 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags,
475 &ilk->lock_object, ap->a_file, ap->a_line));
476 }
477
478 /* See above. */
479 int
vop_stdunlock(struct vop_unlock_args * ap)480 vop_stdunlock(struct vop_unlock_args *ap)
481 {
482 struct vnode *vp = ap->a_vp;
483
484 return (lockmgr_unlock(vp->v_vnlock));
485 }
486
487 /* See above. */
488 int
vop_stdislocked(struct vop_islocked_args * ap)489 vop_stdislocked(struct vop_islocked_args *ap)
490 {
491
492 return (lockstatus(ap->a_vp->v_vnlock));
493 }
494
495 /*
496 * Variants of the above set.
497 *
498 * Differences are:
499 * - shared locking disablement is not supported
500 * - v_vnlock pointer is not honored
501 */
502 int
vop_lock(struct vop_lock1_args * ap)503 vop_lock(struct vop_lock1_args *ap)
504 {
505 struct vnode *vp = ap->a_vp;
506 int flags = ap->a_flags;
507 struct mtx *ilk;
508
509 MPASS(vp->v_vnlock == &vp->v_lock);
510
511 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0))
512 goto other;
513
514 switch (flags & LK_TYPE_MASK) {
515 case LK_SHARED:
516 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line));
517 case LK_EXCLUSIVE:
518 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line));
519 }
520 other:
521 ilk = VI_MTX(vp);
522 return (lockmgr_lock_flags(&vp->v_lock, flags,
523 &ilk->lock_object, ap->a_file, ap->a_line));
524 }
525
526 int
vop_unlock(struct vop_unlock_args * ap)527 vop_unlock(struct vop_unlock_args *ap)
528 {
529 struct vnode *vp = ap->a_vp;
530
531 MPASS(vp->v_vnlock == &vp->v_lock);
532
533 return (lockmgr_unlock(&vp->v_lock));
534 }
535
536 int
vop_islocked(struct vop_islocked_args * ap)537 vop_islocked(struct vop_islocked_args *ap)
538 {
539 struct vnode *vp = ap->a_vp;
540
541 MPASS(vp->v_vnlock == &vp->v_lock);
542
543 return (lockstatus(&vp->v_lock));
544 }
545
546 /*
547 * Return true for select/poll.
548 */
549 int
vop_nopoll(struct vop_poll_args * ap)550 vop_nopoll(struct vop_poll_args *ap)
551 {
552
553 if (ap->a_events & ~POLLSTANDARD)
554 return (POLLNVAL);
555 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
556 }
557
558 /*
559 * Implement poll for local filesystems that support it.
560 */
561 int
vop_stdpoll(struct vop_poll_args * ap)562 vop_stdpoll(struct vop_poll_args *ap)
563 {
564 if (ap->a_events & ~POLLSTANDARD)
565 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
566 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
567 }
568
569 /*
570 * Return our mount point, as we will take charge of the writes.
571 */
572 int
vop_stdgetwritemount(struct vop_getwritemount_args * ap)573 vop_stdgetwritemount(struct vop_getwritemount_args *ap)
574 {
575 struct mount *mp;
576 struct vnode *vp;
577
578 /*
579 * Note that having a reference does not prevent forced unmount from
580 * setting ->v_mount to NULL after the lock gets released. This is of
581 * no consequence for typical consumers (most notably vn_start_write)
582 * since in this case the vnode is VIRF_DOOMED. Unmount might have
583 * progressed far enough that its completion is only delayed by the
584 * reference obtained here. The consumer only needs to concern itself
585 * with releasing it.
586 */
587 vp = ap->a_vp;
588 mp = vfs_ref_from_vp(vp);
589 *(ap->a_mpp) = mp;
590 return (0);
591 }
592
593 /*
594 * If the file system doesn't implement VOP_BMAP, then return sensible defaults:
595 * - Return the vnode's bufobj instead of any underlying device's bufobj
596 * - Calculate the physical block number as if there were equal size
597 * consecutive blocks, but
598 * - Report no contiguous runs of blocks.
599 */
600 int
vop_stdbmap(struct vop_bmap_args * ap)601 vop_stdbmap(struct vop_bmap_args *ap)
602 {
603
604 if (ap->a_bop != NULL)
605 *ap->a_bop = &ap->a_vp->v_bufobj;
606 if (ap->a_bnp != NULL)
607 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
608 if (ap->a_runp != NULL)
609 *ap->a_runp = 0;
610 if (ap->a_runb != NULL)
611 *ap->a_runb = 0;
612 return (0);
613 }
614
615 int
vop_stdfsync(struct vop_fsync_args * ap)616 vop_stdfsync(struct vop_fsync_args *ap)
617 {
618
619 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor));
620 }
621
622 static int
vop_stdfdatasync(struct vop_fdatasync_args * ap)623 vop_stdfdatasync(struct vop_fdatasync_args *ap)
624 {
625
626 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td));
627 }
628
629 int
vop_stdfdatasync_buf(struct vop_fdatasync_args * ap)630 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap)
631 {
632
633 return (vn_fsync_buf(ap->a_vp, MNT_WAIT));
634 }
635
636 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
637 int
vop_stdgetpages(struct vop_getpages_args * ap)638 vop_stdgetpages(struct vop_getpages_args *ap)
639 {
640
641 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
642 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL);
643 }
644
645 static int
vop_stdgetpages_async(struct vop_getpages_async_args * ap)646 vop_stdgetpages_async(struct vop_getpages_async_args *ap)
647 {
648 int error;
649
650 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind,
651 ap->a_rahead);
652 if (ap->a_iodone != NULL)
653 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error);
654 return (error);
655 }
656
657 int
vop_stdkqfilter(struct vop_kqfilter_args * ap)658 vop_stdkqfilter(struct vop_kqfilter_args *ap)
659 {
660 return vfs_kqfilter(ap);
661 }
662
663 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
664 int
vop_stdputpages(struct vop_putpages_args * ap)665 vop_stdputpages(struct vop_putpages_args *ap)
666 {
667
668 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
669 ap->a_sync, ap->a_rtvals);
670 }
671
672 int
vop_stdvptofh(struct vop_vptofh_args * ap)673 vop_stdvptofh(struct vop_vptofh_args *ap)
674 {
675 return (EOPNOTSUPP);
676 }
677
678 int
vop_stdvptocnp(struct vop_vptocnp_args * ap)679 vop_stdvptocnp(struct vop_vptocnp_args *ap)
680 {
681 struct vnode *const vp = ap->a_vp;
682 struct vnode **const dvp = ap->a_vpp;
683 char *buf = ap->a_buf;
684 size_t *buflen = ap->a_buflen;
685 char *dirbuf;
686 int i = *buflen;
687 int error = 0, covered = 0;
688 int eofflag, flags, locked;
689 size_t dirbuflen, len;
690 off_t off;
691 ino_t fileno;
692 struct vattr va;
693 struct nameidata nd;
694 struct thread *const td = curthread;
695 struct ucred *const cred = td->td_ucred;
696 struct dirent *dp;
697 struct vnode *mvp;
698
699 if (vp->v_type != VDIR)
700 return (ENOENT);
701
702 error = VOP_GETATTR(vp, &va, cred);
703 if (error)
704 return (error);
705
706 VREF(vp);
707 locked = VOP_ISLOCKED(vp);
708 VOP_UNLOCK(vp);
709 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE,
710 "..", vp);
711 flags = FREAD;
712 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL);
713 if (error) {
714 vn_lock(vp, locked | LK_RETRY);
715 return (error);
716 }
717 NDFREE_PNBUF(&nd);
718
719 mvp = *dvp = nd.ni_vp;
720
721 if (vp->v_mount != (*dvp)->v_mount &&
722 ((*dvp)->v_vflag & VV_ROOT) &&
723 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) {
724 *dvp = (*dvp)->v_mount->mnt_vnodecovered;
725 VREF(mvp);
726 VOP_UNLOCK(mvp);
727 vn_close(mvp, FREAD, cred, td);
728 VREF(*dvp);
729 vn_lock(*dvp, LK_SHARED | LK_RETRY);
730 covered = 1;
731 }
732
733 fileno = va.va_fileid;
734
735 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ);
736 if (dirbuflen < va.va_blocksize)
737 dirbuflen = va.va_blocksize;
738 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK);
739
740 if ((*dvp)->v_type != VDIR) {
741 error = ENOENT;
742 goto out;
743 }
744
745 len = 0;
746 off = 0;
747 eofflag = 0;
748
749 for (;;) {
750 /* call VOP_READDIR of parent */
751 error = vn_dir_next_dirent(*dvp, td,
752 dirbuf, dirbuflen, &dp, &len, &off, &eofflag);
753 if (error != 0)
754 goto out;
755
756 if (len == 0) {
757 error = ENOENT;
758 goto out;
759 }
760
761 if ((dp->d_type != DT_WHT) &&
762 (dp->d_fileno == fileno)) {
763 if (covered) {
764 VOP_UNLOCK(*dvp);
765 vn_lock(mvp, LK_SHARED | LK_RETRY);
766 if (dirent_exists(mvp, dp->d_name, td) == 0) {
767 error = ENOENT;
768 VOP_UNLOCK(mvp);
769 vn_lock(*dvp, LK_SHARED | LK_RETRY);
770 goto out;
771 }
772 VOP_UNLOCK(mvp);
773 vn_lock(*dvp, LK_SHARED | LK_RETRY);
774 }
775 i -= dp->d_namlen;
776
777 if (i < 0) {
778 error = ENOMEM;
779 goto out;
780 }
781 if (dp->d_namlen == 1 && dp->d_name[0] == '.') {
782 error = ENOENT;
783 } else {
784 bcopy(dp->d_name, buf + i, dp->d_namlen);
785 error = 0;
786 }
787 goto out;
788 }
789 }
790
791 out:
792 free(dirbuf, M_TEMP);
793 if (!error) {
794 *buflen = i;
795 vref(*dvp);
796 }
797 if (covered) {
798 vput(*dvp);
799 vrele(mvp);
800 } else {
801 VOP_UNLOCK(mvp);
802 vn_close(mvp, FREAD, cred, td);
803 }
804 vn_lock(vp, locked | LK_RETRY);
805 return (error);
806 }
807
808 int
vop_stdallocate(struct vop_allocate_args * ap)809 vop_stdallocate(struct vop_allocate_args *ap)
810 {
811 #ifdef __notyet__
812 struct statfs *sfs;
813 off_t maxfilesize = 0;
814 #endif
815 struct iovec aiov;
816 struct vattr vattr, *vap;
817 struct uio auio;
818 off_t fsize, len, cur, offset;
819 uint8_t *buf;
820 struct thread *td;
821 struct vnode *vp;
822 size_t iosize;
823 int error;
824
825 buf = NULL;
826 error = 0;
827 td = curthread;
828 vap = &vattr;
829 vp = ap->a_vp;
830 len = *ap->a_len;
831 offset = *ap->a_offset;
832
833 error = VOP_GETATTR(vp, vap, ap->a_cred);
834 if (error != 0)
835 goto out;
836 fsize = vap->va_size;
837 iosize = vap->va_blocksize;
838 if (iosize == 0)
839 iosize = BLKDEV_IOSIZE;
840 if (iosize > maxphys)
841 iosize = maxphys;
842 buf = malloc(iosize, M_TEMP, M_WAITOK);
843
844 #ifdef __notyet__
845 /*
846 * Check if the filesystem sets f_maxfilesize; if not use
847 * VOP_SETATTR to perform the check.
848 */
849 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
850 error = VFS_STATFS(vp->v_mount, sfs, td);
851 if (error == 0)
852 maxfilesize = sfs->f_maxfilesize;
853 free(sfs, M_STATFS);
854 if (error != 0)
855 goto out;
856 if (maxfilesize) {
857 if (offset > maxfilesize || len > maxfilesize ||
858 offset + len > maxfilesize) {
859 error = EFBIG;
860 goto out;
861 }
862 } else
863 #endif
864 if (offset + len > vap->va_size) {
865 /*
866 * Test offset + len against the filesystem's maxfilesize.
867 */
868 VATTR_NULL(vap);
869 vap->va_size = offset + len;
870 error = VOP_SETATTR(vp, vap, ap->a_cred);
871 if (error != 0)
872 goto out;
873 VATTR_NULL(vap);
874 vap->va_size = fsize;
875 error = VOP_SETATTR(vp, vap, ap->a_cred);
876 if (error != 0)
877 goto out;
878 }
879
880 for (;;) {
881 /*
882 * Read and write back anything below the nominal file
883 * size. There's currently no way outside the filesystem
884 * to know whether this area is sparse or not.
885 */
886 cur = iosize;
887 if ((offset % iosize) != 0)
888 cur -= (offset % iosize);
889 if (cur > len)
890 cur = len;
891 if (offset < fsize) {
892 aiov.iov_base = buf;
893 aiov.iov_len = cur;
894 auio.uio_iov = &aiov;
895 auio.uio_iovcnt = 1;
896 auio.uio_offset = offset;
897 auio.uio_resid = cur;
898 auio.uio_segflg = UIO_SYSSPACE;
899 auio.uio_rw = UIO_READ;
900 auio.uio_td = td;
901 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred);
902 if (error != 0)
903 break;
904 if (auio.uio_resid > 0) {
905 bzero(buf + cur - auio.uio_resid,
906 auio.uio_resid);
907 }
908 } else {
909 bzero(buf, cur);
910 }
911
912 aiov.iov_base = buf;
913 aiov.iov_len = cur;
914 auio.uio_iov = &aiov;
915 auio.uio_iovcnt = 1;
916 auio.uio_offset = offset;
917 auio.uio_resid = cur;
918 auio.uio_segflg = UIO_SYSSPACE;
919 auio.uio_rw = UIO_WRITE;
920 auio.uio_td = td;
921
922 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred);
923 if (error != 0)
924 break;
925
926 len -= cur;
927 offset += cur;
928 if (len == 0)
929 break;
930 if (should_yield())
931 break;
932 }
933
934 out:
935 *ap->a_len = len;
936 *ap->a_offset = offset;
937 free(buf, M_TEMP);
938 return (error);
939 }
940
941 static int
vp_zerofill(struct vnode * vp,struct vattr * vap,off_t * offsetp,off_t * lenp,int ioflag,struct ucred * cred)942 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp,
943 int ioflag, struct ucred *cred)
944 {
945 int iosize;
946 int error = 0;
947 struct iovec aiov;
948 struct uio auio;
949 struct thread *td;
950 off_t offset, len;
951
952 iosize = vap->va_blocksize;
953 td = curthread;
954 offset = *offsetp;
955 len = *lenp;
956
957 if (iosize == 0)
958 iosize = BLKDEV_IOSIZE;
959 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */
960 iosize = min(iosize * 8, ZERO_REGION_SIZE);
961
962 while (len > 0) {
963 int xfersize = iosize;
964 if (offset % iosize != 0)
965 xfersize -= offset % iosize;
966 if (xfersize > len)
967 xfersize = len;
968
969 aiov.iov_base = __DECONST(void *, zero_region);
970 aiov.iov_len = xfersize;
971 auio.uio_iov = &aiov;
972 auio.uio_iovcnt = 1;
973 auio.uio_offset = offset;
974 auio.uio_resid = xfersize;
975 auio.uio_segflg = UIO_SYSSPACE;
976 auio.uio_rw = UIO_WRITE;
977 auio.uio_td = td;
978
979 error = VOP_WRITE(vp, &auio, ioflag, cred);
980 if (error != 0) {
981 len -= xfersize - auio.uio_resid;
982 offset += xfersize - auio.uio_resid;
983 break;
984 }
985
986 len -= xfersize;
987 offset += xfersize;
988 }
989
990 *offsetp = offset;
991 *lenp = len;
992 return (error);
993 }
994
995 int
vop_stddeallocate(struct vop_deallocate_args * ap)996 vop_stddeallocate(struct vop_deallocate_args *ap)
997 {
998 struct vnode *vp;
999 off_t offset, len;
1000 struct ucred *cred;
1001 int error;
1002 struct vattr va;
1003 off_t noff, xfersize, rem;
1004
1005 vp = ap->a_vp;
1006 offset = *ap->a_offset;
1007 cred = ap->a_cred;
1008
1009 error = VOP_GETATTR(vp, &va, cred);
1010 if (error)
1011 return (error);
1012
1013 len = omin((off_t)va.va_size - offset, *ap->a_len);
1014 while (len > 0) {
1015 noff = offset;
1016 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred);
1017 if (error) {
1018 if (error != ENXIO)
1019 /* XXX: Is it okay to fallback further? */
1020 goto out;
1021
1022 /*
1023 * No more data region to be filled
1024 */
1025 offset += len;
1026 len = 0;
1027 error = 0;
1028 break;
1029 }
1030 KASSERT(noff >= offset, ("FIOSEEKDATA going backward"));
1031 if (noff != offset) {
1032 xfersize = omin(noff - offset, len);
1033 len -= xfersize;
1034 offset += xfersize;
1035 if (len == 0)
1036 break;
1037 }
1038 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred);
1039 if (error)
1040 goto out;
1041
1042 /* Fill zeroes */
1043 xfersize = rem = omin(noff - offset, len);
1044 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred);
1045 if (error) {
1046 len -= xfersize - rem;
1047 goto out;
1048 }
1049
1050 len -= xfersize;
1051 if (should_yield())
1052 break;
1053 }
1054 /* Handle the case when offset is beyond EOF */
1055 if (len < 0)
1056 len = 0;
1057 out:
1058 *ap->a_offset = offset;
1059 *ap->a_len = len;
1060 return (error);
1061 }
1062
1063 int
vop_stdadvise(struct vop_advise_args * ap)1064 vop_stdadvise(struct vop_advise_args *ap)
1065 {
1066 struct vnode *vp;
1067 struct bufobj *bo;
1068 uintmax_t bstart, bend;
1069 daddr_t startn, endn;
1070 int bsize, error;
1071
1072 vp = ap->a_vp;
1073 switch (ap->a_advice) {
1074 case POSIX_FADV_WILLNEED:
1075 /*
1076 * Do nothing for now. Filesystems should provide a
1077 * custom method which starts an asynchronous read of
1078 * the requested region.
1079 */
1080 error = 0;
1081 break;
1082 case POSIX_FADV_DONTNEED:
1083 error = 0;
1084 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1085 if (VN_IS_DOOMED(vp)) {
1086 VOP_UNLOCK(vp);
1087 break;
1088 }
1089
1090 /*
1091 * Round to block boundaries (and later possibly further to
1092 * page boundaries). Applications cannot reasonably be aware
1093 * of the boundaries, and the rounding must be to expand at
1094 * both extremities to cover enough. It still doesn't cover
1095 * read-ahead. For partial blocks, this gives unnecessary
1096 * discarding of buffers but is efficient enough since the
1097 * pages usually remain in VMIO for some time.
1098 */
1099 bsize = vp->v_bufobj.bo_bsize;
1100 bstart = rounddown(ap->a_start, bsize);
1101 bend = ap->a_end;
1102 bend = roundup(bend, bsize);
1103
1104 /*
1105 * Deactivate pages in the specified range from the backing VM
1106 * object. Pages that are resident in the buffer cache will
1107 * remain wired until their corresponding buffers are released
1108 * below.
1109 */
1110 if (vp->v_object != NULL) {
1111 VM_OBJECT_RLOCK(vp->v_object);
1112 vm_object_page_noreuse(vp->v_object,
1113 OFF_TO_IDX(trunc_page(bstart)),
1114 OFF_TO_IDX(round_page(bend)));
1115 VM_OBJECT_RUNLOCK(vp->v_object);
1116 }
1117
1118 bo = &vp->v_bufobj;
1119 startn = bstart / bsize;
1120 endn = bend / bsize;
1121 BO_RLOCK(bo);
1122 error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
1123 if (error == 0)
1124 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);
1125 BO_RUNLOCK(bo);
1126 VOP_UNLOCK(vp);
1127 break;
1128 default:
1129 error = EINVAL;
1130 break;
1131 }
1132 return (error);
1133 }
1134
1135 int
vop_stdunp_bind(struct vop_unp_bind_args * ap)1136 vop_stdunp_bind(struct vop_unp_bind_args *ap)
1137 {
1138
1139 ap->a_vp->v_unpcb = ap->a_unpcb;
1140 return (0);
1141 }
1142
1143 int
vop_stdunp_connect(struct vop_unp_connect_args * ap)1144 vop_stdunp_connect(struct vop_unp_connect_args *ap)
1145 {
1146
1147 *ap->a_unpcb = ap->a_vp->v_unpcb;
1148 return (0);
1149 }
1150
1151 int
vop_stdunp_detach(struct vop_unp_detach_args * ap)1152 vop_stdunp_detach(struct vop_unp_detach_args *ap)
1153 {
1154
1155 ap->a_vp->v_unpcb = NULL;
1156 return (0);
1157 }
1158
1159 static int
vop_stdis_text(struct vop_is_text_args * ap)1160 vop_stdis_text(struct vop_is_text_args *ap)
1161 {
1162
1163 return ((int)atomic_load_int(&ap->a_vp->v_writecount) < 0);
1164 }
1165
1166 int
vop_stdset_text(struct vop_set_text_args * ap)1167 vop_stdset_text(struct vop_set_text_args *ap)
1168 {
1169 struct vnode *vp;
1170 int n;
1171 bool gotref;
1172
1173 vp = ap->a_vp;
1174
1175 n = atomic_load_int(&vp->v_writecount);
1176 for (;;) {
1177 if (__predict_false(n > 0)) {
1178 return (ETXTBSY);
1179 }
1180
1181 /*
1182 * Transition point, we may need to grab a reference on the vnode.
1183 *
1184 * Take the ref early As a safety measure against bogus calls
1185 * to vop_stdunset_text.
1186 */
1187 if (n == 0) {
1188 gotref = false;
1189 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) {
1190 vref(vp);
1191 gotref = true;
1192 }
1193 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) {
1194 return (0);
1195 }
1196 if (gotref) {
1197 vunref(vp);
1198 }
1199 continue;
1200 }
1201
1202 MPASS(n < 0);
1203 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) {
1204 return (0);
1205 }
1206 }
1207 __assert_unreachable();
1208 }
1209
1210 static int
vop_stdunset_text(struct vop_unset_text_args * ap)1211 vop_stdunset_text(struct vop_unset_text_args *ap)
1212 {
1213 struct vnode *vp;
1214 int n;
1215
1216 vp = ap->a_vp;
1217
1218 n = atomic_load_int(&vp->v_writecount);
1219 for (;;) {
1220 if (__predict_false(n >= 0)) {
1221 return (EINVAL);
1222 }
1223
1224 /*
1225 * Transition point, we may need to release a reference on the vnode.
1226 */
1227 if (n == -1) {
1228 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) {
1229 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) {
1230 vunref(vp);
1231 }
1232 return (0);
1233 }
1234 continue;
1235 }
1236
1237 MPASS(n < -1);
1238 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) {
1239 return (0);
1240 }
1241 }
1242 __assert_unreachable();
1243 }
1244
1245 static __always_inline int
vop_stdadd_writecount_impl(struct vop_add_writecount_args * ap,bool handle_msync)1246 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync)
1247 {
1248 struct vnode *vp;
1249 struct mount *mp __diagused;
1250 int n;
1251
1252 vp = ap->a_vp;
1253
1254 #ifdef INVARIANTS
1255 mp = vp->v_mount;
1256 if (mp != NULL) {
1257 if (handle_msync) {
1258 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp);
1259 } else {
1260 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp);
1261 }
1262 }
1263 #endif
1264
1265 n = atomic_load_int(&vp->v_writecount);
1266 for (;;) {
1267 if (__predict_false(n < 0)) {
1268 return (ETXTBSY);
1269 }
1270
1271 VNASSERT(n + ap->a_inc >= 0, vp,
1272 ("neg writecount increment %d + %d = %d", n, ap->a_inc,
1273 n + ap->a_inc));
1274 if (n == 0) {
1275 if (handle_msync) {
1276 vlazy(vp);
1277 }
1278 }
1279
1280 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) {
1281 return (0);
1282 }
1283 }
1284 __assert_unreachable();
1285 }
1286
1287 int
vop_stdadd_writecount(struct vop_add_writecount_args * ap)1288 vop_stdadd_writecount(struct vop_add_writecount_args *ap)
1289 {
1290
1291 return (vop_stdadd_writecount_impl(ap, true));
1292 }
1293
1294 int
vop_stdadd_writecount_nomsync(struct vop_add_writecount_args * ap)1295 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap)
1296 {
1297
1298 return (vop_stdadd_writecount_impl(ap, false));
1299 }
1300
1301 int
vop_stdneed_inactive(struct vop_need_inactive_args * ap)1302 vop_stdneed_inactive(struct vop_need_inactive_args *ap)
1303 {
1304
1305 return (1);
1306 }
1307
1308 int
vop_stdioctl(struct vop_ioctl_args * ap)1309 vop_stdioctl(struct vop_ioctl_args *ap)
1310 {
1311 struct vnode *vp;
1312 struct vattr va;
1313 off_t *offp;
1314 int error;
1315
1316 switch (ap->a_command) {
1317 case FIOSEEKDATA:
1318 case FIOSEEKHOLE:
1319 vp = ap->a_vp;
1320 error = vn_lock(vp, LK_SHARED);
1321 if (error != 0)
1322 return (EBADF);
1323 if (vp->v_type == VREG)
1324 error = VOP_GETATTR(vp, &va, ap->a_cred);
1325 else
1326 error = ENOTTY;
1327 if (error == 0) {
1328 offp = ap->a_data;
1329 if (*offp < 0 || *offp >= va.va_size)
1330 error = ENXIO;
1331 else if (ap->a_command == FIOSEEKHOLE)
1332 *offp = va.va_size;
1333 }
1334 VOP_UNLOCK(vp);
1335 break;
1336 default:
1337 error = ENOTTY;
1338 break;
1339 }
1340 return (error);
1341 }
1342
1343 /*
1344 * vfs default ops
1345 * used to fill the vfs function table to get reasonable default return values.
1346 */
1347 int
vfs_stdroot(struct mount * mp,int flags,struct vnode ** vpp)1348 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp)
1349 {
1350
1351 return (EOPNOTSUPP);
1352 }
1353
1354 int
vfs_stdstatfs(struct mount * mp,struct statfs * sbp)1355 vfs_stdstatfs(struct mount *mp, struct statfs *sbp)
1356 {
1357
1358 return (EOPNOTSUPP);
1359 }
1360
1361 int
vfs_stdquotactl(struct mount * mp,int cmds,uid_t uid,void * arg,bool * mp_busy)1362 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy)
1363 {
1364 return (EOPNOTSUPP);
1365 }
1366
1367 int
vfs_stdsync(struct mount * mp,int waitfor)1368 vfs_stdsync(struct mount *mp, int waitfor)
1369 {
1370 struct vnode *vp, *mvp;
1371 struct thread *td;
1372 int error, lockreq, allerror = 0;
1373
1374 td = curthread;
1375 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
1376 if (waitfor != MNT_WAIT)
1377 lockreq |= LK_NOWAIT;
1378 /*
1379 * Force stale buffer cache information to be flushed.
1380 */
1381 loop:
1382 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1383 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
1384 VI_UNLOCK(vp);
1385 continue;
1386 }
1387 if ((error = vget(vp, lockreq)) != 0) {
1388 if (error == ENOENT) {
1389 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1390 goto loop;
1391 }
1392 continue;
1393 }
1394 error = VOP_FSYNC(vp, waitfor, td);
1395 if (error)
1396 allerror = error;
1397 vput(vp);
1398 }
1399 return (allerror);
1400 }
1401
1402 int
vfs_stdnosync(struct mount * mp,int waitfor)1403 vfs_stdnosync(struct mount *mp, int waitfor)
1404 {
1405
1406 return (0);
1407 }
1408
1409 static int
vop_stdcopy_file_range(struct vop_copy_file_range_args * ap)1410 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap)
1411 {
1412 int error;
1413
1414 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
1415 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred,
1416 ap->a_outcred, ap->a_fsizetd);
1417 return (error);
1418 }
1419
1420 int
vfs_stdvget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)1421 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
1422 {
1423
1424 return (EOPNOTSUPP);
1425 }
1426
1427 int
vfs_stdfhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)1428 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1429 {
1430
1431 return (EOPNOTSUPP);
1432 }
1433
1434 int
vfs_stdinit(struct vfsconf * vfsp)1435 vfs_stdinit(struct vfsconf *vfsp)
1436 {
1437
1438 return (0);
1439 }
1440
1441 int
vfs_stduninit(struct vfsconf * vfsp)1442 vfs_stduninit(struct vfsconf *vfsp)
1443 {
1444
1445 return(0);
1446 }
1447
1448 int
vfs_stdextattrctl(struct mount * mp,int cmd,struct vnode * filename_vp,int attrnamespace,const char * attrname)1449 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
1450 int attrnamespace, const char *attrname)
1451 {
1452
1453 if (filename_vp != NULL)
1454 VOP_UNLOCK(filename_vp);
1455 return (EOPNOTSUPP);
1456 }
1457
1458 int
vfs_stdsysctl(struct mount * mp,fsctlop_t op,struct sysctl_req * req)1459 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
1460 {
1461
1462 return (EOPNOTSUPP);
1463 }
1464
1465 static vop_bypass_t *
bp_by_off(struct vop_vector * vop,struct vop_generic_args * a)1466 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a)
1467 {
1468
1469 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset));
1470 }
1471
1472 int
vop_sigdefer(struct vop_vector * vop,struct vop_generic_args * a)1473 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a)
1474 {
1475 vop_bypass_t *bp;
1476 int prev_stops, rc;
1477
1478 bp = bp_by_off(vop, a);
1479 MPASS(bp != NULL);
1480
1481 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
1482 rc = bp(a);
1483 sigallowstop(prev_stops);
1484 return (rc);
1485 }
1486
1487 static int
vop_stdstat(struct vop_stat_args * a)1488 vop_stdstat(struct vop_stat_args *a)
1489 {
1490 struct vattr vattr;
1491 struct vattr *vap;
1492 struct vnode *vp;
1493 struct stat *sb;
1494 int error;
1495 u_short mode;
1496
1497 vp = a->a_vp;
1498 sb = a->a_sb;
1499
1500 error = vop_stat_helper_pre(a);
1501 if (error != 0)
1502 return (error);
1503
1504 vap = &vattr;
1505
1506 /*
1507 * Initialize defaults for new and unusual fields, so that file
1508 * systems which don't support these fields don't need to know
1509 * about them.
1510 */
1511 vap->va_birthtime.tv_sec = -1;
1512 vap->va_birthtime.tv_nsec = 0;
1513 vap->va_fsid = VNOVAL;
1514 vap->va_gen = 0;
1515 vap->va_rdev = NODEV;
1516 vap->va_filerev = 0;
1517 vap->va_bsdflags = 0;
1518
1519 error = VOP_GETATTR(vp, vap, a->a_active_cred);
1520 if (error)
1521 goto out;
1522
1523 /*
1524 * Zero the spare stat fields
1525 */
1526 bzero(sb, sizeof *sb);
1527
1528 /*
1529 * Copy from vattr table
1530 */
1531 if (vap->va_fsid != VNOVAL)
1532 sb->st_dev = vap->va_fsid;
1533 else
1534 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1535 sb->st_ino = vap->va_fileid;
1536 mode = vap->va_mode;
1537 switch (vap->va_type) {
1538 case VREG:
1539 mode |= S_IFREG;
1540 break;
1541 case VDIR:
1542 mode |= S_IFDIR;
1543 break;
1544 case VBLK:
1545 mode |= S_IFBLK;
1546 break;
1547 case VCHR:
1548 mode |= S_IFCHR;
1549 break;
1550 case VLNK:
1551 mode |= S_IFLNK;
1552 break;
1553 case VSOCK:
1554 mode |= S_IFSOCK;
1555 break;
1556 case VFIFO:
1557 mode |= S_IFIFO;
1558 break;
1559 default:
1560 error = EBADF;
1561 goto out;
1562 }
1563 sb->st_mode = mode;
1564 sb->st_nlink = vap->va_nlink;
1565 sb->st_uid = vap->va_uid;
1566 sb->st_gid = vap->va_gid;
1567 sb->st_rdev = vap->va_rdev;
1568 if (vap->va_size > OFF_MAX) {
1569 error = EOVERFLOW;
1570 goto out;
1571 }
1572 sb->st_size = vap->va_size;
1573 sb->st_atim.tv_sec = vap->va_atime.tv_sec;
1574 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec;
1575 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec;
1576 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec;
1577 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec;
1578 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec;
1579 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec;
1580 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec;
1581
1582 /*
1583 * According to www.opengroup.org, the meaning of st_blksize is
1584 * "a filesystem-specific preferred I/O block size for this
1585 * object. In some filesystem types, this may vary from file
1586 * to file"
1587 * Use minimum/default of PAGE_SIZE (e.g. for VCHR).
1588 */
1589
1590 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize);
1591 sb->st_flags = vap->va_flags;
1592 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1593 sb->st_gen = vap->va_gen;
1594 sb->st_filerev = vap->va_filerev;
1595 sb->st_bsdflags = vap->va_bsdflags;
1596 out:
1597 return (vop_stat_helper_post(a, error));
1598 }
1599
1600 static int
vop_stdread_pgcache(struct vop_read_pgcache_args * ap __unused)1601 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused)
1602 {
1603 return (EJUSTRETURN);
1604 }
1605
1606 static int
vop_stdvput_pair(struct vop_vput_pair_args * ap)1607 vop_stdvput_pair(struct vop_vput_pair_args *ap)
1608 {
1609 struct vnode *dvp, *vp, **vpp;
1610
1611 dvp = ap->a_dvp;
1612 vpp = ap->a_vpp;
1613 vput(dvp);
1614 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL)
1615 vput(vp);
1616 return (0);
1617 }
1618
1619 static int
vop_stdgetlowvnode(struct vop_getlowvnode_args * ap)1620 vop_stdgetlowvnode(struct vop_getlowvnode_args *ap)
1621 {
1622 vref(ap->a_vp);
1623 *ap->a_vplp = ap->a_vp;
1624 return (0);
1625 }
1626