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 *ap->a_retval = 0;
456 return (0);
457 default:
458 return (EINVAL);
459 }
460 /* NOTREACHED */
461 }
462
463 /*
464 * Standard lock, unlock and islocked functions.
465 */
466 int
vop_stdlock(struct vop_lock1_args * ap)467 vop_stdlock(struct vop_lock1_args *ap)
468 {
469 struct vnode *vp = ap->a_vp;
470 struct mtx *ilk;
471
472 ilk = VI_MTX(vp);
473 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags,
474 &ilk->lock_object, ap->a_file, ap->a_line));
475 }
476
477 /* See above. */
478 int
vop_stdunlock(struct vop_unlock_args * ap)479 vop_stdunlock(struct vop_unlock_args *ap)
480 {
481 struct vnode *vp = ap->a_vp;
482
483 return (lockmgr_unlock(vp->v_vnlock));
484 }
485
486 /* See above. */
487 int
vop_stdislocked(struct vop_islocked_args * ap)488 vop_stdislocked(struct vop_islocked_args *ap)
489 {
490
491 return (lockstatus(ap->a_vp->v_vnlock));
492 }
493
494 /*
495 * Variants of the above set.
496 *
497 * Differences are:
498 * - shared locking disablement is not supported
499 * - v_vnlock pointer is not honored
500 */
501 int
vop_lock(struct vop_lock1_args * ap)502 vop_lock(struct vop_lock1_args *ap)
503 {
504 struct vnode *vp = ap->a_vp;
505 int flags = ap->a_flags;
506 struct mtx *ilk;
507
508 MPASS(vp->v_vnlock == &vp->v_lock);
509
510 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0))
511 goto other;
512
513 switch (flags & LK_TYPE_MASK) {
514 case LK_SHARED:
515 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line));
516 case LK_EXCLUSIVE:
517 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line));
518 }
519 other:
520 ilk = VI_MTX(vp);
521 return (lockmgr_lock_flags(&vp->v_lock, flags,
522 &ilk->lock_object, ap->a_file, ap->a_line));
523 }
524
525 int
vop_unlock(struct vop_unlock_args * ap)526 vop_unlock(struct vop_unlock_args *ap)
527 {
528 struct vnode *vp = ap->a_vp;
529
530 MPASS(vp->v_vnlock == &vp->v_lock);
531
532 return (lockmgr_unlock(&vp->v_lock));
533 }
534
535 int
vop_islocked(struct vop_islocked_args * ap)536 vop_islocked(struct vop_islocked_args *ap)
537 {
538 struct vnode *vp = ap->a_vp;
539
540 MPASS(vp->v_vnlock == &vp->v_lock);
541
542 return (lockstatus(&vp->v_lock));
543 }
544
545 /*
546 * Return true for select/poll.
547 */
548 int
vop_nopoll(struct vop_poll_args * ap)549 vop_nopoll(struct vop_poll_args *ap)
550 {
551
552 if (ap->a_events & ~POLLSTANDARD)
553 return (POLLNVAL);
554 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
555 }
556
557 /*
558 * Implement poll for local filesystems that support it.
559 */
560 int
vop_stdpoll(struct vop_poll_args * ap)561 vop_stdpoll(struct vop_poll_args *ap)
562 {
563 if (ap->a_events & ~POLLSTANDARD)
564 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
565 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
566 }
567
568 /*
569 * Return our mount point, as we will take charge of the writes.
570 */
571 int
vop_stdgetwritemount(struct vop_getwritemount_args * ap)572 vop_stdgetwritemount(struct vop_getwritemount_args *ap)
573 {
574 struct mount *mp;
575 struct vnode *vp;
576
577 /*
578 * Note that having a reference does not prevent forced unmount from
579 * setting ->v_mount to NULL after the lock gets released. This is of
580 * no consequence for typical consumers (most notably vn_start_write)
581 * since in this case the vnode is VIRF_DOOMED. Unmount might have
582 * progressed far enough that its completion is only delayed by the
583 * reference obtained here. The consumer only needs to concern itself
584 * with releasing it.
585 */
586 vp = ap->a_vp;
587 mp = vfs_ref_from_vp(vp);
588 *(ap->a_mpp) = mp;
589 return (0);
590 }
591
592 /*
593 * If the file system doesn't implement VOP_BMAP, then return sensible defaults:
594 * - Return the vnode's bufobj instead of any underlying device's bufobj
595 * - Calculate the physical block number as if there were equal size
596 * consecutive blocks, but
597 * - Report no contiguous runs of blocks.
598 */
599 int
vop_stdbmap(struct vop_bmap_args * ap)600 vop_stdbmap(struct vop_bmap_args *ap)
601 {
602
603 if (ap->a_bop != NULL)
604 *ap->a_bop = &ap->a_vp->v_bufobj;
605 if (ap->a_bnp != NULL)
606 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
607 if (ap->a_runp != NULL)
608 *ap->a_runp = 0;
609 if (ap->a_runb != NULL)
610 *ap->a_runb = 0;
611 return (0);
612 }
613
614 int
vop_stdfsync(struct vop_fsync_args * ap)615 vop_stdfsync(struct vop_fsync_args *ap)
616 {
617
618 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor));
619 }
620
621 static int
vop_stdfdatasync(struct vop_fdatasync_args * ap)622 vop_stdfdatasync(struct vop_fdatasync_args *ap)
623 {
624
625 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td));
626 }
627
628 int
vop_stdfdatasync_buf(struct vop_fdatasync_args * ap)629 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap)
630 {
631
632 return (vn_fsync_buf(ap->a_vp, MNT_WAIT));
633 }
634
635 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
636 int
vop_stdgetpages(struct vop_getpages_args * ap)637 vop_stdgetpages(struct vop_getpages_args *ap)
638 {
639
640 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
641 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL);
642 }
643
644 static int
vop_stdgetpages_async(struct vop_getpages_async_args * ap)645 vop_stdgetpages_async(struct vop_getpages_async_args *ap)
646 {
647 int error;
648
649 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind,
650 ap->a_rahead);
651 if (ap->a_iodone != NULL)
652 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error);
653 return (error);
654 }
655
656 int
vop_stdkqfilter(struct vop_kqfilter_args * ap)657 vop_stdkqfilter(struct vop_kqfilter_args *ap)
658 {
659 return vfs_kqfilter(ap);
660 }
661
662 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
663 int
vop_stdputpages(struct vop_putpages_args * ap)664 vop_stdputpages(struct vop_putpages_args *ap)
665 {
666
667 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
668 ap->a_sync, ap->a_rtvals);
669 }
670
671 int
vop_stdvptofh(struct vop_vptofh_args * ap)672 vop_stdvptofh(struct vop_vptofh_args *ap)
673 {
674 return (EOPNOTSUPP);
675 }
676
677 int
vop_stdvptocnp(struct vop_vptocnp_args * ap)678 vop_stdvptocnp(struct vop_vptocnp_args *ap)
679 {
680 struct vnode *const vp = ap->a_vp;
681 struct vnode **const dvp = ap->a_vpp;
682 char *buf = ap->a_buf;
683 size_t *buflen = ap->a_buflen;
684 char *dirbuf;
685 int i = *buflen;
686 int error = 0, covered = 0;
687 int eofflag, flags, locked;
688 size_t dirbuflen, len;
689 off_t off;
690 ino_t fileno;
691 struct vattr va;
692 struct nameidata nd;
693 struct thread *const td = curthread;
694 struct ucred *const cred = td->td_ucred;
695 struct dirent *dp;
696 struct vnode *mvp;
697
698 if (vp->v_type != VDIR)
699 return (ENOENT);
700
701 error = VOP_GETATTR(vp, &va, cred);
702 if (error)
703 return (error);
704
705 VREF(vp);
706 locked = VOP_ISLOCKED(vp);
707 VOP_UNLOCK(vp);
708 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE,
709 "..", vp);
710 flags = FREAD;
711 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL);
712 if (error) {
713 vn_lock(vp, locked | LK_RETRY);
714 return (error);
715 }
716 NDFREE_PNBUF(&nd);
717
718 mvp = *dvp = nd.ni_vp;
719
720 if (vp->v_mount != (*dvp)->v_mount &&
721 ((*dvp)->v_vflag & VV_ROOT) &&
722 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) {
723 *dvp = (*dvp)->v_mount->mnt_vnodecovered;
724 VREF(mvp);
725 VOP_UNLOCK(mvp);
726 vn_close(mvp, FREAD, cred, td);
727 VREF(*dvp);
728 vn_lock(*dvp, LK_SHARED | LK_RETRY);
729 covered = 1;
730 }
731
732 fileno = va.va_fileid;
733
734 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ);
735 if (dirbuflen < va.va_blocksize)
736 dirbuflen = va.va_blocksize;
737 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK);
738
739 if ((*dvp)->v_type != VDIR) {
740 error = ENOENT;
741 goto out;
742 }
743
744 len = 0;
745 off = 0;
746 eofflag = 0;
747
748 for (;;) {
749 /* call VOP_READDIR of parent */
750 error = vn_dir_next_dirent(*dvp, td,
751 dirbuf, dirbuflen, &dp, &len, &off, &eofflag);
752 if (error != 0)
753 goto out;
754
755 if (len == 0) {
756 error = ENOENT;
757 goto out;
758 }
759
760 if ((dp->d_type != DT_WHT) &&
761 (dp->d_fileno == fileno)) {
762 if (covered) {
763 VOP_UNLOCK(*dvp);
764 vn_lock(mvp, LK_SHARED | LK_RETRY);
765 if (dirent_exists(mvp, dp->d_name, td) == 0) {
766 error = ENOENT;
767 VOP_UNLOCK(mvp);
768 vn_lock(*dvp, LK_SHARED | LK_RETRY);
769 goto out;
770 }
771 VOP_UNLOCK(mvp);
772 vn_lock(*dvp, LK_SHARED | LK_RETRY);
773 }
774 i -= dp->d_namlen;
775
776 if (i < 0) {
777 error = ENOMEM;
778 goto out;
779 }
780 if (dp->d_namlen == 1 && dp->d_name[0] == '.') {
781 error = ENOENT;
782 } else {
783 bcopy(dp->d_name, buf + i, dp->d_namlen);
784 error = 0;
785 }
786 goto out;
787 }
788 }
789
790 out:
791 free(dirbuf, M_TEMP);
792 if (!error) {
793 *buflen = i;
794 vref(*dvp);
795 }
796 if (covered) {
797 vput(*dvp);
798 vrele(mvp);
799 } else {
800 VOP_UNLOCK(mvp);
801 vn_close(mvp, FREAD, cred, td);
802 }
803 vn_lock(vp, locked | LK_RETRY);
804 return (error);
805 }
806
807 int
vop_stdallocate(struct vop_allocate_args * ap)808 vop_stdallocate(struct vop_allocate_args *ap)
809 {
810 #ifdef __notyet__
811 struct statfs *sfs;
812 off_t maxfilesize = 0;
813 #endif
814 struct iovec aiov;
815 struct vattr vattr, *vap;
816 struct uio auio;
817 off_t fsize, len, cur, offset;
818 uint8_t *buf;
819 struct thread *td;
820 struct vnode *vp;
821 size_t iosize;
822 int error;
823
824 buf = NULL;
825 error = 0;
826 td = curthread;
827 vap = &vattr;
828 vp = ap->a_vp;
829 len = *ap->a_len;
830 offset = *ap->a_offset;
831
832 error = VOP_GETATTR(vp, vap, ap->a_cred);
833 if (error != 0)
834 goto out;
835 fsize = vap->va_size;
836 iosize = vap->va_blocksize;
837 if (iosize == 0)
838 iosize = BLKDEV_IOSIZE;
839 if (iosize > maxphys)
840 iosize = maxphys;
841 buf = malloc(iosize, M_TEMP, M_WAITOK);
842
843 #ifdef __notyet__
844 /*
845 * Check if the filesystem sets f_maxfilesize; if not use
846 * VOP_SETATTR to perform the check.
847 */
848 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
849 error = VFS_STATFS(vp->v_mount, sfs, td);
850 if (error == 0)
851 maxfilesize = sfs->f_maxfilesize;
852 free(sfs, M_STATFS);
853 if (error != 0)
854 goto out;
855 if (maxfilesize) {
856 if (offset > maxfilesize || len > maxfilesize ||
857 offset + len > maxfilesize) {
858 error = EFBIG;
859 goto out;
860 }
861 } else
862 #endif
863 if (offset + len > vap->va_size) {
864 /*
865 * Test offset + len against the filesystem's maxfilesize.
866 */
867 VATTR_NULL(vap);
868 vap->va_size = offset + len;
869 error = VOP_SETATTR(vp, vap, ap->a_cred);
870 if (error != 0)
871 goto out;
872 VATTR_NULL(vap);
873 vap->va_size = fsize;
874 error = VOP_SETATTR(vp, vap, ap->a_cred);
875 if (error != 0)
876 goto out;
877 }
878
879 for (;;) {
880 /*
881 * Read and write back anything below the nominal file
882 * size. There's currently no way outside the filesystem
883 * to know whether this area is sparse or not.
884 */
885 cur = iosize;
886 if ((offset % iosize) != 0)
887 cur -= (offset % iosize);
888 if (cur > len)
889 cur = len;
890 if (offset < fsize) {
891 aiov.iov_base = buf;
892 aiov.iov_len = cur;
893 auio.uio_iov = &aiov;
894 auio.uio_iovcnt = 1;
895 auio.uio_offset = offset;
896 auio.uio_resid = cur;
897 auio.uio_segflg = UIO_SYSSPACE;
898 auio.uio_rw = UIO_READ;
899 auio.uio_td = td;
900 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred);
901 if (error != 0)
902 break;
903 if (auio.uio_resid > 0) {
904 bzero(buf + cur - auio.uio_resid,
905 auio.uio_resid);
906 }
907 } else {
908 bzero(buf, cur);
909 }
910
911 aiov.iov_base = buf;
912 aiov.iov_len = cur;
913 auio.uio_iov = &aiov;
914 auio.uio_iovcnt = 1;
915 auio.uio_offset = offset;
916 auio.uio_resid = cur;
917 auio.uio_segflg = UIO_SYSSPACE;
918 auio.uio_rw = UIO_WRITE;
919 auio.uio_td = td;
920
921 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred);
922 if (error != 0)
923 break;
924
925 len -= cur;
926 offset += cur;
927 if (len == 0)
928 break;
929 if (should_yield())
930 break;
931 }
932
933 out:
934 *ap->a_len = len;
935 *ap->a_offset = offset;
936 free(buf, M_TEMP);
937 return (error);
938 }
939
940 static int
vp_zerofill(struct vnode * vp,struct vattr * vap,off_t * offsetp,off_t * lenp,int ioflag,struct ucred * cred)941 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp,
942 int ioflag, struct ucred *cred)
943 {
944 int iosize;
945 int error = 0;
946 struct iovec aiov;
947 struct uio auio;
948 struct thread *td;
949 off_t offset, len;
950
951 iosize = vap->va_blocksize;
952 td = curthread;
953 offset = *offsetp;
954 len = *lenp;
955
956 if (iosize == 0)
957 iosize = BLKDEV_IOSIZE;
958 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */
959 iosize = min(iosize * 8, ZERO_REGION_SIZE);
960
961 while (len > 0) {
962 int xfersize = iosize;
963 if (offset % iosize != 0)
964 xfersize -= offset % iosize;
965 if (xfersize > len)
966 xfersize = len;
967
968 aiov.iov_base = __DECONST(void *, zero_region);
969 aiov.iov_len = xfersize;
970 auio.uio_iov = &aiov;
971 auio.uio_iovcnt = 1;
972 auio.uio_offset = offset;
973 auio.uio_resid = xfersize;
974 auio.uio_segflg = UIO_SYSSPACE;
975 auio.uio_rw = UIO_WRITE;
976 auio.uio_td = td;
977
978 error = VOP_WRITE(vp, &auio, ioflag, cred);
979 if (error != 0) {
980 len -= xfersize - auio.uio_resid;
981 offset += xfersize - auio.uio_resid;
982 break;
983 }
984
985 len -= xfersize;
986 offset += xfersize;
987 }
988
989 *offsetp = offset;
990 *lenp = len;
991 return (error);
992 }
993
994 int
vop_stddeallocate(struct vop_deallocate_args * ap)995 vop_stddeallocate(struct vop_deallocate_args *ap)
996 {
997 struct vnode *vp;
998 off_t offset, len;
999 struct ucred *cred;
1000 int error;
1001 struct vattr va;
1002 off_t noff, xfersize, rem;
1003
1004 vp = ap->a_vp;
1005 offset = *ap->a_offset;
1006 cred = ap->a_cred;
1007
1008 error = VOP_GETATTR(vp, &va, cred);
1009 if (error)
1010 return (error);
1011
1012 len = omin((off_t)va.va_size - offset, *ap->a_len);
1013 while (len > 0) {
1014 noff = offset;
1015 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred);
1016 if (error) {
1017 if (error != ENXIO)
1018 /* XXX: Is it okay to fallback further? */
1019 goto out;
1020
1021 /*
1022 * No more data region to be filled
1023 */
1024 offset += len;
1025 len = 0;
1026 error = 0;
1027 break;
1028 }
1029 KASSERT(noff >= offset, ("FIOSEEKDATA going backward"));
1030 if (noff != offset) {
1031 xfersize = omin(noff - offset, len);
1032 len -= xfersize;
1033 offset += xfersize;
1034 if (len == 0)
1035 break;
1036 }
1037 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred);
1038 if (error)
1039 goto out;
1040
1041 /* Fill zeroes */
1042 xfersize = rem = omin(noff - offset, len);
1043 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred);
1044 if (error) {
1045 len -= xfersize - rem;
1046 goto out;
1047 }
1048
1049 len -= xfersize;
1050 if (should_yield())
1051 break;
1052 }
1053 /* Handle the case when offset is beyond EOF */
1054 if (len < 0)
1055 len = 0;
1056 out:
1057 *ap->a_offset = offset;
1058 *ap->a_len = len;
1059 return (error);
1060 }
1061
1062 int
vop_stdadvise(struct vop_advise_args * ap)1063 vop_stdadvise(struct vop_advise_args *ap)
1064 {
1065 struct vnode *vp;
1066 struct bufobj *bo;
1067 uintmax_t bstart, bend;
1068 daddr_t startn, endn;
1069 int bsize, error;
1070
1071 vp = ap->a_vp;
1072 switch (ap->a_advice) {
1073 case POSIX_FADV_WILLNEED:
1074 /*
1075 * Do nothing for now. Filesystems should provide a
1076 * custom method which starts an asynchronous read of
1077 * the requested region.
1078 */
1079 error = 0;
1080 break;
1081 case POSIX_FADV_DONTNEED:
1082 error = 0;
1083 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1084 if (VN_IS_DOOMED(vp)) {
1085 VOP_UNLOCK(vp);
1086 break;
1087 }
1088
1089 /*
1090 * Round to block boundaries (and later possibly further to
1091 * page boundaries). Applications cannot reasonably be aware
1092 * of the boundaries, and the rounding must be to expand at
1093 * both extremities to cover enough. It still doesn't cover
1094 * read-ahead. For partial blocks, this gives unnecessary
1095 * discarding of buffers but is efficient enough since the
1096 * pages usually remain in VMIO for some time.
1097 */
1098 bsize = vp->v_bufobj.bo_bsize;
1099 bstart = rounddown(ap->a_start, bsize);
1100 bend = ap->a_end;
1101 bend = roundup(bend, bsize);
1102
1103 /*
1104 * Deactivate pages in the specified range from the backing VM
1105 * object. Pages that are resident in the buffer cache will
1106 * remain wired until their corresponding buffers are released
1107 * below.
1108 */
1109 if (vp->v_object != NULL) {
1110 VM_OBJECT_RLOCK(vp->v_object);
1111 vm_object_page_noreuse(vp->v_object,
1112 OFF_TO_IDX(trunc_page(bstart)),
1113 OFF_TO_IDX(round_page(bend)));
1114 VM_OBJECT_RUNLOCK(vp->v_object);
1115 }
1116
1117 bo = &vp->v_bufobj;
1118 startn = bstart / bsize;
1119 endn = bend / bsize;
1120 BO_RLOCK(bo);
1121 error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
1122 if (error == 0)
1123 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);
1124 BO_RUNLOCK(bo);
1125 VOP_UNLOCK(vp);
1126 break;
1127 default:
1128 error = EINVAL;
1129 break;
1130 }
1131 return (error);
1132 }
1133
1134 int
vop_stdunp_bind(struct vop_unp_bind_args * ap)1135 vop_stdunp_bind(struct vop_unp_bind_args *ap)
1136 {
1137
1138 ap->a_vp->v_unpcb = ap->a_unpcb;
1139 return (0);
1140 }
1141
1142 int
vop_stdunp_connect(struct vop_unp_connect_args * ap)1143 vop_stdunp_connect(struct vop_unp_connect_args *ap)
1144 {
1145
1146 *ap->a_unpcb = ap->a_vp->v_unpcb;
1147 return (0);
1148 }
1149
1150 int
vop_stdunp_detach(struct vop_unp_detach_args * ap)1151 vop_stdunp_detach(struct vop_unp_detach_args *ap)
1152 {
1153
1154 ap->a_vp->v_unpcb = NULL;
1155 return (0);
1156 }
1157
1158 static int
vop_stdis_text(struct vop_is_text_args * ap)1159 vop_stdis_text(struct vop_is_text_args *ap)
1160 {
1161
1162 return ((int)atomic_load_int(&ap->a_vp->v_writecount) < 0);
1163 }
1164
1165 int
vop_stdset_text(struct vop_set_text_args * ap)1166 vop_stdset_text(struct vop_set_text_args *ap)
1167 {
1168 struct vnode *vp;
1169 int n;
1170 bool gotref;
1171
1172 vp = ap->a_vp;
1173
1174 n = atomic_load_int(&vp->v_writecount);
1175 for (;;) {
1176 if (__predict_false(n > 0)) {
1177 return (ETXTBSY);
1178 }
1179
1180 /*
1181 * Transition point, we may need to grab a reference on the vnode.
1182 *
1183 * Take the ref early As a safety measure against bogus calls
1184 * to vop_stdunset_text.
1185 */
1186 if (n == 0) {
1187 gotref = false;
1188 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) {
1189 vref(vp);
1190 gotref = true;
1191 }
1192 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) {
1193 return (0);
1194 }
1195 if (gotref) {
1196 vunref(vp);
1197 }
1198 continue;
1199 }
1200
1201 MPASS(n < 0);
1202 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) {
1203 return (0);
1204 }
1205 }
1206 __assert_unreachable();
1207 }
1208
1209 static int
vop_stdunset_text(struct vop_unset_text_args * ap)1210 vop_stdunset_text(struct vop_unset_text_args *ap)
1211 {
1212 struct vnode *vp;
1213 int n;
1214
1215 vp = ap->a_vp;
1216
1217 n = atomic_load_int(&vp->v_writecount);
1218 for (;;) {
1219 if (__predict_false(n >= 0)) {
1220 return (EINVAL);
1221 }
1222
1223 /*
1224 * Transition point, we may need to release a reference on the vnode.
1225 */
1226 if (n == -1) {
1227 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) {
1228 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) {
1229 vunref(vp);
1230 }
1231 return (0);
1232 }
1233 continue;
1234 }
1235
1236 MPASS(n < -1);
1237 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) {
1238 return (0);
1239 }
1240 }
1241 __assert_unreachable();
1242 }
1243
1244 static __always_inline int
vop_stdadd_writecount_impl(struct vop_add_writecount_args * ap,bool handle_msync)1245 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync)
1246 {
1247 struct vnode *vp;
1248 struct mount *mp __diagused;
1249 int n;
1250
1251 vp = ap->a_vp;
1252
1253 #ifdef INVARIANTS
1254 mp = vp->v_mount;
1255 if (mp != NULL) {
1256 if (handle_msync) {
1257 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp);
1258 } else {
1259 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp);
1260 }
1261 }
1262 #endif
1263
1264 n = atomic_load_int(&vp->v_writecount);
1265 for (;;) {
1266 if (__predict_false(n < 0)) {
1267 return (ETXTBSY);
1268 }
1269
1270 VNASSERT(n + ap->a_inc >= 0, vp,
1271 ("neg writecount increment %d + %d = %d", n, ap->a_inc,
1272 n + ap->a_inc));
1273 if (n == 0) {
1274 if (handle_msync) {
1275 vlazy(vp);
1276 }
1277 }
1278
1279 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) {
1280 return (0);
1281 }
1282 }
1283 __assert_unreachable();
1284 }
1285
1286 int
vop_stdadd_writecount(struct vop_add_writecount_args * ap)1287 vop_stdadd_writecount(struct vop_add_writecount_args *ap)
1288 {
1289
1290 return (vop_stdadd_writecount_impl(ap, true));
1291 }
1292
1293 int
vop_stdadd_writecount_nomsync(struct vop_add_writecount_args * ap)1294 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap)
1295 {
1296
1297 return (vop_stdadd_writecount_impl(ap, false));
1298 }
1299
1300 int
vop_stdneed_inactive(struct vop_need_inactive_args * ap)1301 vop_stdneed_inactive(struct vop_need_inactive_args *ap)
1302 {
1303
1304 return (1);
1305 }
1306
1307 int
vop_stdioctl(struct vop_ioctl_args * ap)1308 vop_stdioctl(struct vop_ioctl_args *ap)
1309 {
1310 struct vnode *vp;
1311 struct vattr va;
1312 off_t *offp;
1313 int error;
1314
1315 switch (ap->a_command) {
1316 case FIOSEEKDATA:
1317 case FIOSEEKHOLE:
1318 vp = ap->a_vp;
1319 error = vn_lock(vp, LK_SHARED);
1320 if (error != 0)
1321 return (EBADF);
1322 if (vp->v_type == VREG)
1323 error = VOP_GETATTR(vp, &va, ap->a_cred);
1324 else
1325 error = ENOTTY;
1326 if (error == 0) {
1327 offp = ap->a_data;
1328 if (*offp < 0 || *offp >= va.va_size)
1329 error = ENXIO;
1330 else if (ap->a_command == FIOSEEKHOLE)
1331 *offp = va.va_size;
1332 }
1333 VOP_UNLOCK(vp);
1334 break;
1335 default:
1336 error = ENOTTY;
1337 break;
1338 }
1339 return (error);
1340 }
1341
1342 /*
1343 * vfs default ops
1344 * used to fill the vfs function table to get reasonable default return values.
1345 */
1346 int
vfs_stdroot(struct mount * mp,int flags,struct vnode ** vpp)1347 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp)
1348 {
1349
1350 return (EOPNOTSUPP);
1351 }
1352
1353 int
vfs_stdstatfs(struct mount * mp,struct statfs * sbp)1354 vfs_stdstatfs(struct mount *mp, struct statfs *sbp)
1355 {
1356
1357 return (EOPNOTSUPP);
1358 }
1359
1360 int
vfs_stdquotactl(struct mount * mp,int cmds,uid_t uid,void * arg,bool * mp_busy)1361 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy)
1362 {
1363 return (EOPNOTSUPP);
1364 }
1365
1366 int
vfs_stdsync(struct mount * mp,int waitfor)1367 vfs_stdsync(struct mount *mp, int waitfor)
1368 {
1369 struct vnode *vp, *mvp;
1370 struct thread *td;
1371 int error, lockreq, allerror = 0;
1372
1373 td = curthread;
1374 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
1375 if (waitfor != MNT_WAIT)
1376 lockreq |= LK_NOWAIT;
1377 /*
1378 * Force stale buffer cache information to be flushed.
1379 */
1380 loop:
1381 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1382 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
1383 VI_UNLOCK(vp);
1384 continue;
1385 }
1386 if ((error = vget(vp, lockreq)) != 0) {
1387 if (error == ENOENT) {
1388 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1389 goto loop;
1390 }
1391 continue;
1392 }
1393 error = VOP_FSYNC(vp, waitfor, td);
1394 if (error)
1395 allerror = error;
1396 vput(vp);
1397 }
1398 return (allerror);
1399 }
1400
1401 int
vfs_stdnosync(struct mount * mp,int waitfor)1402 vfs_stdnosync(struct mount *mp, int waitfor)
1403 {
1404
1405 return (0);
1406 }
1407
1408 static int
vop_stdcopy_file_range(struct vop_copy_file_range_args * ap)1409 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap)
1410 {
1411 int error;
1412
1413 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
1414 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred,
1415 ap->a_outcred, ap->a_fsizetd);
1416 return (error);
1417 }
1418
1419 int
vfs_stdvget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)1420 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
1421 {
1422
1423 return (EOPNOTSUPP);
1424 }
1425
1426 int
vfs_stdfhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)1427 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1428 {
1429
1430 return (EOPNOTSUPP);
1431 }
1432
1433 int
vfs_stdinit(struct vfsconf * vfsp)1434 vfs_stdinit(struct vfsconf *vfsp)
1435 {
1436
1437 return (0);
1438 }
1439
1440 int
vfs_stduninit(struct vfsconf * vfsp)1441 vfs_stduninit(struct vfsconf *vfsp)
1442 {
1443
1444 return(0);
1445 }
1446
1447 int
vfs_stdextattrctl(struct mount * mp,int cmd,struct vnode * filename_vp,int attrnamespace,const char * attrname)1448 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
1449 int attrnamespace, const char *attrname)
1450 {
1451
1452 if (filename_vp != NULL)
1453 VOP_UNLOCK(filename_vp);
1454 return (EOPNOTSUPP);
1455 }
1456
1457 int
vfs_stdsysctl(struct mount * mp,fsctlop_t op,struct sysctl_req * req)1458 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
1459 {
1460
1461 return (EOPNOTSUPP);
1462 }
1463
1464 static vop_bypass_t *
bp_by_off(struct vop_vector * vop,struct vop_generic_args * a)1465 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a)
1466 {
1467
1468 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset));
1469 }
1470
1471 int
vop_sigdefer(struct vop_vector * vop,struct vop_generic_args * a)1472 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a)
1473 {
1474 vop_bypass_t *bp;
1475 int prev_stops, rc;
1476
1477 bp = bp_by_off(vop, a);
1478 MPASS(bp != NULL);
1479
1480 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
1481 rc = bp(a);
1482 sigallowstop(prev_stops);
1483 return (rc);
1484 }
1485
1486 static int
vop_stdstat(struct vop_stat_args * a)1487 vop_stdstat(struct vop_stat_args *a)
1488 {
1489 struct vattr vattr;
1490 struct vattr *vap;
1491 struct vnode *vp;
1492 struct stat *sb;
1493 int error;
1494 u_short mode;
1495
1496 vp = a->a_vp;
1497 sb = a->a_sb;
1498
1499 error = vop_stat_helper_pre(a);
1500 if (error != 0)
1501 return (error);
1502
1503 vap = &vattr;
1504
1505 /*
1506 * Initialize defaults for new and unusual fields, so that file
1507 * systems which don't support these fields don't need to know
1508 * about them.
1509 */
1510 vap->va_birthtime.tv_sec = -1;
1511 vap->va_birthtime.tv_nsec = 0;
1512 vap->va_fsid = VNOVAL;
1513 vap->va_gen = 0;
1514 vap->va_rdev = NODEV;
1515 vap->va_filerev = 0;
1516 vap->va_bsdflags = 0;
1517
1518 error = VOP_GETATTR(vp, vap, a->a_active_cred);
1519 if (error)
1520 goto out;
1521
1522 /*
1523 * Zero the spare stat fields
1524 */
1525 bzero(sb, sizeof *sb);
1526
1527 /*
1528 * Copy from vattr table
1529 */
1530 if (vap->va_fsid != VNOVAL)
1531 sb->st_dev = vap->va_fsid;
1532 else
1533 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1534 sb->st_ino = vap->va_fileid;
1535 mode = vap->va_mode;
1536 switch (vap->va_type) {
1537 case VREG:
1538 mode |= S_IFREG;
1539 break;
1540 case VDIR:
1541 mode |= S_IFDIR;
1542 break;
1543 case VBLK:
1544 mode |= S_IFBLK;
1545 break;
1546 case VCHR:
1547 mode |= S_IFCHR;
1548 break;
1549 case VLNK:
1550 mode |= S_IFLNK;
1551 break;
1552 case VSOCK:
1553 mode |= S_IFSOCK;
1554 break;
1555 case VFIFO:
1556 mode |= S_IFIFO;
1557 break;
1558 default:
1559 error = EBADF;
1560 goto out;
1561 }
1562 sb->st_mode = mode;
1563 sb->st_nlink = vap->va_nlink;
1564 sb->st_uid = vap->va_uid;
1565 sb->st_gid = vap->va_gid;
1566 sb->st_rdev = vap->va_rdev;
1567 if (vap->va_size > OFF_MAX) {
1568 error = EOVERFLOW;
1569 goto out;
1570 }
1571 sb->st_size = vap->va_size;
1572 sb->st_atim.tv_sec = vap->va_atime.tv_sec;
1573 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec;
1574 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec;
1575 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec;
1576 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec;
1577 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec;
1578 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec;
1579 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec;
1580
1581 /*
1582 * According to www.opengroup.org, the meaning of st_blksize is
1583 * "a filesystem-specific preferred I/O block size for this
1584 * object. In some filesystem types, this may vary from file
1585 * to file"
1586 * Use minimum/default of PAGE_SIZE (e.g. for VCHR).
1587 */
1588
1589 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize);
1590 sb->st_flags = vap->va_flags;
1591 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1592 sb->st_gen = vap->va_gen;
1593 sb->st_filerev = vap->va_filerev;
1594 sb->st_bsdflags = vap->va_bsdflags;
1595 out:
1596 return (vop_stat_helper_post(a, error));
1597 }
1598
1599 static int
vop_stdread_pgcache(struct vop_read_pgcache_args * ap __unused)1600 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused)
1601 {
1602 return (EJUSTRETURN);
1603 }
1604
1605 static int
vop_stdvput_pair(struct vop_vput_pair_args * ap)1606 vop_stdvput_pair(struct vop_vput_pair_args *ap)
1607 {
1608 struct vnode *dvp, *vp, **vpp;
1609
1610 dvp = ap->a_dvp;
1611 vpp = ap->a_vpp;
1612 vput(dvp);
1613 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL)
1614 vput(vp);
1615 return (0);
1616 }
1617
1618 static int
vop_stdgetlowvnode(struct vop_getlowvnode_args * ap)1619 vop_stdgetlowvnode(struct vop_getlowvnode_args *ap)
1620 {
1621 vref(ap->a_vp);
1622 *ap->a_vplp = ap->a_vp;
1623 return (0);
1624 }
1625