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/inotify.h>
43 #include <sys/kernel.h>
44 #include <sys/limits.h>
45 #include <sys/lock.h>
46 #include <sys/lockf.h>
47 #include <sys/malloc.h>
48 #include <sys/mount.h>
49 #include <sys/namei.h>
50 #include <sys/rwlock.h>
51 #include <sys/fcntl.h>
52 #include <sys/unistd.h>
53 #include <sys/vnode.h>
54 #include <sys/dirent.h>
55 #include <sys/poll.h>
56 #include <sys/stat.h>
57 #include <security/audit/audit.h>
58 #include <sys/priv.h>
59
60 #include <security/mac/mac_framework.h>
61
62 #include <vm/vm.h>
63 #include <vm/vm_object.h>
64 #include <vm/vm_extern.h>
65 #include <vm/pmap.h>
66 #include <vm/vm_map.h>
67 #include <vm/vm_page.h>
68 #include <vm/vm_pager.h>
69 #include <vm/vnode_pager.h>
70
71 static int vop_nolookup(struct vop_lookup_args *);
72 static int vop_norename(struct vop_rename_args *);
73 static int vop_nostrategy(struct vop_strategy_args *);
74 static int dirent_exists(struct vnode *vp, const char *dirname,
75 struct thread *td);
76
77 static int vop_stdis_text(struct vop_is_text_args *ap);
78 static int vop_stdunset_text(struct vop_unset_text_args *ap);
79 static int vop_stdadd_writecount(struct vop_add_writecount_args *ap);
80 static int vop_stdcopy_file_range(struct vop_copy_file_range_args *ap);
81 static int vop_stdfdatasync(struct vop_fdatasync_args *ap);
82 static int vop_stdgetpages_async(struct vop_getpages_async_args *ap);
83 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap);
84 static int vop_stdstat(struct vop_stat_args *ap);
85 static int vop_stdvput_pair(struct vop_vput_pair_args *ap);
86 static int vop_stdgetlowvnode(struct vop_getlowvnode_args *ap);
87
88 /*
89 * This vnode table stores what we want to do if the filesystem doesn't
90 * implement a particular VOP.
91 *
92 * If there is no specific entry here, we will return EOPNOTSUPP.
93 *
94 * Note that every filesystem has to implement either vop_access
95 * or vop_accessx; failing to do so will result in immediate crash
96 * due to stack overflow, as vop_stdaccess() calls vop_stdaccessx(),
97 * which calls vop_stdaccess() etc.
98 */
99
100 struct vop_vector default_vnodeops = {
101 .vop_default = NULL,
102 .vop_bypass = VOP_EOPNOTSUPP,
103
104 .vop_access = vop_stdaccess,
105 .vop_accessx = vop_stdaccessx,
106 .vop_advise = vop_stdadvise,
107 .vop_advlock = vop_stdadvlock,
108 .vop_advlockasync = vop_stdadvlockasync,
109 .vop_advlockpurge = vop_stdadvlockpurge,
110 .vop_allocate = vop_stdallocate,
111 .vop_deallocate = vop_stddeallocate,
112 .vop_bmap = vop_stdbmap,
113 .vop_close = VOP_NULL,
114 .vop_fsync = VOP_NULL,
115 .vop_stat = vop_stdstat,
116 .vop_fdatasync = vop_stdfdatasync,
117 .vop_getlowvnode = vop_stdgetlowvnode,
118 .vop_getpages = vop_stdgetpages,
119 .vop_getpages_async = vop_stdgetpages_async,
120 .vop_getwritemount = vop_stdgetwritemount,
121 .vop_inactive = VOP_NULL,
122 .vop_need_inactive = vop_stdneed_inactive,
123 .vop_inotify = vop_stdinotify,
124 .vop_inotify_add_watch = vop_stdinotify_add_watch,
125 .vop_ioctl = vop_stdioctl,
126 .vop_kqfilter = vop_stdkqfilter,
127 .vop_islocked = vop_stdislocked,
128 .vop_lock1 = vop_stdlock,
129 .vop_lookup = vop_nolookup,
130 .vop_open = VOP_NULL,
131 .vop_pathconf = VOP_EINVAL,
132 .vop_poll = vop_nopoll,
133 .vop_putpages = vop_stdputpages,
134 .vop_readlink = VOP_EINVAL,
135 .vop_read_pgcache = vop_stdread_pgcache,
136 .vop_rename = vop_norename,
137 .vop_revoke = VOP_PANIC,
138 .vop_strategy = vop_nostrategy,
139 .vop_unlock = vop_stdunlock,
140 .vop_vptocnp = vop_stdvptocnp,
141 .vop_vptofh = vop_stdvptofh,
142 .vop_unp_bind = vop_stdunp_bind,
143 .vop_unp_connect = vop_stdunp_connect,
144 .vop_unp_detach = vop_stdunp_detach,
145 .vop_is_text = vop_stdis_text,
146 .vop_set_text = vop_stdset_text,
147 .vop_unset_text = vop_stdunset_text,
148 .vop_add_writecount = vop_stdadd_writecount,
149 .vop_copy_file_range = vop_stdcopy_file_range,
150 .vop_vput_pair = vop_stdvput_pair,
151 };
152 VFS_VOP_VECTOR_REGISTER(default_vnodeops);
153
154 /*
155 * Series of placeholder functions for various error returns for
156 * VOPs.
157 */
158
159 int
vop_eopnotsupp(struct vop_generic_args * ap)160 vop_eopnotsupp(struct vop_generic_args *ap)
161 {
162 /*
163 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
164 */
165
166 return (EOPNOTSUPP);
167 }
168
169 int
vop_ebadf(struct vop_generic_args * ap)170 vop_ebadf(struct vop_generic_args *ap)
171 {
172
173 return (EBADF);
174 }
175
176 int
vop_enotty(struct vop_generic_args * ap)177 vop_enotty(struct vop_generic_args *ap)
178 {
179
180 return (ENOTTY);
181 }
182
183 int
vop_einval(struct vop_generic_args * ap)184 vop_einval(struct vop_generic_args *ap)
185 {
186
187 return (EINVAL);
188 }
189
190 int
vop_enoent(struct vop_generic_args * ap)191 vop_enoent(struct vop_generic_args *ap)
192 {
193
194 return (ENOENT);
195 }
196
197 int
vop_eagain(struct vop_generic_args * ap)198 vop_eagain(struct vop_generic_args *ap)
199 {
200
201 return (EAGAIN);
202 }
203
204 int
vop_null(struct vop_generic_args * ap)205 vop_null(struct vop_generic_args *ap)
206 {
207
208 return (0);
209 }
210
211 /*
212 * Helper function to panic on some bad VOPs in some filesystems.
213 */
214 int
vop_panic(struct vop_generic_args * ap)215 vop_panic(struct vop_generic_args *ap)
216 {
217
218 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
219 }
220
221 /*
222 * vop_std<something> and vop_no<something> are default functions for use by
223 * filesystems that need the "default reasonable" implementation for a
224 * particular operation.
225 *
226 * The documentation for the operations they implement exists (if it exists)
227 * in the VOP_<SOMETHING>(9) manpage (all uppercase).
228 */
229
230 /*
231 * Default vop for filesystems that do not support name lookup
232 */
233 static int
vop_nolookup(struct vop_lookup_args * ap)234 vop_nolookup(struct vop_lookup_args *ap)
235 {
236
237 *ap->a_vpp = NULL;
238 return (ENOTDIR);
239 }
240
241 /*
242 * vop_norename:
243 *
244 * Handle unlock and reference counting for arguments of vop_rename
245 * for filesystems that do not implement rename operation.
246 */
247 static int
vop_norename(struct vop_rename_args * ap)248 vop_norename(struct vop_rename_args *ap)
249 {
250
251 vop_rename_fail(ap);
252 return (EOPNOTSUPP);
253 }
254
255 /*
256 * vop_nostrategy:
257 *
258 * Strategy routine for VFS devices that have none.
259 *
260 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
261 * routine. Typically this is done for a BIO_READ strategy call.
262 * Typically B_INVAL is assumed to already be clear prior to a write
263 * and should not be cleared manually unless you just made the buffer
264 * invalid. BIO_ERROR should be cleared either way.
265 */
266
267 static int
vop_nostrategy(struct vop_strategy_args * ap)268 vop_nostrategy (struct vop_strategy_args *ap)
269 {
270 printf("No strategy for buffer at %p\n", ap->a_bp);
271 vn_printf(ap->a_vp, "vnode ");
272 ap->a_bp->b_ioflags |= BIO_ERROR;
273 ap->a_bp->b_error = EOPNOTSUPP;
274 bufdone(ap->a_bp);
275 return (EOPNOTSUPP);
276 }
277
278 /*
279 * Check if a named file exists in a given directory vnode
280 *
281 * Returns 0 if the file exists, ENOENT if it doesn't, or errors returned by
282 * vn_dir_next_dirent().
283 */
284 static int
dirent_exists(struct vnode * vp,const char * dirname,struct thread * td)285 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
286 {
287 char *dirbuf;
288 int error, eofflag;
289 size_t dirbuflen, len;
290 off_t off;
291 struct dirent *dp;
292 struct vattr va;
293
294 ASSERT_VOP_LOCKED(vp, "vnode not locked");
295 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
296
297 error = VOP_GETATTR(vp, &va, td->td_ucred);
298 if (error != 0)
299 return (error);
300
301 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ);
302 if (dirbuflen < va.va_blocksize)
303 dirbuflen = va.va_blocksize;
304 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK);
305
306 len = 0;
307 off = 0;
308 eofflag = 0;
309
310 for (;;) {
311 error = vn_dir_next_dirent(vp, td, dirbuf, dirbuflen,
312 &dp, &len, &off, &eofflag);
313 if (error != 0)
314 goto out;
315
316 if (len == 0)
317 break;
318
319 if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
320 strcmp(dp->d_name, dirname) == 0)
321 goto out;
322 }
323
324 error = ENOENT;
325
326 out:
327 free(dirbuf, M_TEMP);
328 return (error);
329 }
330
331 int
vop_stdaccess(struct vop_access_args * ap)332 vop_stdaccess(struct vop_access_args *ap)
333 {
334
335 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN |
336 VAPPEND)) == 0, ("invalid bit in accmode"));
337
338 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td));
339 }
340
341 int
vop_stdaccessx(struct vop_accessx_args * ap)342 vop_stdaccessx(struct vop_accessx_args *ap)
343 {
344 int error;
345 accmode_t accmode = ap->a_accmode;
346
347 error = vfs_unixify_accmode(&accmode);
348 if (error != 0)
349 return (error);
350
351 if (accmode == 0)
352 return (0);
353
354 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td));
355 }
356
357 /*
358 * Advisory record locking support
359 */
360 int
vop_stdadvlock(struct vop_advlock_args * ap)361 vop_stdadvlock(struct vop_advlock_args *ap)
362 {
363 struct vnode *vp;
364 struct mount *mp;
365 struct vattr vattr;
366 int error;
367
368 vp = ap->a_vp;
369
370 /*
371 * Provide atomicity of open(O_CREAT | O_EXCL | O_EXLOCK) for
372 * local filesystems. See vn_open_cred() for reciprocal part.
373 */
374 mp = vp->v_mount;
375 if (mp != NULL && (mp->mnt_flag & MNT_LOCAL) != 0 &&
376 ap->a_op == F_SETLK && (ap->a_flags & F_FIRSTOPEN) == 0) {
377 VI_LOCK(vp);
378 while ((vp->v_iflag & VI_FOPENING) != 0)
379 msleep(vp, VI_MTX(vp), PLOCK, "lockfo", 0);
380 VI_UNLOCK(vp);
381 }
382
383 if (ap->a_fl->l_whence == SEEK_END) {
384 /*
385 * The NFSv4 server must avoid doing a vn_lock() here, since it
386 * can deadlock the nfsd threads, due to a LOR. Fortunately
387 * the NFSv4 server always uses SEEK_SET and this code is
388 * only required for the SEEK_END case.
389 */
390 vn_lock(vp, LK_SHARED | LK_RETRY);
391 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
392 VOP_UNLOCK(vp);
393 if (error)
394 return (error);
395 } else
396 vattr.va_size = 0;
397
398 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
399 }
400
401 int
vop_stdadvlockasync(struct vop_advlockasync_args * ap)402 vop_stdadvlockasync(struct vop_advlockasync_args *ap)
403 {
404 struct vnode *vp;
405 struct vattr vattr;
406 int error;
407
408 vp = ap->a_vp;
409 if (ap->a_fl->l_whence == SEEK_END) {
410 /* The size argument is only needed for SEEK_END. */
411 vn_lock(vp, LK_SHARED | LK_RETRY);
412 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
413 VOP_UNLOCK(vp);
414 if (error)
415 return (error);
416 } else
417 vattr.va_size = 0;
418
419 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
420 }
421
422 int
vop_stdadvlockpurge(struct vop_advlockpurge_args * ap)423 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap)
424 {
425 struct vnode *vp;
426
427 vp = ap->a_vp;
428 lf_purgelocks(vp, &vp->v_lockf);
429 return (0);
430 }
431
432 /*
433 * vop_stdpathconf:
434 *
435 * Standard implementation of POSIX pathconf, to get information about limits
436 * for a filesystem.
437 * Override per filesystem for the case where the filesystem has smaller
438 * limits.
439 */
440 int
vop_stdpathconf(struct vop_pathconf_args * ap)441 vop_stdpathconf(struct vop_pathconf_args *ap)
442 {
443
444 switch (ap->a_name) {
445 case _PC_ASYNC_IO:
446 *ap->a_retval = _POSIX_ASYNCHRONOUS_IO;
447 return (0);
448 case _PC_PATH_MAX:
449 *ap->a_retval = PATH_MAX;
450 return (0);
451 case _PC_ACL_EXTENDED:
452 case _PC_ACL_NFS4:
453 case _PC_CAP_PRESENT:
454 case _PC_DEALLOC_PRESENT:
455 case _PC_INF_PRESENT:
456 case _PC_MAC_PRESENT:
457 case _PC_NAMEDATTR_ENABLED:
458 case _PC_HAS_NAMEDATTR:
459 *ap->a_retval = 0;
460 return (0);
461 default:
462 return (EINVAL);
463 }
464 /* NOTREACHED */
465 }
466
467 /*
468 * Standard lock, unlock and islocked functions.
469 */
470 int
vop_stdlock(struct vop_lock1_args * ap)471 vop_stdlock(struct vop_lock1_args *ap)
472 {
473 struct vnode *vp = ap->a_vp;
474 struct mtx *ilk;
475
476 ilk = VI_MTX(vp);
477 return (lockmgr_lock_flags(vp->v_vnlock, ap->a_flags,
478 &ilk->lock_object, ap->a_file, ap->a_line));
479 }
480
481 /* See above. */
482 int
vop_stdunlock(struct vop_unlock_args * ap)483 vop_stdunlock(struct vop_unlock_args *ap)
484 {
485 struct vnode *vp = ap->a_vp;
486
487 return (lockmgr_unlock(vp->v_vnlock));
488 }
489
490 /* See above. */
491 int
vop_stdislocked(struct vop_islocked_args * ap)492 vop_stdislocked(struct vop_islocked_args *ap)
493 {
494
495 return (lockstatus(ap->a_vp->v_vnlock));
496 }
497
498 /*
499 * Variants of the above set.
500 *
501 * Differences are:
502 * - shared locking disablement is not supported
503 * - v_vnlock pointer is not honored
504 */
505 int
vop_lock(struct vop_lock1_args * ap)506 vop_lock(struct vop_lock1_args *ap)
507 {
508 struct vnode *vp = ap->a_vp;
509 int flags = ap->a_flags;
510 struct mtx *ilk;
511
512 MPASS(vp->v_vnlock == &vp->v_lock);
513
514 if (__predict_false((flags & ~(LK_TYPE_MASK | LK_NODDLKTREAT | LK_RETRY)) != 0))
515 goto other;
516
517 switch (flags & LK_TYPE_MASK) {
518 case LK_SHARED:
519 return (lockmgr_slock(&vp->v_lock, flags, ap->a_file, ap->a_line));
520 case LK_EXCLUSIVE:
521 return (lockmgr_xlock(&vp->v_lock, flags, ap->a_file, ap->a_line));
522 }
523 other:
524 ilk = VI_MTX(vp);
525 return (lockmgr_lock_flags(&vp->v_lock, flags,
526 &ilk->lock_object, ap->a_file, ap->a_line));
527 }
528
529 int
vop_unlock(struct vop_unlock_args * ap)530 vop_unlock(struct vop_unlock_args *ap)
531 {
532 struct vnode *vp = ap->a_vp;
533
534 MPASS(vp->v_vnlock == &vp->v_lock);
535
536 return (lockmgr_unlock(&vp->v_lock));
537 }
538
539 int
vop_islocked(struct vop_islocked_args * ap)540 vop_islocked(struct vop_islocked_args *ap)
541 {
542 struct vnode *vp = ap->a_vp;
543
544 MPASS(vp->v_vnlock == &vp->v_lock);
545
546 return (lockstatus(&vp->v_lock));
547 }
548
549 /*
550 * Return true for select/poll.
551 */
552 int
vop_nopoll(struct vop_poll_args * ap)553 vop_nopoll(struct vop_poll_args *ap)
554 {
555
556 if (ap->a_events & ~POLLSTANDARD)
557 return (POLLNVAL);
558 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
559 }
560
561 /*
562 * Implement poll for local filesystems that support it.
563 */
564 int
vop_stdpoll(struct vop_poll_args * ap)565 vop_stdpoll(struct vop_poll_args *ap)
566 {
567 if (ap->a_events & ~POLLSTANDARD)
568 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
569 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
570 }
571
572 /*
573 * Return our mount point, as we will take charge of the writes.
574 */
575 int
vop_stdgetwritemount(struct vop_getwritemount_args * ap)576 vop_stdgetwritemount(struct vop_getwritemount_args *ap)
577 {
578 struct mount *mp;
579 struct vnode *vp;
580
581 /*
582 * Note that having a reference does not prevent forced unmount from
583 * setting ->v_mount to NULL after the lock gets released. This is of
584 * no consequence for typical consumers (most notably vn_start_write)
585 * since in this case the vnode is VIRF_DOOMED. Unmount might have
586 * progressed far enough that its completion is only delayed by the
587 * reference obtained here. The consumer only needs to concern itself
588 * with releasing it.
589 */
590 vp = ap->a_vp;
591 mp = vfs_ref_from_vp(vp);
592 *(ap->a_mpp) = mp;
593 return (0);
594 }
595
596 /*
597 * If the file system doesn't implement VOP_BMAP, then return sensible defaults:
598 * - Return the vnode's bufobj instead of any underlying device's bufobj
599 * - Calculate the physical block number as if there were equal size
600 * consecutive blocks, but
601 * - Report no contiguous runs of blocks.
602 */
603 int
vop_stdbmap(struct vop_bmap_args * ap)604 vop_stdbmap(struct vop_bmap_args *ap)
605 {
606
607 if (ap->a_bop != NULL)
608 *ap->a_bop = &ap->a_vp->v_bufobj;
609 if (ap->a_bnp != NULL)
610 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
611 if (ap->a_runp != NULL)
612 *ap->a_runp = 0;
613 if (ap->a_runb != NULL)
614 *ap->a_runb = 0;
615 return (0);
616 }
617
618 int
vop_stdfsync(struct vop_fsync_args * ap)619 vop_stdfsync(struct vop_fsync_args *ap)
620 {
621
622 return (vn_fsync_buf(ap->a_vp, ap->a_waitfor));
623 }
624
625 static int
vop_stdfdatasync(struct vop_fdatasync_args * ap)626 vop_stdfdatasync(struct vop_fdatasync_args *ap)
627 {
628
629 return (VOP_FSYNC(ap->a_vp, MNT_WAIT, ap->a_td));
630 }
631
632 int
vop_stdfdatasync_buf(struct vop_fdatasync_args * ap)633 vop_stdfdatasync_buf(struct vop_fdatasync_args *ap)
634 {
635
636 return (vn_fsync_buf(ap->a_vp, MNT_WAIT));
637 }
638
639 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
640 int
vop_stdgetpages(struct vop_getpages_args * ap)641 vop_stdgetpages(struct vop_getpages_args *ap)
642 {
643
644 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
645 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL);
646 }
647
648 static int
vop_stdgetpages_async(struct vop_getpages_async_args * ap)649 vop_stdgetpages_async(struct vop_getpages_async_args *ap)
650 {
651 int error;
652
653 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind,
654 ap->a_rahead);
655 if (ap->a_iodone != NULL)
656 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error);
657 return (error);
658 }
659
660 int
vop_stdkqfilter(struct vop_kqfilter_args * ap)661 vop_stdkqfilter(struct vop_kqfilter_args *ap)
662 {
663 return vfs_kqfilter(ap);
664 }
665
666 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
667 int
vop_stdputpages(struct vop_putpages_args * ap)668 vop_stdputpages(struct vop_putpages_args *ap)
669 {
670
671 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
672 ap->a_sync, ap->a_rtvals);
673 }
674
675 int
vop_stdvptofh(struct vop_vptofh_args * ap)676 vop_stdvptofh(struct vop_vptofh_args *ap)
677 {
678 return (EOPNOTSUPP);
679 }
680
681 int
vop_stdvptocnp(struct vop_vptocnp_args * ap)682 vop_stdvptocnp(struct vop_vptocnp_args *ap)
683 {
684 struct vnode *const vp = ap->a_vp;
685 struct vnode **const dvp = ap->a_vpp;
686 char *buf = ap->a_buf;
687 size_t *buflen = ap->a_buflen;
688 char *dirbuf;
689 int i = *buflen;
690 int error = 0, covered = 0;
691 int eofflag, flags, locked;
692 size_t dirbuflen, len;
693 off_t off;
694 ino_t fileno;
695 struct vattr va;
696 struct nameidata nd;
697 struct thread *const td = curthread;
698 struct ucred *const cred = td->td_ucred;
699 struct dirent *dp;
700 struct vnode *mvp;
701
702 if (vp->v_type != VDIR)
703 return (ENOENT);
704
705 error = VOP_GETATTR(vp, &va, cred);
706 if (error)
707 return (error);
708
709 VREF(vp);
710 locked = VOP_ISLOCKED(vp);
711 VOP_UNLOCK(vp);
712 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE,
713 "..", vp);
714 flags = FREAD;
715 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL);
716 if (error) {
717 vn_lock(vp, locked | LK_RETRY);
718 return (error);
719 }
720 NDFREE_PNBUF(&nd);
721
722 mvp = *dvp = nd.ni_vp;
723
724 if (vp->v_mount != (*dvp)->v_mount &&
725 ((*dvp)->v_vflag & VV_ROOT) &&
726 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) {
727 *dvp = (*dvp)->v_mount->mnt_vnodecovered;
728 VREF(mvp);
729 VOP_UNLOCK(mvp);
730 vn_close(mvp, FREAD, cred, td);
731 VREF(*dvp);
732 vn_lock(*dvp, LK_SHARED | LK_RETRY);
733 covered = 1;
734 }
735
736 fileno = va.va_fileid;
737
738 dirbuflen = MAX(DEV_BSIZE, GENERIC_MAXDIRSIZ);
739 if (dirbuflen < va.va_blocksize)
740 dirbuflen = va.va_blocksize;
741 dirbuf = malloc(dirbuflen, M_TEMP, M_WAITOK);
742
743 if ((*dvp)->v_type != VDIR) {
744 error = ENOENT;
745 goto out;
746 }
747
748 len = 0;
749 off = 0;
750 eofflag = 0;
751
752 for (;;) {
753 /* call VOP_READDIR of parent */
754 error = vn_dir_next_dirent(*dvp, td,
755 dirbuf, dirbuflen, &dp, &len, &off, &eofflag);
756 if (error != 0)
757 goto out;
758
759 if (len == 0) {
760 error = ENOENT;
761 goto out;
762 }
763
764 if ((dp->d_type != DT_WHT) &&
765 (dp->d_fileno == fileno)) {
766 if (covered) {
767 VOP_UNLOCK(*dvp);
768 vn_lock(mvp, LK_SHARED | LK_RETRY);
769 if (dirent_exists(mvp, dp->d_name, td) == 0) {
770 error = ENOENT;
771 VOP_UNLOCK(mvp);
772 vn_lock(*dvp, LK_SHARED | LK_RETRY);
773 goto out;
774 }
775 VOP_UNLOCK(mvp);
776 vn_lock(*dvp, LK_SHARED | LK_RETRY);
777 }
778 i -= dp->d_namlen;
779
780 if (i < 0) {
781 error = ENOMEM;
782 goto out;
783 }
784 if (dp->d_namlen == 1 && dp->d_name[0] == '.') {
785 error = ENOENT;
786 } else {
787 bcopy(dp->d_name, buf + i, dp->d_namlen);
788 error = 0;
789 }
790 goto out;
791 }
792 }
793
794 out:
795 free(dirbuf, M_TEMP);
796 if (!error) {
797 *buflen = i;
798 vref(*dvp);
799 }
800 if (covered) {
801 vput(*dvp);
802 vrele(mvp);
803 } else {
804 VOP_UNLOCK(mvp);
805 vn_close(mvp, FREAD, cred, td);
806 }
807 vn_lock(vp, locked | LK_RETRY);
808 return (error);
809 }
810
811 int
vop_stdallocate(struct vop_allocate_args * ap)812 vop_stdallocate(struct vop_allocate_args *ap)
813 {
814 #ifdef __notyet__
815 struct statfs *sfs;
816 off_t maxfilesize = 0;
817 #endif
818 struct iovec aiov;
819 struct vattr vattr, *vap;
820 struct uio auio;
821 off_t fsize, len, cur, offset;
822 uint8_t *buf;
823 struct thread *td;
824 struct vnode *vp;
825 size_t iosize;
826 int error;
827
828 buf = NULL;
829 error = 0;
830 td = curthread;
831 vap = &vattr;
832 vp = ap->a_vp;
833 len = *ap->a_len;
834 offset = *ap->a_offset;
835
836 error = VOP_GETATTR(vp, vap, ap->a_cred);
837 if (error != 0)
838 goto out;
839 fsize = vap->va_size;
840 iosize = vap->va_blocksize;
841 if (iosize == 0)
842 iosize = BLKDEV_IOSIZE;
843 if (iosize > maxphys)
844 iosize = maxphys;
845 buf = malloc(iosize, M_TEMP, M_WAITOK);
846
847 #ifdef __notyet__
848 /*
849 * Check if the filesystem sets f_maxfilesize; if not use
850 * VOP_SETATTR to perform the check.
851 */
852 sfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
853 error = VFS_STATFS(vp->v_mount, sfs, td);
854 if (error == 0)
855 maxfilesize = sfs->f_maxfilesize;
856 free(sfs, M_STATFS);
857 if (error != 0)
858 goto out;
859 if (maxfilesize) {
860 if (offset > maxfilesize || len > maxfilesize ||
861 offset + len > maxfilesize) {
862 error = EFBIG;
863 goto out;
864 }
865 } else
866 #endif
867 if (offset + len > vap->va_size) {
868 /*
869 * Test offset + len against the filesystem's maxfilesize.
870 */
871 VATTR_NULL(vap);
872 vap->va_size = offset + len;
873 error = VOP_SETATTR(vp, vap, ap->a_cred);
874 if (error != 0)
875 goto out;
876 VATTR_NULL(vap);
877 vap->va_size = fsize;
878 error = VOP_SETATTR(vp, vap, ap->a_cred);
879 if (error != 0)
880 goto out;
881 }
882
883 for (;;) {
884 /*
885 * Read and write back anything below the nominal file
886 * size. There's currently no way outside the filesystem
887 * to know whether this area is sparse or not.
888 */
889 cur = iosize;
890 if ((offset % iosize) != 0)
891 cur -= (offset % iosize);
892 if (cur > len)
893 cur = len;
894 if (offset < fsize) {
895 aiov.iov_base = buf;
896 aiov.iov_len = cur;
897 auio.uio_iov = &aiov;
898 auio.uio_iovcnt = 1;
899 auio.uio_offset = offset;
900 auio.uio_resid = cur;
901 auio.uio_segflg = UIO_SYSSPACE;
902 auio.uio_rw = UIO_READ;
903 auio.uio_td = td;
904 error = VOP_READ(vp, &auio, ap->a_ioflag, ap->a_cred);
905 if (error != 0)
906 break;
907 if (auio.uio_resid > 0) {
908 bzero(buf + cur - auio.uio_resid,
909 auio.uio_resid);
910 }
911 } else {
912 bzero(buf, cur);
913 }
914
915 aiov.iov_base = buf;
916 aiov.iov_len = cur;
917 auio.uio_iov = &aiov;
918 auio.uio_iovcnt = 1;
919 auio.uio_offset = offset;
920 auio.uio_resid = cur;
921 auio.uio_segflg = UIO_SYSSPACE;
922 auio.uio_rw = UIO_WRITE;
923 auio.uio_td = td;
924
925 error = VOP_WRITE(vp, &auio, ap->a_ioflag, ap->a_cred);
926 if (error != 0)
927 break;
928
929 len -= cur;
930 offset += cur;
931 if (len == 0)
932 break;
933 if (should_yield())
934 break;
935 }
936
937 out:
938 *ap->a_len = len;
939 *ap->a_offset = offset;
940 free(buf, M_TEMP);
941 return (error);
942 }
943
944 static int
vp_zerofill(struct vnode * vp,struct vattr * vap,off_t * offsetp,off_t * lenp,int ioflag,struct ucred * cred)945 vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp,
946 int ioflag, struct ucred *cred)
947 {
948 int iosize;
949 int error = 0;
950 struct iovec aiov;
951 struct uio auio;
952 struct thread *td;
953 off_t offset, len;
954
955 iosize = vap->va_blocksize;
956 td = curthread;
957 offset = *offsetp;
958 len = *lenp;
959
960 if (iosize == 0)
961 iosize = BLKDEV_IOSIZE;
962 /* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */
963 iosize = min(iosize * 8, ZERO_REGION_SIZE);
964
965 while (len > 0) {
966 int xfersize = iosize;
967 if (offset % iosize != 0)
968 xfersize -= offset % iosize;
969 if (xfersize > len)
970 xfersize = len;
971
972 aiov.iov_base = __DECONST(void *, zero_region);
973 aiov.iov_len = xfersize;
974 auio.uio_iov = &aiov;
975 auio.uio_iovcnt = 1;
976 auio.uio_offset = offset;
977 auio.uio_resid = xfersize;
978 auio.uio_segflg = UIO_SYSSPACE;
979 auio.uio_rw = UIO_WRITE;
980 auio.uio_td = td;
981
982 error = VOP_WRITE(vp, &auio, ioflag, cred);
983 if (error != 0) {
984 len -= xfersize - auio.uio_resid;
985 offset += xfersize - auio.uio_resid;
986 break;
987 }
988
989 len -= xfersize;
990 offset += xfersize;
991 }
992
993 *offsetp = offset;
994 *lenp = len;
995 return (error);
996 }
997
998 int
vop_stddeallocate(struct vop_deallocate_args * ap)999 vop_stddeallocate(struct vop_deallocate_args *ap)
1000 {
1001 struct vnode *vp;
1002 off_t offset, len;
1003 struct ucred *cred;
1004 int error;
1005 struct vattr va;
1006 off_t noff, xfersize, rem;
1007
1008 vp = ap->a_vp;
1009 offset = *ap->a_offset;
1010 cred = ap->a_cred;
1011
1012 error = VOP_GETATTR(vp, &va, cred);
1013 if (error)
1014 return (error);
1015
1016 len = omin((off_t)va.va_size - offset, *ap->a_len);
1017 while (len > 0) {
1018 noff = offset;
1019 error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred);
1020 if (error) {
1021 if (error != ENXIO)
1022 /* XXX: Is it okay to fallback further? */
1023 goto out;
1024
1025 /*
1026 * No more data region to be filled
1027 */
1028 offset += len;
1029 len = 0;
1030 error = 0;
1031 break;
1032 }
1033 KASSERT(noff >= offset, ("FIOSEEKDATA going backward"));
1034 if (noff != offset) {
1035 xfersize = omin(noff - offset, len);
1036 len -= xfersize;
1037 offset += xfersize;
1038 if (len == 0)
1039 break;
1040 }
1041 error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred);
1042 if (error)
1043 goto out;
1044
1045 /* Fill zeroes */
1046 xfersize = rem = omin(noff - offset, len);
1047 error = vp_zerofill(vp, &va, &offset, &rem, ap->a_ioflag, cred);
1048 if (error) {
1049 len -= xfersize - rem;
1050 goto out;
1051 }
1052
1053 len -= xfersize;
1054 if (should_yield())
1055 break;
1056 }
1057 /* Handle the case when offset is beyond EOF */
1058 if (len < 0)
1059 len = 0;
1060 out:
1061 *ap->a_offset = offset;
1062 *ap->a_len = len;
1063 return (error);
1064 }
1065
1066 int
vop_stdadvise(struct vop_advise_args * ap)1067 vop_stdadvise(struct vop_advise_args *ap)
1068 {
1069 struct vnode *vp;
1070 struct bufobj *bo;
1071 uintmax_t bstart, bend;
1072 daddr_t startn, endn;
1073 int bsize, error;
1074
1075 vp = ap->a_vp;
1076 switch (ap->a_advice) {
1077 case POSIX_FADV_WILLNEED:
1078 /*
1079 * Do nothing for now. Filesystems should provide a
1080 * custom method which starts an asynchronous read of
1081 * the requested region.
1082 */
1083 error = 0;
1084 break;
1085 case POSIX_FADV_DONTNEED:
1086 error = 0;
1087 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1088 if (VN_IS_DOOMED(vp)) {
1089 VOP_UNLOCK(vp);
1090 break;
1091 }
1092
1093 /*
1094 * Round to block boundaries (and later possibly further to
1095 * page boundaries). Applications cannot reasonably be aware
1096 * of the boundaries, and the rounding must be to expand at
1097 * both extremities to cover enough. It still doesn't cover
1098 * read-ahead. For partial blocks, this gives unnecessary
1099 * discarding of buffers but is efficient enough since the
1100 * pages usually remain in VMIO for some time.
1101 */
1102 bsize = vp->v_bufobj.bo_bsize;
1103 bstart = rounddown(ap->a_start, bsize);
1104 bend = ap->a_end;
1105 bend = roundup(bend, bsize);
1106
1107 /*
1108 * Deactivate pages in the specified range from the backing VM
1109 * object. Pages that are resident in the buffer cache will
1110 * remain wired until their corresponding buffers are released
1111 * below.
1112 */
1113 if (vp->v_object != NULL) {
1114 VM_OBJECT_RLOCK(vp->v_object);
1115 vm_object_page_noreuse(vp->v_object,
1116 OFF_TO_IDX(trunc_page(bstart)),
1117 OFF_TO_IDX(round_page(bend)));
1118 VM_OBJECT_RUNLOCK(vp->v_object);
1119 }
1120
1121 bo = &vp->v_bufobj;
1122 startn = bstart / bsize;
1123 endn = bend / bsize;
1124 BO_RLOCK(bo);
1125 error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
1126 if (error == 0)
1127 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);
1128 BO_RUNLOCK(bo);
1129 VOP_UNLOCK(vp);
1130 break;
1131 default:
1132 error = EINVAL;
1133 break;
1134 }
1135 return (error);
1136 }
1137
1138 int
vop_stdunp_bind(struct vop_unp_bind_args * ap)1139 vop_stdunp_bind(struct vop_unp_bind_args *ap)
1140 {
1141
1142 ap->a_vp->v_unpcb = ap->a_unpcb;
1143 return (0);
1144 }
1145
1146 int
vop_stdunp_connect(struct vop_unp_connect_args * ap)1147 vop_stdunp_connect(struct vop_unp_connect_args *ap)
1148 {
1149
1150 *ap->a_unpcb = ap->a_vp->v_unpcb;
1151 return (0);
1152 }
1153
1154 int
vop_stdunp_detach(struct vop_unp_detach_args * ap)1155 vop_stdunp_detach(struct vop_unp_detach_args *ap)
1156 {
1157
1158 ap->a_vp->v_unpcb = NULL;
1159 return (0);
1160 }
1161
1162 static int
vop_stdis_text(struct vop_is_text_args * ap)1163 vop_stdis_text(struct vop_is_text_args *ap)
1164 {
1165
1166 return ((int)atomic_load_int(&ap->a_vp->v_writecount) < 0);
1167 }
1168
1169 int
vop_stdset_text(struct vop_set_text_args * ap)1170 vop_stdset_text(struct vop_set_text_args *ap)
1171 {
1172 struct vnode *vp;
1173 int n;
1174 bool gotref;
1175
1176 vp = ap->a_vp;
1177
1178 n = atomic_load_int(&vp->v_writecount);
1179 for (;;) {
1180 if (__predict_false(n > 0)) {
1181 return (ETXTBSY);
1182 }
1183
1184 /*
1185 * Transition point, we may need to grab a reference on the vnode.
1186 *
1187 * Take the ref early As a safety measure against bogus calls
1188 * to vop_stdunset_text.
1189 */
1190 if (n == 0) {
1191 gotref = false;
1192 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) {
1193 vref(vp);
1194 gotref = true;
1195 }
1196 if (atomic_fcmpset_int(&vp->v_writecount, &n, -1)) {
1197 return (0);
1198 }
1199 if (gotref) {
1200 vunref(vp);
1201 }
1202 continue;
1203 }
1204
1205 MPASS(n < 0);
1206 if (atomic_fcmpset_int(&vp->v_writecount, &n, n - 1)) {
1207 return (0);
1208 }
1209 }
1210 __assert_unreachable();
1211 }
1212
1213 static int
vop_stdunset_text(struct vop_unset_text_args * ap)1214 vop_stdunset_text(struct vop_unset_text_args *ap)
1215 {
1216 struct vnode *vp;
1217 int n;
1218
1219 vp = ap->a_vp;
1220
1221 n = atomic_load_int(&vp->v_writecount);
1222 for (;;) {
1223 if (__predict_false(n >= 0)) {
1224 return (EINVAL);
1225 }
1226
1227 /*
1228 * Transition point, we may need to release a reference on the vnode.
1229 */
1230 if (n == -1) {
1231 if (atomic_fcmpset_int(&vp->v_writecount, &n, 0)) {
1232 if ((vn_irflag_read(vp) & VIRF_TEXT_REF) != 0) {
1233 vunref(vp);
1234 }
1235 return (0);
1236 }
1237 continue;
1238 }
1239
1240 MPASS(n < -1);
1241 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + 1)) {
1242 return (0);
1243 }
1244 }
1245 __assert_unreachable();
1246 }
1247
1248 static __always_inline int
vop_stdadd_writecount_impl(struct vop_add_writecount_args * ap,bool handle_msync)1249 vop_stdadd_writecount_impl(struct vop_add_writecount_args *ap, bool handle_msync)
1250 {
1251 struct vnode *vp;
1252 struct mount *mp __diagused;
1253 int n;
1254
1255 vp = ap->a_vp;
1256
1257 #ifdef INVARIANTS
1258 mp = vp->v_mount;
1259 if (mp != NULL) {
1260 if (handle_msync) {
1261 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) == 0, vp);
1262 } else {
1263 VNPASS((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0, vp);
1264 }
1265 }
1266 #endif
1267
1268 n = atomic_load_int(&vp->v_writecount);
1269 for (;;) {
1270 if (__predict_false(n < 0)) {
1271 return (ETXTBSY);
1272 }
1273
1274 VNASSERT(n + ap->a_inc >= 0, vp,
1275 ("neg writecount increment %d + %d = %d", n, ap->a_inc,
1276 n + ap->a_inc));
1277 if (n == 0) {
1278 if (handle_msync) {
1279 vlazy(vp);
1280 }
1281 }
1282
1283 if (atomic_fcmpset_int(&vp->v_writecount, &n, n + ap->a_inc)) {
1284 return (0);
1285 }
1286 }
1287 __assert_unreachable();
1288 }
1289
1290 int
vop_stdadd_writecount(struct vop_add_writecount_args * ap)1291 vop_stdadd_writecount(struct vop_add_writecount_args *ap)
1292 {
1293
1294 return (vop_stdadd_writecount_impl(ap, true));
1295 }
1296
1297 int
vop_stdadd_writecount_nomsync(struct vop_add_writecount_args * ap)1298 vop_stdadd_writecount_nomsync(struct vop_add_writecount_args *ap)
1299 {
1300
1301 return (vop_stdadd_writecount_impl(ap, false));
1302 }
1303
1304 int
vop_stdneed_inactive(struct vop_need_inactive_args * ap)1305 vop_stdneed_inactive(struct vop_need_inactive_args *ap)
1306 {
1307
1308 return (1);
1309 }
1310
1311 int
vop_stdinotify(struct vop_inotify_args * ap)1312 vop_stdinotify(struct vop_inotify_args *ap)
1313 {
1314 vn_inotify(ap->a_vp, ap->a_dvp, ap->a_cnp, ap->a_event, ap->a_cookie);
1315 return (0);
1316 }
1317
1318 int
vop_stdinotify_add_watch(struct vop_inotify_add_watch_args * ap)1319 vop_stdinotify_add_watch(struct vop_inotify_add_watch_args *ap)
1320 {
1321 return (vn_inotify_add_watch(ap->a_vp, ap->a_sc, ap->a_mask,
1322 ap->a_wdp, ap->a_td));
1323 }
1324
1325 int
vop_stdioctl(struct vop_ioctl_args * ap)1326 vop_stdioctl(struct vop_ioctl_args *ap)
1327 {
1328 struct vnode *vp;
1329 struct vattr va;
1330 off_t *offp;
1331 int error;
1332
1333 switch (ap->a_command) {
1334 case FIOSEEKDATA:
1335 case FIOSEEKHOLE:
1336 vp = ap->a_vp;
1337 error = vn_lock(vp, LK_SHARED);
1338 if (error != 0)
1339 return (EBADF);
1340 if (vp->v_type == VREG)
1341 error = VOP_GETATTR(vp, &va, ap->a_cred);
1342 else
1343 error = ENOTTY;
1344 if (error == 0) {
1345 offp = ap->a_data;
1346 if (*offp < 0 || *offp >= va.va_size)
1347 error = ENXIO;
1348 else if (ap->a_command == FIOSEEKHOLE)
1349 *offp = va.va_size;
1350 }
1351 VOP_UNLOCK(vp);
1352 break;
1353 default:
1354 error = ENOTTY;
1355 break;
1356 }
1357 return (error);
1358 }
1359
1360 /*
1361 * vfs default ops
1362 * used to fill the vfs function table to get reasonable default return values.
1363 */
1364 int
vfs_stdroot(struct mount * mp,int flags,struct vnode ** vpp)1365 vfs_stdroot(struct mount *mp, int flags, struct vnode **vpp)
1366 {
1367
1368 return (EOPNOTSUPP);
1369 }
1370
1371 int
vfs_stdstatfs(struct mount * mp,struct statfs * sbp)1372 vfs_stdstatfs(struct mount *mp, struct statfs *sbp)
1373 {
1374
1375 return (EOPNOTSUPP);
1376 }
1377
1378 int
vfs_stdquotactl(struct mount * mp,int cmds,uid_t uid,void * arg,bool * mp_busy)1379 vfs_stdquotactl(struct mount *mp, int cmds, uid_t uid, void *arg, bool *mp_busy)
1380 {
1381 return (EOPNOTSUPP);
1382 }
1383
1384 int
vfs_stdsync(struct mount * mp,int waitfor)1385 vfs_stdsync(struct mount *mp, int waitfor)
1386 {
1387 struct vnode *vp, *mvp;
1388 struct thread *td;
1389 int error, lockreq, allerror = 0;
1390
1391 td = curthread;
1392 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
1393 if (waitfor != MNT_WAIT)
1394 lockreq |= LK_NOWAIT;
1395 /*
1396 * Force stale buffer cache information to be flushed.
1397 */
1398 loop:
1399 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1400 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
1401 VI_UNLOCK(vp);
1402 continue;
1403 }
1404 if ((error = vget(vp, lockreq)) != 0) {
1405 if (error == ENOENT) {
1406 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1407 goto loop;
1408 }
1409 continue;
1410 }
1411 error = VOP_FSYNC(vp, waitfor, td);
1412 if (error)
1413 allerror = error;
1414 vput(vp);
1415 }
1416 return (allerror);
1417 }
1418
1419 int
vfs_stdnosync(struct mount * mp,int waitfor)1420 vfs_stdnosync(struct mount *mp, int waitfor)
1421 {
1422
1423 return (0);
1424 }
1425
1426 static int
vop_stdcopy_file_range(struct vop_copy_file_range_args * ap)1427 vop_stdcopy_file_range(struct vop_copy_file_range_args *ap)
1428 {
1429 int error;
1430
1431 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
1432 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags, ap->a_incred,
1433 ap->a_outcred, ap->a_fsizetd);
1434 return (error);
1435 }
1436
1437 int
vfs_stdvget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)1438 vfs_stdvget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
1439 {
1440
1441 return (EOPNOTSUPP);
1442 }
1443
1444 int
vfs_stdfhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)1445 vfs_stdfhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
1446 {
1447
1448 return (EOPNOTSUPP);
1449 }
1450
1451 int
vfs_stdinit(struct vfsconf * vfsp)1452 vfs_stdinit(struct vfsconf *vfsp)
1453 {
1454
1455 return (0);
1456 }
1457
1458 int
vfs_stduninit(struct vfsconf * vfsp)1459 vfs_stduninit(struct vfsconf *vfsp)
1460 {
1461
1462 return(0);
1463 }
1464
1465 int
vfs_stdextattrctl(struct mount * mp,int cmd,struct vnode * filename_vp,int attrnamespace,const char * attrname)1466 vfs_stdextattrctl(struct mount *mp, int cmd, struct vnode *filename_vp,
1467 int attrnamespace, const char *attrname)
1468 {
1469
1470 if (filename_vp != NULL)
1471 VOP_UNLOCK(filename_vp);
1472 return (EOPNOTSUPP);
1473 }
1474
1475 int
vfs_stdsysctl(struct mount * mp,fsctlop_t op,struct sysctl_req * req)1476 vfs_stdsysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
1477 {
1478
1479 return (EOPNOTSUPP);
1480 }
1481
1482 static vop_bypass_t *
bp_by_off(struct vop_vector * vop,struct vop_generic_args * a)1483 bp_by_off(struct vop_vector *vop, struct vop_generic_args *a)
1484 {
1485
1486 return (*(vop_bypass_t **)((char *)vop + a->a_desc->vdesc_vop_offset));
1487 }
1488
1489 int
vop_sigdefer(struct vop_vector * vop,struct vop_generic_args * a)1490 vop_sigdefer(struct vop_vector *vop, struct vop_generic_args *a)
1491 {
1492 vop_bypass_t *bp;
1493 int prev_stops, rc;
1494
1495 bp = bp_by_off(vop, a);
1496 MPASS(bp != NULL);
1497
1498 prev_stops = sigdeferstop(SIGDEFERSTOP_SILENT);
1499 rc = bp(a);
1500 sigallowstop(prev_stops);
1501 return (rc);
1502 }
1503
1504 static int
vop_stdstat(struct vop_stat_args * a)1505 vop_stdstat(struct vop_stat_args *a)
1506 {
1507 struct vattr vattr;
1508 struct vattr *vap;
1509 struct vnode *vp;
1510 struct stat *sb;
1511 int error;
1512 u_short mode;
1513
1514 vp = a->a_vp;
1515 sb = a->a_sb;
1516
1517 error = vop_stat_helper_pre(a);
1518 if (error != 0)
1519 return (error);
1520
1521 vap = &vattr;
1522
1523 /*
1524 * Initialize defaults for new and unusual fields, so that file
1525 * systems which don't support these fields don't need to know
1526 * about them.
1527 */
1528 vap->va_birthtime.tv_sec = -1;
1529 vap->va_birthtime.tv_nsec = 0;
1530 vap->va_fsid = VNOVAL;
1531 vap->va_gen = 0;
1532 vap->va_rdev = NODEV;
1533 vap->va_filerev = 0;
1534 vap->va_bsdflags = 0;
1535
1536 error = VOP_GETATTR(vp, vap, a->a_active_cred);
1537 if (error)
1538 goto out;
1539
1540 /*
1541 * Zero the spare stat fields
1542 */
1543 bzero(sb, sizeof *sb);
1544
1545 /*
1546 * Copy from vattr table
1547 */
1548 if (vap->va_fsid != VNOVAL)
1549 sb->st_dev = vap->va_fsid;
1550 else
1551 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
1552 sb->st_ino = vap->va_fileid;
1553 mode = vap->va_mode;
1554 switch (vap->va_type) {
1555 case VREG:
1556 mode |= S_IFREG;
1557 break;
1558 case VDIR:
1559 mode |= S_IFDIR;
1560 break;
1561 case VBLK:
1562 mode |= S_IFBLK;
1563 break;
1564 case VCHR:
1565 mode |= S_IFCHR;
1566 break;
1567 case VLNK:
1568 mode |= S_IFLNK;
1569 break;
1570 case VSOCK:
1571 mode |= S_IFSOCK;
1572 break;
1573 case VFIFO:
1574 mode |= S_IFIFO;
1575 break;
1576 default:
1577 error = EBADF;
1578 goto out;
1579 }
1580 sb->st_mode = mode;
1581 sb->st_nlink = vap->va_nlink;
1582 sb->st_uid = vap->va_uid;
1583 sb->st_gid = vap->va_gid;
1584 sb->st_rdev = vap->va_rdev;
1585 if (vap->va_size > OFF_MAX) {
1586 error = EOVERFLOW;
1587 goto out;
1588 }
1589 sb->st_size = vap->va_size;
1590 sb->st_atim.tv_sec = vap->va_atime.tv_sec;
1591 sb->st_atim.tv_nsec = vap->va_atime.tv_nsec;
1592 sb->st_mtim.tv_sec = vap->va_mtime.tv_sec;
1593 sb->st_mtim.tv_nsec = vap->va_mtime.tv_nsec;
1594 sb->st_ctim.tv_sec = vap->va_ctime.tv_sec;
1595 sb->st_ctim.tv_nsec = vap->va_ctime.tv_nsec;
1596 sb->st_birthtim.tv_sec = vap->va_birthtime.tv_sec;
1597 sb->st_birthtim.tv_nsec = vap->va_birthtime.tv_nsec;
1598
1599 /*
1600 * According to www.opengroup.org, the meaning of st_blksize is
1601 * "a filesystem-specific preferred I/O block size for this
1602 * object. In some filesystem types, this may vary from file
1603 * to file"
1604 * Use minimum/default of PAGE_SIZE (e.g. for VCHR).
1605 */
1606
1607 sb->st_blksize = max(PAGE_SIZE, vap->va_blocksize);
1608 sb->st_flags = vap->va_flags;
1609 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
1610 sb->st_gen = vap->va_gen;
1611 sb->st_filerev = vap->va_filerev;
1612 sb->st_bsdflags = vap->va_bsdflags;
1613 out:
1614 return (vop_stat_helper_post(a, error));
1615 }
1616
1617 static int
vop_stdread_pgcache(struct vop_read_pgcache_args * ap __unused)1618 vop_stdread_pgcache(struct vop_read_pgcache_args *ap __unused)
1619 {
1620 return (EJUSTRETURN);
1621 }
1622
1623 static int
vop_stdvput_pair(struct vop_vput_pair_args * ap)1624 vop_stdvput_pair(struct vop_vput_pair_args *ap)
1625 {
1626 struct vnode *dvp, *vp, **vpp;
1627
1628 dvp = ap->a_dvp;
1629 vpp = ap->a_vpp;
1630 vput(dvp);
1631 if (vpp != NULL && ap->a_unlock_vp && (vp = *vpp) != NULL)
1632 vput(vp);
1633 return (0);
1634 }
1635
1636 static int
vop_stdgetlowvnode(struct vop_getlowvnode_args * ap)1637 vop_stdgetlowvnode(struct vop_getlowvnode_args *ap)
1638 {
1639 vref(ap->a_vp);
1640 *ap->a_vplp = ap->a_vp;
1641 return (0);
1642 }
1643