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 static int vop_stdgetpages_async(struct vop_getpages_async_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_bmap = vop_stdbmap,
112 .vop_close = VOP_NULL,
113 .vop_fsync = VOP_NULL,
114 .vop_getpages = vop_stdgetpages,
115 .vop_getpages_async = vop_stdgetpages_async,
116 .vop_getwritemount = vop_stdgetwritemount,
117 .vop_inactive = VOP_NULL,
118 .vop_ioctl = VOP_ENOTTY,
119 .vop_kqfilter = vop_stdkqfilter,
120 .vop_islocked = vop_stdislocked,
121 .vop_lock1 = vop_stdlock,
122 .vop_lookup = vop_nolookup,
123 .vop_open = VOP_NULL,
124 .vop_pathconf = VOP_EINVAL,
125 .vop_poll = vop_nopoll,
126 .vop_putpages = vop_stdputpages,
127 .vop_readlink = VOP_EINVAL,
128 .vop_rename = vop_norename,
129 .vop_revoke = VOP_PANIC,
130 .vop_strategy = vop_nostrategy,
131 .vop_unlock = vop_stdunlock,
132 .vop_vptocnp = vop_stdvptocnp,
133 .vop_vptofh = vop_stdvptofh,
134 .vop_unp_bind = vop_stdunp_bind,
135 .vop_unp_connect = vop_stdunp_connect,
136 .vop_unp_detach = vop_stdunp_detach,
137 .vop_is_text = vop_stdis_text,
138 .vop_set_text = vop_stdset_text,
139 .vop_unset_text = vop_stdunset_text,
140 .vop_get_writecount = vop_stdget_writecount,
141 .vop_add_writecount = vop_stdadd_writecount,
142 };
143
144 /*
145 * Series of placeholder functions for various error returns for
146 * VOPs.
147 */
148
149 int
vop_eopnotsupp(struct vop_generic_args * ap)150 vop_eopnotsupp(struct vop_generic_args *ap)
151 {
152 /*
153 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
154 */
155
156 return (EOPNOTSUPP);
157 }
158
159 int
vop_ebadf(struct vop_generic_args * ap)160 vop_ebadf(struct vop_generic_args *ap)
161 {
162
163 return (EBADF);
164 }
165
166 int
vop_enotty(struct vop_generic_args * ap)167 vop_enotty(struct vop_generic_args *ap)
168 {
169
170 return (ENOTTY);
171 }
172
173 int
vop_einval(struct vop_generic_args * ap)174 vop_einval(struct vop_generic_args *ap)
175 {
176
177 return (EINVAL);
178 }
179
180 int
vop_enoent(struct vop_generic_args * ap)181 vop_enoent(struct vop_generic_args *ap)
182 {
183
184 return (ENOENT);
185 }
186
187 int
vop_null(struct vop_generic_args * ap)188 vop_null(struct vop_generic_args *ap)
189 {
190
191 return (0);
192 }
193
194 /*
195 * Helper function to panic on some bad VOPs in some filesystems.
196 */
197 int
vop_panic(struct vop_generic_args * ap)198 vop_panic(struct vop_generic_args *ap)
199 {
200
201 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
202 }
203
204 /*
205 * vop_std<something> and vop_no<something> are default functions for use by
206 * filesystems that need the "default reasonable" implementation for a
207 * particular operation.
208 *
209 * The documentation for the operations they implement exists (if it exists)
210 * in the VOP_<SOMETHING>(9) manpage (all uppercase).
211 */
212
213 /*
214 * Default vop for filesystems that do not support name lookup
215 */
216 static int
vop_nolookup(ap)217 vop_nolookup(ap)
218 struct vop_lookup_args /* {
219 struct vnode *a_dvp;
220 struct vnode **a_vpp;
221 struct componentname *a_cnp;
222 } */ *ap;
223 {
224
225 *ap->a_vpp = NULL;
226 return (ENOTDIR);
227 }
228
229 /*
230 * vop_norename:
231 *
232 * Handle unlock and reference counting for arguments of vop_rename
233 * for filesystems that do not implement rename operation.
234 */
235 static int
vop_norename(struct vop_rename_args * ap)236 vop_norename(struct vop_rename_args *ap)
237 {
238
239 vop_rename_fail(ap);
240 return (EOPNOTSUPP);
241 }
242
243 /*
244 * vop_nostrategy:
245 *
246 * Strategy routine for VFS devices that have none.
247 *
248 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
249 * routine. Typically this is done for a BIO_READ strategy call.
250 * Typically B_INVAL is assumed to already be clear prior to a write
251 * and should not be cleared manually unless you just made the buffer
252 * invalid. BIO_ERROR should be cleared either way.
253 */
254
255 static int
vop_nostrategy(struct vop_strategy_args * ap)256 vop_nostrategy (struct vop_strategy_args *ap)
257 {
258 printf("No strategy for buffer at %p\n", ap->a_bp);
259 vprint("vnode", ap->a_vp);
260 ap->a_bp->b_ioflags |= BIO_ERROR;
261 ap->a_bp->b_error = EOPNOTSUPP;
262 bufdone(ap->a_bp);
263 return (EOPNOTSUPP);
264 }
265
266 static int
get_next_dirent(struct vnode * vp,struct dirent ** dpp,char * dirbuf,int dirbuflen,off_t * off,char ** cpos,int * len,int * eofflag,struct thread * td)267 get_next_dirent(struct vnode *vp, struct dirent **dpp, char *dirbuf,
268 int dirbuflen, off_t *off, char **cpos, int *len,
269 int *eofflag, struct thread *td)
270 {
271 int error, reclen;
272 struct uio uio;
273 struct iovec iov;
274 struct dirent *dp;
275
276 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
277 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
278
279 if (*len == 0) {
280 iov.iov_base = dirbuf;
281 iov.iov_len = dirbuflen;
282
283 uio.uio_iov = &iov;
284 uio.uio_iovcnt = 1;
285 uio.uio_offset = *off;
286 uio.uio_resid = dirbuflen;
287 uio.uio_segflg = UIO_SYSSPACE;
288 uio.uio_rw = UIO_READ;
289 uio.uio_td = td;
290
291 *eofflag = 0;
292
293 #ifdef MAC
294 error = mac_vnode_check_readdir(td->td_ucred, vp);
295 if (error == 0)
296 #endif
297 error = VOP_READDIR(vp, &uio, td->td_ucred, eofflag,
298 NULL, NULL);
299 if (error)
300 return (error);
301
302 *off = uio.uio_offset;
303
304 *cpos = dirbuf;
305 *len = (dirbuflen - uio.uio_resid);
306
307 if (*len == 0)
308 return (ENOENT);
309 }
310
311 dp = (struct dirent *)(*cpos);
312 reclen = dp->d_reclen;
313 *dpp = dp;
314
315 /* check for malformed directory.. */
316 if (reclen < DIRENT_MINSIZE)
317 return (EINVAL);
318
319 *cpos += reclen;
320 *len -= reclen;
321
322 return (0);
323 }
324
325 /*
326 * Check if a named file exists in a given directory vnode.
327 */
328 static int
dirent_exists(struct vnode * vp,const char * dirname,struct thread * td)329 dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
330 {
331 char *dirbuf, *cpos;
332 int error, eofflag, dirbuflen, len, found;
333 off_t off;
334 struct dirent *dp;
335 struct vattr va;
336
337 KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
338 KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));
339
340 found = 0;
341
342 error = VOP_GETATTR(vp, &va, td->td_ucred);
343 if (error)
344 return (found);
345
346 dirbuflen = DEV_BSIZE;
347 if (dirbuflen < va.va_blocksize)
348 dirbuflen = va.va_blocksize;
349 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
350
351 off = 0;
352 len = 0;
353 do {
354 error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off,
355 &cpos, &len, &eofflag, td);
356 if (error)
357 goto out;
358
359 if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
360 strcmp(dp->d_name, dirname) == 0) {
361 found = 1;
362 goto out;
363 }
364 } while (len > 0 || !eofflag);
365
366 out:
367 free(dirbuf, M_TEMP);
368 return (found);
369 }
370
371 int
vop_stdaccess(struct vop_access_args * ap)372 vop_stdaccess(struct vop_access_args *ap)
373 {
374
375 KASSERT((ap->a_accmode & ~(VEXEC | VWRITE | VREAD | VADMIN |
376 VAPPEND)) == 0, ("invalid bit in accmode"));
377
378 return (VOP_ACCESSX(ap->a_vp, ap->a_accmode, ap->a_cred, ap->a_td));
379 }
380
381 int
vop_stdaccessx(struct vop_accessx_args * ap)382 vop_stdaccessx(struct vop_accessx_args *ap)
383 {
384 int error;
385 accmode_t accmode = ap->a_accmode;
386
387 error = vfs_unixify_accmode(&accmode);
388 if (error != 0)
389 return (error);
390
391 if (accmode == 0)
392 return (0);
393
394 return (VOP_ACCESS(ap->a_vp, accmode, ap->a_cred, ap->a_td));
395 }
396
397 /*
398 * Advisory record locking support
399 */
400 int
vop_stdadvlock(struct vop_advlock_args * ap)401 vop_stdadvlock(struct vop_advlock_args *ap)
402 {
403 struct vnode *vp;
404 struct vattr vattr;
405 int error;
406
407 vp = ap->a_vp;
408 if (ap->a_fl->l_whence == SEEK_END) {
409 /*
410 * The NFSv4 server must avoid doing a vn_lock() here, since it
411 * can deadlock the nfsd threads, due to a LOR. Fortunately
412 * the NFSv4 server always uses SEEK_SET and this code is
413 * only required for the SEEK_END case.
414 */
415 vn_lock(vp, LK_SHARED | LK_RETRY);
416 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
417 VOP_UNLOCK(vp, 0);
418 if (error)
419 return (error);
420 } else
421 vattr.va_size = 0;
422
423 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
424 }
425
426 int
vop_stdadvlockasync(struct vop_advlockasync_args * ap)427 vop_stdadvlockasync(struct vop_advlockasync_args *ap)
428 {
429 struct vnode *vp;
430 struct vattr vattr;
431 int error;
432
433 vp = ap->a_vp;
434 if (ap->a_fl->l_whence == SEEK_END) {
435 /* The size argument is only needed for SEEK_END. */
436 vn_lock(vp, LK_SHARED | LK_RETRY);
437 error = VOP_GETATTR(vp, &vattr, curthread->td_ucred);
438 VOP_UNLOCK(vp, 0);
439 if (error)
440 return (error);
441 } else
442 vattr.va_size = 0;
443
444 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
445 }
446
447 int
vop_stdadvlockpurge(struct vop_advlockpurge_args * ap)448 vop_stdadvlockpurge(struct vop_advlockpurge_args *ap)
449 {
450 struct vnode *vp;
451
452 vp = ap->a_vp;
453 lf_purgelocks(vp, &vp->v_lockf);
454 return (0);
455 }
456
457 /*
458 * vop_stdpathconf:
459 *
460 * Standard implementation of POSIX pathconf, to get information about limits
461 * for a filesystem.
462 * Override per filesystem for the case where the filesystem has smaller
463 * limits.
464 */
465 int
vop_stdpathconf(ap)466 vop_stdpathconf(ap)
467 struct vop_pathconf_args /* {
468 struct vnode *a_vp;
469 int a_name;
470 int *a_retval;
471 } */ *ap;
472 {
473
474 switch (ap->a_name) {
475 case _PC_NAME_MAX:
476 *ap->a_retval = NAME_MAX;
477 return (0);
478 case _PC_PATH_MAX:
479 *ap->a_retval = PATH_MAX;
480 return (0);
481 case _PC_LINK_MAX:
482 *ap->a_retval = LINK_MAX;
483 return (0);
484 case _PC_MAX_CANON:
485 *ap->a_retval = MAX_CANON;
486 return (0);
487 case _PC_MAX_INPUT:
488 *ap->a_retval = MAX_INPUT;
489 return (0);
490 case _PC_PIPE_BUF:
491 *ap->a_retval = PIPE_BUF;
492 return (0);
493 case _PC_CHOWN_RESTRICTED:
494 *ap->a_retval = 1;
495 return (0);
496 case _PC_VDISABLE:
497 *ap->a_retval = _POSIX_VDISABLE;
498 return (0);
499 default:
500 return (EINVAL);
501 }
502 /* NOTREACHED */
503 }
504
505 /*
506 * Standard lock, unlock and islocked functions.
507 */
508 int
vop_stdlock(ap)509 vop_stdlock(ap)
510 struct vop_lock1_args /* {
511 struct vnode *a_vp;
512 int a_flags;
513 char *file;
514 int line;
515 } */ *ap;
516 {
517 struct vnode *vp = ap->a_vp;
518
519 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
520 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
521 ap->a_line));
522 }
523
524 /* See above. */
525 int
vop_stdunlock(ap)526 vop_stdunlock(ap)
527 struct vop_unlock_args /* {
528 struct vnode *a_vp;
529 int a_flags;
530 } */ *ap;
531 {
532 struct vnode *vp = ap->a_vp;
533
534 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp)));
535 }
536
537 /* See above. */
538 int
vop_stdislocked(ap)539 vop_stdislocked(ap)
540 struct vop_islocked_args /* {
541 struct vnode *a_vp;
542 } */ *ap;
543 {
544
545 return (lockstatus(ap->a_vp->v_vnlock));
546 }
547
548 /*
549 * Return true for select/poll.
550 */
551 int
vop_nopoll(ap)552 vop_nopoll(ap)
553 struct vop_poll_args /* {
554 struct vnode *a_vp;
555 int a_events;
556 struct ucred *a_cred;
557 struct thread *a_td;
558 } */ *ap;
559 {
560
561 return (poll_no_poll(ap->a_events));
562 }
563
564 /*
565 * Implement poll for local filesystems that support it.
566 */
567 int
vop_stdpoll(ap)568 vop_stdpoll(ap)
569 struct vop_poll_args /* {
570 struct vnode *a_vp;
571 int a_events;
572 struct ucred *a_cred;
573 struct thread *a_td;
574 } */ *ap;
575 {
576 if (ap->a_events & ~POLLSTANDARD)
577 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
578 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
579 }
580
581 /*
582 * Return our mount point, as we will take charge of the writes.
583 */
584 int
vop_stdgetwritemount(ap)585 vop_stdgetwritemount(ap)
586 struct vop_getwritemount_args /* {
587 struct vnode *a_vp;
588 struct mount **a_mpp;
589 } */ *ap;
590 {
591 struct mount *mp;
592
593 /*
594 * XXX Since this is called unlocked we may be recycled while
595 * attempting to ref the mount. If this is the case or mountpoint
596 * will be set to NULL. We only have to prevent this call from
597 * returning with a ref to an incorrect mountpoint. It is not
598 * harmful to return with a ref to our previous mountpoint.
599 */
600 mp = ap->a_vp->v_mount;
601 if (mp != NULL) {
602 vfs_ref(mp);
603 if (mp != ap->a_vp->v_mount) {
604 vfs_rel(mp);
605 mp = NULL;
606 }
607 }
608 *(ap->a_mpp) = mp;
609 return (0);
610 }
611
612 /* XXX Needs good comment and VOP_BMAP(9) manpage */
613 int
vop_stdbmap(ap)614 vop_stdbmap(ap)
615 struct vop_bmap_args /* {
616 struct vnode *a_vp;
617 daddr_t a_bn;
618 struct bufobj **a_bop;
619 daddr_t *a_bnp;
620 int *a_runp;
621 int *a_runb;
622 } */ *ap;
623 {
624
625 if (ap->a_bop != NULL)
626 *ap->a_bop = &ap->a_vp->v_bufobj;
627 if (ap->a_bnp != NULL)
628 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
629 if (ap->a_runp != NULL)
630 *ap->a_runp = 0;
631 if (ap->a_runb != NULL)
632 *ap->a_runb = 0;
633 return (0);
634 }
635
636 int
vop_stdfsync(ap)637 vop_stdfsync(ap)
638 struct vop_fsync_args /* {
639 struct vnode *a_vp;
640 struct ucred *a_cred;
641 int a_waitfor;
642 struct thread *a_td;
643 } */ *ap;
644 {
645 struct vnode *vp = ap->a_vp;
646 struct buf *bp;
647 struct bufobj *bo;
648 struct buf *nbp;
649 int error = 0;
650 int maxretry = 1000; /* large, arbitrarily chosen */
651
652 bo = &vp->v_bufobj;
653 BO_LOCK(bo);
654 loop1:
655 /*
656 * MARK/SCAN initialization to avoid infinite loops.
657 */
658 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
659 bp->b_vflags &= ~BV_SCANNED;
660 bp->b_error = 0;
661 }
662
663 /*
664 * Flush all dirty buffers associated with a vnode.
665 */
666 loop2:
667 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
668 if ((bp->b_vflags & BV_SCANNED) != 0)
669 continue;
670 bp->b_vflags |= BV_SCANNED;
671 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
672 if (ap->a_waitfor != MNT_WAIT)
673 continue;
674 if (BUF_LOCK(bp,
675 LK_EXCLUSIVE | LK_INTERLOCK | LK_SLEEPFAIL,
676 BO_LOCKPTR(bo)) != 0) {
677 BO_LOCK(bo);
678 goto loop1;
679 }
680 BO_LOCK(bo);
681 }
682 BO_UNLOCK(bo);
683 KASSERT(bp->b_bufobj == bo,
684 ("bp %p wrong b_bufobj %p should be %p",
685 bp, bp->b_bufobj, bo));
686 if ((bp->b_flags & B_DELWRI) == 0)
687 panic("fsync: not dirty");
688 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
689 vfs_bio_awrite(bp);
690 } else {
691 bremfree(bp);
692 bawrite(bp);
693 }
694 BO_LOCK(bo);
695 goto loop2;
696 }
697
698 /*
699 * If synchronous the caller expects us to completely resolve all
700 * dirty buffers in the system. Wait for in-progress I/O to
701 * complete (which could include background bitmap writes), then
702 * retry if dirty blocks still exist.
703 */
704 if (ap->a_waitfor == MNT_WAIT) {
705 bufobj_wwait(bo, 0, 0);
706 if (bo->bo_dirty.bv_cnt > 0) {
707 /*
708 * If we are unable to write any of these buffers
709 * then we fail now rather than trying endlessly
710 * to write them out.
711 */
712 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
713 if ((error = bp->b_error) == 0)
714 continue;
715 if (error == 0 && --maxretry >= 0)
716 goto loop1;
717 error = EAGAIN;
718 }
719 }
720 BO_UNLOCK(bo);
721 if (error == EAGAIN)
722 vprint("fsync: giving up on dirty", vp);
723
724 return (error);
725 }
726
727 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
728 int
vop_stdgetpages(ap)729 vop_stdgetpages(ap)
730 struct vop_getpages_args /* {
731 struct vnode *a_vp;
732 vm_page_t *a_m;
733 int a_count;
734 int *a_rbehind;
735 int *a_rahead;
736 } */ *ap;
737 {
738
739 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
740 ap->a_count, ap->a_rbehind, ap->a_rahead, NULL, NULL);
741 }
742
743 static int
vop_stdgetpages_async(struct vop_getpages_async_args * ap)744 vop_stdgetpages_async(struct vop_getpages_async_args *ap)
745 {
746 int error;
747
748 error = VOP_GETPAGES(ap->a_vp, ap->a_m, ap->a_count, ap->a_rbehind,
749 ap->a_rahead);
750 ap->a_iodone(ap->a_arg, ap->a_m, ap->a_count, error);
751 return (error);
752 }
753
754 int
vop_stdkqfilter(struct vop_kqfilter_args * ap)755 vop_stdkqfilter(struct vop_kqfilter_args *ap)
756 {
757 return vfs_kqfilter(ap);
758 }
759
760 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
761 int
vop_stdputpages(ap)762 vop_stdputpages(ap)
763 struct vop_putpages_args /* {
764 struct vnode *a_vp;
765 vm_page_t *a_m;
766 int a_count;
767 int a_sync;
768 int *a_rtvals;
769 } */ *ap;
770 {
771
772 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
773 ap->a_sync, ap->a_rtvals);
774 }
775
776 int
vop_stdvptofh(struct vop_vptofh_args * ap)777 vop_stdvptofh(struct vop_vptofh_args *ap)
778 {
779 return (EOPNOTSUPP);
780 }
781
782 int
vop_stdvptocnp(struct vop_vptocnp_args * ap)783 vop_stdvptocnp(struct vop_vptocnp_args *ap)
784 {
785 struct vnode *vp = ap->a_vp;
786 struct vnode **dvp = ap->a_vpp;
787 struct ucred *cred = ap->a_cred;
788 char *buf = ap->a_buf;
789 int *buflen = ap->a_buflen;
790 char *dirbuf, *cpos;
791 int i, error, eofflag, dirbuflen, flags, locked, len, covered;
792 off_t off;
793 ino_t fileno;
794 struct vattr va;
795 struct nameidata nd;
796 struct thread *td;
797 struct dirent *dp;
798 struct vnode *mvp;
799
800 i = *buflen;
801 error = 0;
802 covered = 0;
803 td = curthread;
804
805 if (vp->v_type != VDIR)
806 return (ENOENT);
807
808 error = VOP_GETATTR(vp, &va, cred);
809 if (error)
810 return (error);
811
812 VREF(vp);
813 locked = VOP_ISLOCKED(vp);
814 VOP_UNLOCK(vp, 0);
815 NDINIT_ATVP(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF, UIO_SYSSPACE,
816 "..", vp, td);
817 flags = FREAD;
818 error = vn_open_cred(&nd, &flags, 0, VN_OPEN_NOAUDIT, cred, NULL);
819 if (error) {
820 vn_lock(vp, locked | LK_RETRY);
821 return (error);
822 }
823 NDFREE(&nd, NDF_ONLY_PNBUF);
824
825 mvp = *dvp = nd.ni_vp;
826
827 if (vp->v_mount != (*dvp)->v_mount &&
828 ((*dvp)->v_vflag & VV_ROOT) &&
829 ((*dvp)->v_mount->mnt_flag & MNT_UNION)) {
830 *dvp = (*dvp)->v_mount->mnt_vnodecovered;
831 VREF(mvp);
832 VOP_UNLOCK(mvp, 0);
833 vn_close(mvp, FREAD, cred, td);
834 VREF(*dvp);
835 vn_lock(*dvp, LK_SHARED | LK_RETRY);
836 covered = 1;
837 }
838
839 fileno = va.va_fileid;
840
841 dirbuflen = DEV_BSIZE;
842 if (dirbuflen < va.va_blocksize)
843 dirbuflen = va.va_blocksize;
844 dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);
845
846 if ((*dvp)->v_type != VDIR) {
847 error = ENOENT;
848 goto out;
849 }
850
851 off = 0;
852 len = 0;
853 do {
854 /* call VOP_READDIR of parent */
855 error = get_next_dirent(*dvp, &dp, dirbuf, dirbuflen, &off,
856 &cpos, &len, &eofflag, td);
857 if (error)
858 goto out;
859
860 if ((dp->d_type != DT_WHT) &&
861 (dp->d_fileno == fileno)) {
862 if (covered) {
863 VOP_UNLOCK(*dvp, 0);
864 vn_lock(mvp, LK_SHARED | LK_RETRY);
865 if (dirent_exists(mvp, dp->d_name, td)) {
866 error = ENOENT;
867 VOP_UNLOCK(mvp, 0);
868 vn_lock(*dvp, LK_SHARED | LK_RETRY);
869 goto out;
870 }
871 VOP_UNLOCK(mvp, 0);
872 vn_lock(*dvp, LK_SHARED | LK_RETRY);
873 }
874 i -= dp->d_namlen;
875
876 if (i < 0) {
877 error = ENOMEM;
878 goto out;
879 }
880 if (dp->d_namlen == 1 && dp->d_name[0] == '.') {
881 error = ENOENT;
882 } else {
883 bcopy(dp->d_name, buf + i, dp->d_namlen);
884 error = 0;
885 }
886 goto out;
887 }
888 } while (len > 0 || !eofflag);
889 error = ENOENT;
890
891 out:
892 free(dirbuf, M_TEMP);
893 if (!error) {
894 *buflen = i;
895 vref(*dvp);
896 }
897 if (covered) {
898 vput(*dvp);
899 vrele(mvp);
900 } else {
901 VOP_UNLOCK(mvp, 0);
902 vn_close(mvp, FREAD, cred, td);
903 }
904 vn_lock(vp, locked | LK_RETRY);
905 return (error);
906 }
907
908 int
vop_stdallocate(struct vop_allocate_args * ap)909 vop_stdallocate(struct vop_allocate_args *ap)
910 {
911 #ifdef __notyet__
912 struct statfs sfs;
913 #endif
914 struct iovec aiov;
915 struct vattr vattr, *vap;
916 struct uio auio;
917 off_t fsize, len, cur, offset;
918 uint8_t *buf;
919 struct thread *td;
920 struct vnode *vp;
921 size_t iosize;
922 int error;
923
924 buf = NULL;
925 error = 0;
926 td = curthread;
927 vap = &vattr;
928 vp = ap->a_vp;
929 len = *ap->a_len;
930 offset = *ap->a_offset;
931
932 error = VOP_GETATTR(vp, vap, td->td_ucred);
933 if (error != 0)
934 goto out;
935 fsize = vap->va_size;
936 iosize = vap->va_blocksize;
937 if (iosize == 0)
938 iosize = BLKDEV_IOSIZE;
939 if (iosize > MAXPHYS)
940 iosize = MAXPHYS;
941 buf = malloc(iosize, M_TEMP, M_WAITOK);
942
943 #ifdef __notyet__
944 /*
945 * Check if the filesystem sets f_maxfilesize; if not use
946 * VOP_SETATTR to perform the check.
947 */
948 error = VFS_STATFS(vp->v_mount, &sfs, td);
949 if (error != 0)
950 goto out;
951 if (sfs.f_maxfilesize) {
952 if (offset > sfs.f_maxfilesize || len > sfs.f_maxfilesize ||
953 offset + len > sfs.f_maxfilesize) {
954 error = EFBIG;
955 goto out;
956 }
957 } else
958 #endif
959 if (offset + len > vap->va_size) {
960 /*
961 * Test offset + len against the filesystem's maxfilesize.
962 */
963 VATTR_NULL(vap);
964 vap->va_size = offset + len;
965 error = VOP_SETATTR(vp, vap, td->td_ucred);
966 if (error != 0)
967 goto out;
968 VATTR_NULL(vap);
969 vap->va_size = fsize;
970 error = VOP_SETATTR(vp, vap, td->td_ucred);
971 if (error != 0)
972 goto out;
973 }
974
975 for (;;) {
976 /*
977 * Read and write back anything below the nominal file
978 * size. There's currently no way outside the filesystem
979 * to know whether this area is sparse or not.
980 */
981 cur = iosize;
982 if ((offset % iosize) != 0)
983 cur -= (offset % iosize);
984 if (cur > len)
985 cur = len;
986 if (offset < fsize) {
987 aiov.iov_base = buf;
988 aiov.iov_len = cur;
989 auio.uio_iov = &aiov;
990 auio.uio_iovcnt = 1;
991 auio.uio_offset = offset;
992 auio.uio_resid = cur;
993 auio.uio_segflg = UIO_SYSSPACE;
994 auio.uio_rw = UIO_READ;
995 auio.uio_td = td;
996 error = VOP_READ(vp, &auio, 0, td->td_ucred);
997 if (error != 0)
998 break;
999 if (auio.uio_resid > 0) {
1000 bzero(buf + cur - auio.uio_resid,
1001 auio.uio_resid);
1002 }
1003 } else {
1004 bzero(buf, cur);
1005 }
1006
1007 aiov.iov_base = buf;
1008 aiov.iov_len = cur;
1009 auio.uio_iov = &aiov;
1010 auio.uio_iovcnt = 1;
1011 auio.uio_offset = offset;
1012 auio.uio_resid = cur;
1013 auio.uio_segflg = UIO_SYSSPACE;
1014 auio.uio_rw = UIO_WRITE;
1015 auio.uio_td = td;
1016
1017 error = VOP_WRITE(vp, &auio, 0, td->td_ucred);
1018 if (error != 0)
1019 break;
1020
1021 len -= cur;
1022 offset += cur;
1023 if (len == 0)
1024 break;
1025 if (should_yield())
1026 break;
1027 }
1028
1029 out:
1030 *ap->a_len = len;
1031 *ap->a_offset = offset;
1032 free(buf, M_TEMP);
1033 return (error);
1034 }
1035
1036 int
vop_stdadvise(struct vop_advise_args * ap)1037 vop_stdadvise(struct vop_advise_args *ap)
1038 {
1039 struct vnode *vp;
1040 struct bufobj *bo;
1041 daddr_t startn, endn;
1042 int bsize, error;
1043
1044 vp = ap->a_vp;
1045 switch (ap->a_advice) {
1046 case POSIX_FADV_WILLNEED:
1047 /*
1048 * Do nothing for now. Filesystems should provide a
1049 * custom method which starts an asynchronous read of
1050 * the requested region.
1051 */
1052 error = 0;
1053 break;
1054 case POSIX_FADV_DONTNEED:
1055 error = 0;
1056 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1057 if (vp->v_iflag & VI_DOOMED) {
1058 VOP_UNLOCK(vp, 0);
1059 break;
1060 }
1061
1062 /*
1063 * Deactivate pages in the specified range from the backing VM
1064 * object. Pages that are resident in the buffer cache will
1065 * remain wired until their corresponding buffers are released
1066 * below.
1067 */
1068 if (vp->v_object != NULL) {
1069 int start = trunc_page(ap->a_start);
1070 int end = round_page(ap->a_end);
1071
1072 VM_OBJECT_WLOCK(vp->v_object);
1073 vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start),
1074 OFF_TO_IDX(end));
1075 VM_OBJECT_WUNLOCK(vp->v_object);
1076 }
1077
1078 bo = &vp->v_bufobj;
1079 BO_RLOCK(bo);
1080 bsize = vp->v_bufobj.bo_bsize;
1081 startn = ap->a_start / bsize;
1082 endn = ap->a_end / bsize;
1083 error = bnoreuselist(&bo->bo_clean, bo, startn, endn);
1084 if (error == 0)
1085 error = bnoreuselist(&bo->bo_dirty, bo, startn, endn);
1086 BO_RUNLOCK(bo);
1087 VOP_UNLOCK(vp, 0);
1088 break;
1089 default:
1090 error = EINVAL;
1091 break;
1092 }
1093 return (error);
1094 }
1095
1096 int
vop_stdunp_bind(struct vop_unp_bind_args * ap)1097 vop_stdunp_bind(struct vop_unp_bind_args *ap)
1098 {
1099
1100 ap->a_vp->v_socket = ap->a_socket;
1101 return (0);
1102 }
1103
1104 int
vop_stdunp_connect(struct vop_unp_connect_args * ap)1105 vop_stdunp_connect(struct vop_unp_connect_args *ap)
1106 {
1107
1108 *ap->a_socket = ap->a_vp->v_socket;
1109 return (0);
1110 }
1111
1112 int
vop_stdunp_detach(struct vop_unp_detach_args * ap)1113 vop_stdunp_detach(struct vop_unp_detach_args *ap)
1114 {
1115
1116 ap->a_vp->v_socket = NULL;
1117 return (0);
1118 }
1119
1120 static int
vop_stdis_text(struct vop_is_text_args * ap)1121 vop_stdis_text(struct vop_is_text_args *ap)
1122 {
1123
1124 return ((ap->a_vp->v_vflag & VV_TEXT) != 0);
1125 }
1126
1127 static int
vop_stdset_text(struct vop_set_text_args * ap)1128 vop_stdset_text(struct vop_set_text_args *ap)
1129 {
1130
1131 ap->a_vp->v_vflag |= VV_TEXT;
1132 return (0);
1133 }
1134
1135 static int
vop_stdunset_text(struct vop_unset_text_args * ap)1136 vop_stdunset_text(struct vop_unset_text_args *ap)
1137 {
1138
1139 ap->a_vp->v_vflag &= ~VV_TEXT;
1140 return (0);
1141 }
1142
1143 static int
vop_stdget_writecount(struct vop_get_writecount_args * ap)1144 vop_stdget_writecount(struct vop_get_writecount_args *ap)
1145 {
1146
1147 *ap->a_writecount = ap->a_vp->v_writecount;
1148 return (0);
1149 }
1150
1151 static int
vop_stdadd_writecount(struct vop_add_writecount_args * ap)1152 vop_stdadd_writecount(struct vop_add_writecount_args *ap)
1153 {
1154
1155 ap->a_vp->v_writecount += ap->a_inc;
1156 return (0);
1157 }
1158
1159 /*
1160 * vfs default ops
1161 * used to fill the vfs function table to get reasonable default return values.
1162 */
1163 int
vfs_stdroot(mp,flags,vpp)1164 vfs_stdroot (mp, flags, vpp)
1165 struct mount *mp;
1166 int flags;
1167 struct vnode **vpp;
1168 {
1169
1170 return (EOPNOTSUPP);
1171 }
1172
1173 int
vfs_stdstatfs(mp,sbp)1174 vfs_stdstatfs (mp, sbp)
1175 struct mount *mp;
1176 struct statfs *sbp;
1177 {
1178
1179 return (EOPNOTSUPP);
1180 }
1181
1182 int
vfs_stdquotactl(mp,cmds,uid,arg)1183 vfs_stdquotactl (mp, cmds, uid, arg)
1184 struct mount *mp;
1185 int cmds;
1186 uid_t uid;
1187 void *arg;
1188 {
1189
1190 return (EOPNOTSUPP);
1191 }
1192
1193 int
vfs_stdsync(mp,waitfor)1194 vfs_stdsync(mp, waitfor)
1195 struct mount *mp;
1196 int waitfor;
1197 {
1198 struct vnode *vp, *mvp;
1199 struct thread *td;
1200 int error, lockreq, allerror = 0;
1201
1202 td = curthread;
1203 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
1204 if (waitfor != MNT_WAIT)
1205 lockreq |= LK_NOWAIT;
1206 /*
1207 * Force stale buffer cache information to be flushed.
1208 */
1209 loop:
1210 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1211 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
1212 VI_UNLOCK(vp);
1213 continue;
1214 }
1215 if ((error = vget(vp, lockreq, td)) != 0) {
1216 if (error == ENOENT) {
1217 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1218 goto loop;
1219 }
1220 continue;
1221 }
1222 error = VOP_FSYNC(vp, waitfor, td);
1223 if (error)
1224 allerror = error;
1225 vput(vp);
1226 }
1227 return (allerror);
1228 }
1229
1230 int
vfs_stdnosync(mp,waitfor)1231 vfs_stdnosync (mp, waitfor)
1232 struct mount *mp;
1233 int waitfor;
1234 {
1235
1236 return (0);
1237 }
1238
1239 int
vfs_stdvget(mp,ino,flags,vpp)1240 vfs_stdvget (mp, ino, flags, vpp)
1241 struct mount *mp;
1242 ino_t ino;
1243 int flags;
1244 struct vnode **vpp;
1245 {
1246
1247 return (EOPNOTSUPP);
1248 }
1249
1250 int
vfs_stdfhtovp(mp,fhp,flags,vpp)1251 vfs_stdfhtovp (mp, fhp, flags, vpp)
1252 struct mount *mp;
1253 struct fid *fhp;
1254 int flags;
1255 struct vnode **vpp;
1256 {
1257
1258 return (EOPNOTSUPP);
1259 }
1260
1261 int
vfs_stdinit(vfsp)1262 vfs_stdinit (vfsp)
1263 struct vfsconf *vfsp;
1264 {
1265
1266 return (0);
1267 }
1268
1269 int
vfs_stduninit(vfsp)1270 vfs_stduninit (vfsp)
1271 struct vfsconf *vfsp;
1272 {
1273
1274 return(0);
1275 }
1276
1277 int
vfs_stdextattrctl(mp,cmd,filename_vp,attrnamespace,attrname)1278 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname)
1279 struct mount *mp;
1280 int cmd;
1281 struct vnode *filename_vp;
1282 int attrnamespace;
1283 const char *attrname;
1284 {
1285
1286 if (filename_vp != NULL)
1287 VOP_UNLOCK(filename_vp, 0);
1288 return (EOPNOTSUPP);
1289 }
1290
1291 int
vfs_stdsysctl(mp,op,req)1292 vfs_stdsysctl(mp, op, req)
1293 struct mount *mp;
1294 fsctlop_t op;
1295 struct sysctl_req *req;
1296 {
1297
1298 return (EOPNOTSUPP);
1299 }
1300
1301 /* end of vfs default ops */
1302