1 /*-
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed
6 * to Berkeley by John Heidemann of the UCLA Ficus project.
7 *
8 * Source: * @(#)i405_init.c 2.10 92/04/27 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 * 4. 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/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bio.h>
41 #include <sys/buf.h>
42 #include <sys/conf.h>
43 #include <sys/event.h>
44 #include <sys/kernel.h>
45 #include <sys/limits.h>
46 #include <sys/lock.h>
47 #include <sys/lockf.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/namei.h>
51 #include <sys/rwlock.h>
52 #include <sys/fcntl.h>
53 #include <sys/unistd.h>
54 #include <sys/vnode.h>
55 #include <sys/dirent.h>
56 #include <sys/poll.h>
57
58 #include <security/mac/mac_framework.h>
59
60 #include <vm/vm.h>
61 #include <vm/vm_object.h>
62 #include <vm/vm_extern.h>
63 #include <vm/pmap.h>
64 #include <vm/vm_map.h>
65 #include <vm/vm_page.h>
66 #include <vm/vm_pager.h>
67 #include <vm/vnode_pager.h>
68
69 static int vop_nolookup(struct vop_lookup_args *);
70 static int vop_norename(struct vop_rename_args *);
71 static int vop_nostrategy(struct vop_strategy_args *);
72 static int get_next_dirent(struct vnode *vp, struct dirent **dpp,
73 char *dirbuf, int dirbuflen, off_t *off,
74 char **cpos, int *len, int *eofflag,
75 struct thread *td);
76 static int dirent_exists(struct vnode *vp, const char *dirname,
77 struct thread *td);
78
79 #define DIRENT_MINSIZE (sizeof(struct dirent) - (MAXNAMLEN+1) + 4)
80
81 static int vop_stdis_text(struct vop_is_text_args *ap);
82 static int vop_stdset_text(struct vop_set_text_args *ap);
83 static int vop_stdunset_text(struct vop_unset_text_args *ap);
84 static int vop_stdget_writecount(struct vop_get_writecount_args *ap);
85 static int vop_stdadd_writecount(struct vop_add_writecount_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_bmap = vop_stdbmap,
111 .vop_close = VOP_NULL,
112 .vop_fsync = VOP_NULL,
113 .vop_getpages = vop_stdgetpages,
114 .vop_getwritemount = vop_stdgetwritemount,
115 .vop_inactive = VOP_NULL,
116 .vop_ioctl = VOP_ENOTTY,
117 .vop_kqfilter = vop_stdkqfilter,
118 .vop_islocked = vop_stdislocked,
119 .vop_lock1 = vop_stdlock,
120 .vop_lookup = vop_nolookup,
121 .vop_open = VOP_NULL,
122 .vop_pathconf = VOP_EINVAL,
123 .vop_poll = vop_nopoll,
124 .vop_putpages = vop_stdputpages,
125 .vop_readlink = VOP_EINVAL,
126 .vop_rename = vop_norename,
127 .vop_revoke = VOP_PANIC,
128 .vop_strategy = vop_nostrategy,
129 .vop_unlock = vop_stdunlock,
130 .vop_vptocnp = vop_stdvptocnp,
131 .vop_vptofh = vop_stdvptofh,
132 .vop_unp_bind = vop_stdunp_bind,
133 .vop_unp_connect = vop_stdunp_connect,
134 .vop_unp_detach = vop_stdunp_detach,
135 .vop_is_text = vop_stdis_text,
136 .vop_set_text = vop_stdset_text,
137 .vop_unset_text = vop_stdunset_text,
138 .vop_get_writecount = vop_stdget_writecount,
139 .vop_add_writecount = vop_stdadd_writecount,
140 };
141
142 /*
143 * Series of placeholder functions for various error returns for
144 * VOPs.
145 */
146
147 int
148 vop_eopnotsupp(struct vop_generic_args *ap)
149 {
150 /*
151 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
152 */
153
154 return (EOPNOTSUPP);
155 }
156
157 int
158 vop_ebadf(struct vop_generic_args *ap)
159 {
160
161 return (EBADF);
162 }
163
164 int
165 vop_enotty(struct vop_generic_args *ap)
166 {
167
168 return (ENOTTY);
169 }
170
171 int
172 vop_einval(struct vop_generic_args *ap)
173 {
174
175 return (EINVAL);
176 }
177
178 int
179 vop_enoent(struct vop_generic_args *ap)
180 {
181
182 return (ENOENT);
183 }
184
185 int
186 vop_null(struct vop_generic_args *ap)
187 {
188
189 return (0);
190 }
191
192 /*
193 * Helper function to panic on some bad VOPs in some filesystems.
194 */
195 int
196 vop_panic(struct vop_generic_args *ap)
197 {
198
199 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
200 }
201
202 /*
203 * vop_std<something> and vop_no<something> are default functions for use by
204 * filesystems that need the "default reasonable" implementation for a
205 * particular operation.
206 *
207 * The documentation for the operations they implement exists (if it exists)
208 * in the VOP_<SOMETHING>(9) manpage (all uppercase).
209 */
210
211 /*
212 * Default vop for filesystems that do not support name lookup
213 */
214 static int
215 vop_nolookup(ap)
216 struct vop_lookup_args /* {
217 struct vnode *a_dvp;
218 struct vnode **a_vpp;
219 struct componentname *a_cnp;
220 } */ *ap;
221 {
222
223 *ap->a_vpp = NULL;
224 return (ENOTDIR);
225 }
226
227 /*
228 * vop_norename:
229 *
230 * Handle unlock and reference counting for arguments of vop_rename
231 * for filesystems that do not implement rename operation.
232 */
233 static int
234 vop_norename(struct vop_rename_args *ap)
235 {
236
237 vop_rename_fail(ap);
238 return (EOPNOTSUPP);
239 }
240
241 /*
242 * vop_nostrategy:
243 *
244 * Strategy routine for VFS devices that have none.
245 *
246 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
247 * routine. Typically this is done for a BIO_READ strategy call.
248 * Typically B_INVAL is assumed to already be clear prior to a write
249 * and should not be cleared manually unless you just made the buffer
250 * invalid. BIO_ERROR should be cleared either way.
251 */
252
253 static int
254 vop_nostrategy (struct vop_strategy_args *ap)
255 {
256 printf("No strategy for buffer at %p\n", ap->a_bp);
257 vprint("vnode", ap->a_vp);
258 ap->a_bp->b_ioflags |= BIO_ERROR;
259 ap->a_bp->b_error = EOPNOTSUPP;
260 bufdone(ap->a_bp);
261 return (EOPNOTSUPP);
262 }
263
264 static int
265 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf,
266 int dirbuflen, off_t *off, char **cpos, int *len,
267 int *eofflag, struct thread *td)
268 {
269 int error, reclen;
270 struct uio uio;
271 struct iovec iov;
272 struct dirent *dp;
273
274 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
275 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
276
277 if (*len == 0) {
278 iov.iov_base = dirbuf;
279 iov.iov_len = dirbuflen;
280
281 uio.uio_iov = &iov;
282 uio.uio_iovcnt = 1;
283 uio.uio_offset = *off;
284 uio.uio_resid = dirbuflen;
285 uio.uio_segflg = UIO_SYSSPACE;
286 uio.uio_rw = UIO_READ;
287 uio.uio_td = td;
288
289 *eofflag = 0;
290
291 #ifdef MAC
292 error = mac_vnode_check_readdir(td->td_ucred, vp);
293 if (error == 0)
294 #endif
295 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag,
296 NULL, NULL);
297 if (error)
298 return (error);
299
300 *off = uio.uio_offset;
301
302 *cpos = dirbuf;
303 *len = (dirbuflen - uio.uio_resid);
304
305 if (*len == 0)
306 return (ENOENT);
307 }
308
309 dp = (struct dirent *)(*cpos);
310 reclen = dp->d_reclen;
311 *dpp = dp;
312
313 /* check for malformed directory.. */
314 if (reclen < DIRENT_MINSIZE)
315 return (EINVAL);
316
317 *cpos += reclen;
318 *len -= reclen;
319
320 return (0);
321 }
322
323 /*
324 * Check if a named file exists in a given directory vnode.
325 */
326 static int
327 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
328 {
329 char *dirbuf, *cpos;
330 int error, eofflag, dirbuflen, len, found;
331 off_t off;
332 struct dirent *dp;
333 struct vattr va;
334
335 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
336 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
337
338 found = 0;
339
340 error = VOP_GETATTR(vp, &va, td->td_ucred);
341 if (error)
342 return (found);
343
344 dirbuflen = DEV_BSIZE;
345 if (dirbuflen < va.va_blocksize)
346 dirbuflen = va.va_blocksize;
347 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
348
349 off = 0;
350 len = 0;
351 do {
352 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off,
353 &cpos, &len, &eofflag, td);
354 if (error)
355 goto out;
356
357 if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
358 strcmp(dp->d_name, dirname) == 0) {
359 found = 1;
360 goto out;
361 }
362 } while (len > 0 || !eofflag);
363
364 out:
365 free(dirbuf, M_TEMP);
366 return (found);
367 }
368
369 int
370 vop_stdaccess(struct vop_access_args *ap)
371 {
372
373 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN |
374 VAPPEND)) == 0, ("invalid bit in accmode"));
375
376 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td));
377 }
378
379 int
380 vop_stdaccessx(struct vop_accessx_args *ap)
381 {
382 int error;
383 accmode_t accmode = ap->a_accmode;
384
385 error = vfs_unixify_accmode(&accmode);
386 if (error != 0)
387 return (error);
388
389 if (accmode == 0)
390 return (0);
391
392 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td));
393 }
394
395 /*
396 * Advisory record locking support
397 */
398 int
399 vop_stdadvlock(struct vop_advlock_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 /*
408 * The NFSv4 server must avoid doing a vn_lock() here, since it
409 * can deadlock the nfsd threads, due to a LOR. Fortunately
410 * the NFSv4 server always uses SEEK_SET and this code is
411 * only required for the SEEK_END case.
412 */
413 vn_lock(vp, LK_SHARED | LK_RETRY);
414 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
415 VOP_UNLOCK(vp, 0);
416 if (error)
417 return (error);
418 } else
419 vattr.va_size = 0;
420
421 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
422 }
423
424 int
425 vop_stdadvlockasync(struct vop_advlockasync_args *ap)
426 {
427 struct vnode *vp;
428 struct vattr vattr;
429 int error;
430
431 vp = ap->a_vp;
432 if (ap->a_fl->l_whence == SEEK_END) {
433 /* The size argument is only needed for SEEK_END. */
434 vn_lock(vp, LK_SHARED | LK_RETRY);
435 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
436 VOP_UNLOCK(vp, 0);
437 if (error)
438 return (error);
439 } else
440 vattr.va_size = 0;
441
442 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
443 }
444
445 int
446 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap)
447 {
448 struct vnode *vp;
449
450 vp = ap->a_vp;
451 lf_purgelocks(vp, &vp->v_lockf);
452 return (0);
453 }
454
455 /*
456 * vop_stdpathconf:
457 *
458 * Standard implementation of POSIX pathconf, to get information about limits
459 * for a filesystem.
460 * Override per filesystem for the case where the filesystem has smaller
461 * limits.
462 */
463 int
464 vop_stdpathconf(ap)
465 struct vop_pathconf_args /* {
466 struct vnode *a_vp;
467 int a_name;
468 int *a_retval;
469 } */ *ap;
470 {
471
472 switch (ap->a_name) {
473 case _PC_NAME_MAX:
474 *ap->a_retval = NAME_MAX;
475 return (0);
476 case _PC_PATH_MAX:
477 *ap->a_retval = PATH_MAX;
478 return (0);
479 case _PC_LINK_MAX:
480 *ap->a_retval = LINK_MAX;
481 return (0);
482 case _PC_MAX_CANON:
483 *ap->a_retval = MAX_CANON;
484 return (0);
485 case _PC_MAX_INPUT:
486 *ap->a_retval = MAX_INPUT;
487 return (0);
488 case _PC_PIPE_BUF:
489 *ap->a_retval = PIPE_BUF;
490 return (0);
491 case _PC_CHOWN_RESTRICTED:
492 *ap->a_retval = 1;
493 return (0);
494 case _PC_VDISABLE:
495 *ap->a_retval = _POSIX_VDISABLE;
496 return (0);
497 default:
498 return (EINVAL);
499 }
500 /* NOTREACHED */
501 }
502
503 /*
504 * Standard lock, unlock and islocked functions.
505 */
506 int
507 vop_stdlock(ap)
508 struct vop_lock1_args /* {
509 struct vnode *a_vp;
510 int a_flags;
511 char *file;
512 int line;
513 } */ *ap;
514 {
515 struct vnode *vp = ap->a_vp;
516
517 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
518 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
519 ap->a_line));
520 }
521
522 /* See above. */
523 int
524 vop_stdunlock(ap)
525 struct vop_unlock_args /* {
526 struct vnode *a_vp;
527 int a_flags;
528 } */ *ap;
529 {
530 struct vnode *vp = ap->a_vp;
531
532 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp)));
533 }
534
535 /* See above. */
536 int
537 vop_stdislocked(ap)
538 struct vop_islocked_args /* {
539 struct vnode *a_vp;
540 } */ *ap;
541 {
542
543 return (lockstatus(ap->a_vp->v_vnlock));
544 }
545
546 /*
547 * Return true for select/poll.
548 */
549 int
550 vop_nopoll(ap)
551 struct vop_poll_args /* {
552 struct vnode *a_vp;
553 int a_events;
554 struct ucred *a_cred;
555 struct thread *a_td;
556 } */ *ap;
557 {
558
559 return (poll_no_poll(ap->a_events));
560 }
561
562 /*
563 * Implement poll for local filesystems that support it.
564 */
565 int
566 vop_stdpoll(ap)
567 struct vop_poll_args /* {
568 struct vnode *a_vp;
569 int a_events;
570 struct ucred *a_cred;
571 struct thread *a_td;
572 } */ *ap;
573 {
574 if (ap->a_events & ~POLLSTANDARD)
575 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
576 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
577 }
578
579 /*
580 * Return our mount point, as we will take charge of the writes.
581 */
582 int
583 vop_stdgetwritemount(ap)
584 struct vop_getwritemount_args /* {
585 struct vnode *a_vp;
586 struct mount **a_mpp;
587 } */ *ap;
588 {
589 struct mount *mp;
590
591 /*
592 * XXX Since this is called unlocked we may be recycled while
593 * attempting to ref the mount. If this is the case or mountpoint
594 * will be set to NULL. We only have to prevent this call from
595 * returning with a ref to an incorrect mountpoint. It is not
596 * harmful to return with a ref to our previous mountpoint.
597 */
598 mp = ap->a_vp->v_mount;
599 if (mp != NULL) {
600 vfs_ref(mp);
601 if (mp != ap->a_vp->v_mount) {
602 vfs_rel(mp);
603 mp = NULL;
604 }
605 }
606 *(ap->a_mpp) = mp;
607 return (0);
608 }
609
610 /* XXX Needs good comment and VOP_BMAP(9) manpage */
611 int
612 vop_stdbmap(ap)
613 struct vop_bmap_args /* {
614 struct vnode *a_vp;
615 daddr_t a_bn;
616 struct bufobj **a_bop;
617 daddr_t *a_bnp;
618 int *a_runp;
619 int *a_runb;
620 } */ *ap;
621 {
622
623 if (ap->a_bop != NULL)
624 *ap->a_bop = &ap->a_vp->v_bufobj;
625 if (ap->a_bnp != NULL)
626 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
627 if (ap->a_runp != NULL)
628 *ap->a_runp = 0;
629 if (ap->a_runb != NULL)
630 *ap->a_runb = 0;
631 return (0);
632 }
633
634 int
635 vop_stdfsync(ap)
636 struct vop_fsync_args /* {
637 struct vnode *a_vp;
638 int a_waitfor;
639 struct thread *a_td;
640 } */ *ap;
641 {
642 struct vnode *vp;
643 struct buf *bp, *nbp;
644 struct bufobj *bo;
645 struct mount *mp;
646 int error, maxretry;
647
648 error = 0;
649 maxretry = 10000; /* large, arbitrarily chosen */
650 vp = ap->a_vp;
651 mp = NULL;
652 if (vp->v_type == VCHR) {
653 VI_LOCK(vp);
654 mp = vp->v_rdev->si_mountpt;
655 VI_UNLOCK(vp);
656 }
657 bo = &vp->v_bufobj;
658 BO_LOCK(bo);
659 loop1:
660 /*
661 * MARK/SCAN initialization to avoid infinite loops.
662 */
663 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
664 bp->b_vflags &= ~BV_SCANNED;
665 bp->b_error = 0;
666 }
667
668 /*
669 * Flush all dirty buffers associated with a vnode.
670 */
671 loop2:
672 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
673 if ((bp->b_vflags & BV_SCANNED) != 0)
674 continue;
675 bp->b_vflags |= BV_SCANNED;
676 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
677 if (ap->a_waitfor != MNT_WAIT)
678 continue;
679 if (BUF_LOCK(bp,
680 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL,
681 BO_LOCKPTR(bo)) != 0) {
682 BO_LOCK(bo);
683 goto loop1;
684 }
685 BO_LOCK(bo);
686 }
687 BO_UNLOCK(bo);
688 KASSERT(bp->b_bufobj == bo,
689 ("bp %p wrong b_bufobj %p should be %p",
690 bp, bp->b_bufobj, bo));
691 if ((bp->b_flags & B_DELWRI) == 0)
692 panic("fsync: not dirty");
693 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
694 vfs_bio_awrite(bp);
695 } else {
696 bremfree(bp);
697 bawrite(bp);
698 }
699 if (maxretry < 1000)
700 pause("dirty", hz < 1000 ? 1 : hz / 1000);
701 BO_LOCK(bo);
702 goto loop2;
703 }
704
705 /*
706 * If synchronous the caller expects us to completely resolve all
707 * dirty buffers in the system. Wait for in-progress I/O to
708 * complete (which could include background bitmap writes), then
709 * retry if dirty blocks still exist.
710 */
711 if (ap->a_waitfor == MNT_WAIT) {
712 bufobj_wwait(bo, 0, 0);
713 if (bo->bo_dirty.bv_cnt > 0) {
714 /*
715 * If we are unable to write any of these buffers
716 * then we fail now rather than trying endlessly
717 * to write them out.
718 */
719 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
720 if ((error = bp->b_error) == 0)
721 continue;
722 if ((mp != NULL && mp->mnt_secondary_writes > 0) ||
723 (error == 0 && --maxretry >= 0))
724 goto loop1;
725 if (error == 0)
726 error = EAGAIN;
727 }
728 }
729 BO_UNLOCK(bo);
730 if (error != 0)
731 vn_printf(vp, "fsync: giving up on dirty (error = %d) ", error);
732
733 return (error);
734 }
735
736 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
737 int
738 vop_stdgetpages(ap)
739 struct vop_getpages_args /* {
740 struct vnode *a_vp;
741 vm_page_t *a_m;
742 int a_count;
743 int a_reqpage;
744 vm_ooffset_t a_offset;
745 } */ *ap;
746 {
747
748 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
749 ap->a_count, ap->a_reqpage);
750 }
751
752 int
753 vop_stdkqfilter(struct vop_kqfilter_args *ap)
754 {
755 return vfs_kqfilter(ap);
756 }
757
758 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
759 int
760 vop_stdputpages(ap)
761 struct vop_putpages_args /* {
762 struct vnode *a_vp;
763 vm_page_t *a_m;
764 int a_count;
765 int a_sync;
766 int *a_rtvals;
767 vm_ooffset_t a_offset;
768 } */ *ap;
769 {
770
771 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
772 ap->a_sync, ap->a_rtvals);
773 }
774
775 int
776 vop_stdvptofh(struct vop_vptofh_args *ap)
777 {
778 return (EOPNOTSUPP);
779 }
780
781 int
782 vop_stdvptocnp(struct vop_vptocnp_args *ap)
783 {
784 struct vnode *vp = ap->a_vp;
785 struct vnode **dvp = ap->a_vpp;
786 struct ucred *cred = ap->a_cred;
787 char *buf = ap->a_buf;
788 int *buflen = ap->a_buflen;
789 char *dirbuf, *cpos;
790 int i, error, eofflag, dirbuflen, flags, locked, len, covered;
791 off_t off;
792 ino_t fileno;
793 struct vattr va;
794 struct nameidata nd;
795 struct thread *td;
796 struct dirent *dp;
797 struct vnode *mvp;
798
799 i = *buflen;
800 error = 0;
801 covered = 0;
802 td = curthread;
803
804 if (vp->v_type != VDIR)
805 return (ENOENT);
806
807 error = VOP_GETATTR(vp, &va, cred);
808 if (error)
809 return (error);
810
811 VREF(vp);
812 locked = VOP_ISLOCKED(vp);
813 VOP_UNLOCK(vp, 0);
814 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE,
815 "..", vp, td);
816 flags = FREAD;
817 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL);
818 if (error) {
819 vn_lock(vp, locked | LK_RETRY);
820 return (error);
821 }
822 NDFREE(&nd, NDF_ONLY_PNBUF);
823
824 mvp = *dvp = nd.ni_vp;
825
826 if (vp->v_mount != (*dvp)->v_mount &&
827 ((*dvp)->v_vflag & VV_ROOT) &&
828 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) {
829 *dvp = (*dvp)->v_mount->mnt_vnodecovered;
830 VREF(mvp);
831 VOP_UNLOCK(mvp, 0);
832 vn_close(mvp, FREAD, cred, td);
833 VREF(*dvp);
834 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY);
835 covered = 1;
836 }
837
838 fileno = va.va_fileid;
839
840 dirbuflen = DEV_BSIZE;
841 if (dirbuflen < va.va_blocksize)
842 dirbuflen = va.va_blocksize;
843 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
844
845 if ((*dvp)->v_type != VDIR) {
846 error = ENOENT;
847 goto out;
848 }
849
850 off = 0;
851 len = 0;
852 do {
853 /* call VOP_READDIR of parent */
854 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off,
855 &cpos, &len, &eofflag, td);
856 if (error)
857 goto out;
858
859 if ((dp->d_type != DT_WHT) &&
860 (dp->d_fileno == fileno)) {
861 if (covered) {
862 VOP_UNLOCK(*dvp, 0);
863 vn_lock(mvp, LK_EXCLUSIVE | LK_RETRY);
864 if (dirent_exists(mvp, dp->d_name, td)) {
865 error = ENOENT;
866 VOP_UNLOCK(mvp, 0);
867 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY);
868 goto out;
869 }
870 VOP_UNLOCK(mvp, 0);
871 vn_lock(*dvp, LK_EXCLUSIVE | LK_RETRY);
872 }
873 i -= dp->d_namlen;
874
875 if (i < 0) {
876 error = ENOMEM;
877 goto out;
878 }
879 if (dp->d_namlen == 1 && dp->d_name[0] == '.') {
880 error = ENOENT;
881 } else {
882 bcopy(dp->d_name, buf + i, dp->d_namlen);
883 error = 0;
884 }
885 goto out;
886 }
887 } while (len > 0 || !eofflag);
888 error = ENOENT;
889
890 out:
891 free(dirbuf, M_TEMP);
892 if (!error) {
893 *buflen = i;
894 vref(*dvp);
895 }
896 if (covered) {
897 vput(*dvp);
898 vrele(mvp);
899 } else {
900 VOP_UNLOCK(mvp, 0);
901 vn_close(mvp, FREAD, cred, td);
902 }
903 vn_lock(vp, locked | LK_RETRY);
904 return (error);
905 }
906
907 int
908 vop_stdallocate(struct vop_allocate_args *ap)
909 {
910 #ifdef __notyet__
911 struct statfs sfs;
912 #endif
913 struct iovec aiov;
914 struct vattr vattr, *vap;
915 struct uio auio;
916 off_t fsize, len, cur, offset;
917 uint8_t *buf;
918 struct thread *td;
919 struct vnode *vp;
920 size_t iosize;
921 int error;
922
923 buf = NULL;
924 error = 0;
925 td = curthread;
926 vap = &vattr;
927 vp = ap->a_vp;
928 len = *ap->a_len;
929 offset = *ap->a_offset;
930
931 error = VOP_GETATTR(vp, vap, td->td_ucred);
932 if (error != 0)
933 goto out;
934 fsize = vap->va_size;
935 iosize = vap->va_blocksize;
936 if (iosize == 0)
937 iosize = BLKDEV_IOSIZE;
938 if (iosize > MAXPHYS)
939 iosize = MAXPHYS;
940 buf = malloc(iosize, M_TEMP, M_WAITOK);
941
942 #ifdef __notyet__
943 /*
944 * Check if the filesystem sets f_maxfilesize; if not use
945 * VOP_SETATTR to perform the check.
946 */
947 error = VFS_STATFS(vp->v_mount, &sfs, td);
948 if (error != 0)
949 goto out;
950 if (sfs.f_maxfilesize) {
951 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize ||
952 offset + len > sfs.f_maxfilesize) {
953 error = EFBIG;
954 goto out;
955 }
956 } else
957 #endif
958 if (offset + len > vap->va_size) {
959 /*
960 * Test offset + len against the filesystem's maxfilesize.
961 */
962 VATTR_NULL(vap);
963 vap->va_size = offset + len;
964 error = VOP_SETATTR(vp, vap, td->td_ucred);
965 if (error != 0)
966 goto out;
967 VATTR_NULL(vap);
968 vap->va_size = fsize;
969 error = VOP_SETATTR(vp, vap, td->td_ucred);
970 if (error != 0)
971 goto out;
972 }
973
974 for (;;) {
975 /*
976 * Read and write back anything below the nominal file
977 * size. There's currently no way outside the filesystem
978 * to know whether this area is sparse or not.
979 */
980 cur = iosize;
981 if ((offset % iosize) != 0)
982 cur -= (offset % iosize);
983 if (cur > len)
984 cur = len;
985 if (offset < fsize) {
986 aiov.iov_base = buf;
987 aiov.iov_len = cur;
988 auio.uio_iov = &aiov;
989 auio.uio_iovcnt = 1;
990 auio.uio_offset = offset;
991 auio.uio_resid = cur;
992 auio.uio_segflg = UIO_SYSSPACE;
993 auio.uio_rw = UIO_READ;
994 auio.uio_td = td;
995 error = VOP_READ(vp, &auio, 0, td->td_ucred);
996 if (error != 0)
997 break;
998 if (auio.uio_resid > 0) {
999 bzero(buf + cur - auio.uio_resid,
1000 auio.uio_resid);
1001 }
1002 } else {
1003 bzero(buf, cur);
1004 }
1005
1006 aiov.iov_base = buf;
1007 aiov.iov_len = cur;
1008 auio.uio_iov = &aiov;
1009 auio.uio_iovcnt = 1;
1010 auio.uio_offset = offset;
1011 auio.uio_resid = cur;
1012 auio.uio_segflg = UIO_SYSSPACE;
1013 auio.uio_rw = UIO_WRITE;
1014 auio.uio_td = td;
1015
1016 error = VOP_WRITE(vp, &auio, 0, td->td_ucred);
1017 if (error != 0)
1018 break;
1019
1020 len -= cur;
1021 offset += cur;
1022 if (len == 0)
1023 break;
1024 if (should_yield())
1025 break;
1026 }
1027
1028 out:
1029 *ap->a_len = len;
1030 *ap->a_offset = offset;
1031 free(buf, M_TEMP);
1032 return (error);
1033 }
1034
1035 int
1036 vop_stdadvise(struct vop_advise_args *ap)
1037 {
1038 struct vnode *vp;
1039 off_t start, end;
1040 int error;
1041
1042 vp = ap->a_vp;
1043 switch (ap->a_advice) {
1044 case POSIX_FADV_WILLNEED:
1045 /*
1046 * Do nothing for now. Filesystems should provide a
1047 * custom method which starts an asynchronous read of
1048 * the requested region.
1049 */
1050 error = 0;
1051 break;
1052 case POSIX_FADV_DONTNEED:
1053 /*
1054 * Flush any open FS buffers and then remove pages
1055 * from the backing VM object. Using vinvalbuf() here
1056 * is a bit heavy-handed as it flushes all buffers for
1057 * the given vnode, not just the buffers covering the
1058 * requested range.
1059 */
1060 error = 0;
1061 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1062 if (vp->v_iflag & VI_DOOMED) {
1063 VOP_UNLOCK(vp, 0);
1064 break;
1065 }
1066 vinvalbuf(vp, V_CLEANONLY, 0, 0);
1067 if (vp->v_object != NULL) {
1068 start = trunc_page(ap->a_start);
1069 end = round_page(ap->a_end);
1070 VM_OBJECT_WLOCK(vp->v_object);
1071 vm_object_page_cache(vp->v_object, OFF_TO_IDX(start),
1072 OFF_TO_IDX(end));
1073 VM_OBJECT_WUNLOCK(vp->v_object);
1074 }
1075 VOP_UNLOCK(vp, 0);
1076 break;
1077 default:
1078 error = EINVAL;
1079 break;
1080 }
1081 return (error);
1082 }
1083
1084 int
1085 vop_stdunp_bind(struct vop_unp_bind_args *ap)
1086 {
1087
1088 ap->a_vp->v_socket = ap->a_socket;
1089 return (0);
1090 }
1091
1092 int
1093 vop_stdunp_connect(struct vop_unp_connect_args *ap)
1094 {
1095
1096 *ap->a_socket = ap->a_vp->v_socket;
1097 return (0);
1098 }
1099
1100 int
1101 vop_stdunp_detach(struct vop_unp_detach_args *ap)
1102 {
1103
1104 ap->a_vp->v_socket = NULL;
1105 return (0);
1106 }
1107
1108 static int
1109 vop_stdis_text(struct vop_is_text_args *ap)
1110 {
1111
1112 return ((ap->a_vp->v_vflag & VV_TEXT) != 0);
1113 }
1114
1115 static int
1116 vop_stdset_text(struct vop_set_text_args *ap)
1117 {
1118
1119 ap->a_vp->v_vflag |= VV_TEXT;
1120 return (0);
1121 }
1122
1123 static int
1124 vop_stdunset_text(struct vop_unset_text_args *ap)
1125 {
1126
1127 ap->a_vp->v_vflag &= ~VV_TEXT;
1128 return (0);
1129 }
1130
1131 static int
1132 vop_stdget_writecount(struct vop_get_writecount_args *ap)
1133 {
1134
1135 *ap->a_writecount = ap->a_vp->v_writecount;
1136 return (0);
1137 }
1138
1139 static int
1140 vop_stdadd_writecount(struct vop_add_writecount_args *ap)
1141 {
1142
1143 ap->a_vp->v_writecount += ap->a_inc;
1144 return (0);
1145 }
1146
1147 /*
1148 * vfs default ops
1149 * used to fill the vfs function table to get reasonable default return values.
1150 */
1151 int
1152 vfs_stdroot (mp, flags, vpp)
1153 struct mount *mp;
1154 int flags;
1155 struct vnode **vpp;
1156 {
1157
1158 return (EOPNOTSUPP);
1159 }
1160
1161 int
1162 vfs_stdstatfs (mp, sbp)
1163 struct mount *mp;
1164 struct statfs *sbp;
1165 {
1166
1167 return (EOPNOTSUPP);
1168 }
1169
1170 int
1171 vfs_stdquotactl (mp, cmds, uid, arg)
1172 struct mount *mp;
1173 int cmds;
1174 uid_t uid;
1175 void *arg;
1176 {
1177
1178 return (EOPNOTSUPP);
1179 }
1180
1181 int
1182 vfs_stdsync(mp, waitfor)
1183 struct mount *mp;
1184 int waitfor;
1185 {
1186 struct vnode *vp, *mvp;
1187 struct thread *td;
1188 int error, lockreq, allerror = 0;
1189
1190 td = curthread;
1191 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
1192 if (waitfor != MNT_WAIT)
1193 lockreq |= LK_NOWAIT;
1194 /*
1195 * Force stale buffer cache information to be flushed.
1196 */
1197 loop:
1198 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1199 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
1200 VI_UNLOCK(vp);
1201 continue;
1202 }
1203 if ((error = vget(vp, lockreq, td)) != 0) {
1204 if (error == ENOENT) {
1205 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1206 goto loop;
1207 }
1208 continue;
1209 }
1210 error = VOP_FSYNC(vp, waitfor, td);
1211 if (error)
1212 allerror = error;
1213 vput(vp);
1214 }
1215 return (allerror);
1216 }
1217
1218 int
1219 vfs_stdnosync (mp, waitfor)
1220 struct mount *mp;
1221 int waitfor;
1222 {
1223
1224 return (0);
1225 }
1226
1227 int
1228 vfs_stdvget (mp, ino, flags, vpp)
1229 struct mount *mp;
1230 ino_t ino;
1231 int flags;
1232 struct vnode **vpp;
1233 {
1234
1235 return (EOPNOTSUPP);
1236 }
1237
1238 int
1239 vfs_stdfhtovp (mp, fhp, flags, vpp)
1240 struct mount *mp;
1241 struct fid *fhp;
1242 int flags;
1243 struct vnode **vpp;
1244 {
1245
1246 return (EOPNOTSUPP);
1247 }
1248
1249 int
1250 vfs_stdinit (vfsp)
1251 struct vfsconf *vfsp;
1252 {
1253
1254 return (0);
1255 }
1256
1257 int
1258 vfs_stduninit (vfsp)
1259 struct vfsconf *vfsp;
1260 {
1261
1262 return(0);
1263 }
1264
1265 int
1266 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname)
1267 struct mount *mp;
1268 int cmd;
1269 struct vnode *filename_vp;
1270 int attrnamespace;
1271 const char *attrname;
1272 {
1273
1274 if (filename_vp != NULL)
1275 VOP_UNLOCK(filename_vp, 0);
1276 return (EOPNOTSUPP);
1277 }
1278
1279 int
1280 vfs_stdsysctl(mp, op, req)
1281 struct mount *mp;
1282 fsctlop_t op;
1283 struct sysctl_req *req;
1284 {
1285
1286 return (EOPNOTSUPP);
1287 }
1288
1289 /* end of vfs default ops */
Cache object: 4b602868e9770a8a16e60efef2e53672
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