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: releng/6.0/sys/kern/vfs_default.c 147388 2005-06-14 20:32:27Z jeff $");
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/malloc.h>
48 #include <sys/mount.h>
49 #include <sys/mutex.h>
50 #include <sys/unistd.h>
51 #include <sys/vnode.h>
52 #include <sys/poll.h>
53
54 #include <vm/vm.h>
55 #include <vm/vm_object.h>
56 #include <vm/vm_extern.h>
57 #include <vm/pmap.h>
58 #include <vm/vm_map.h>
59 #include <vm/vm_page.h>
60 #include <vm/vm_pager.h>
61 #include <vm/vnode_pager.h>
62
63 static int vop_nolookup(struct vop_lookup_args *);
64 static int vop_nostrategy(struct vop_strategy_args *);
65
66 /*
67 * This vnode table stores what we want to do if the filesystem doesn't
68 * implement a particular VOP.
69 *
70 * If there is no specific entry here, we will return EOPNOTSUPP.
71 *
72 */
73
74 struct vop_vector default_vnodeops = {
75 .vop_default = NULL,
76 .vop_bypass = VOP_EOPNOTSUPP,
77
78 .vop_advlock = VOP_EINVAL,
79 .vop_bmap = vop_stdbmap,
80 .vop_close = VOP_NULL,
81 .vop_fsync = VOP_NULL,
82 .vop_getpages = vop_stdgetpages,
83 .vop_getwritemount = vop_stdgetwritemount,
84 .vop_inactive = VOP_NULL,
85 .vop_ioctl = VOP_ENOTTY,
86 .vop_kqfilter = vop_stdkqfilter,
87 .vop_islocked = vop_stdislocked,
88 .vop_lease = VOP_NULL,
89 .vop_lock = vop_stdlock,
90 .vop_lookup = vop_nolookup,
91 .vop_open = VOP_NULL,
92 .vop_pathconf = VOP_EINVAL,
93 .vop_poll = vop_nopoll,
94 .vop_putpages = vop_stdputpages,
95 .vop_readlink = VOP_EINVAL,
96 .vop_revoke = VOP_PANIC,
97 .vop_strategy = vop_nostrategy,
98 .vop_unlock = vop_stdunlock,
99 };
100
101 /*
102 * Series of placeholder functions for various error returns for
103 * VOPs.
104 */
105
106 int
107 vop_eopnotsupp(struct vop_generic_args *ap)
108 {
109 /*
110 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
111 */
112
113 return (EOPNOTSUPP);
114 }
115
116 int
117 vop_ebadf(struct vop_generic_args *ap)
118 {
119
120 return (EBADF);
121 }
122
123 int
124 vop_enotty(struct vop_generic_args *ap)
125 {
126
127 return (ENOTTY);
128 }
129
130 int
131 vop_einval(struct vop_generic_args *ap)
132 {
133
134 return (EINVAL);
135 }
136
137 int
138 vop_null(struct vop_generic_args *ap)
139 {
140
141 return (0);
142 }
143
144 /*
145 * Helper function to panic on some bad VOPs in some filesystems.
146 */
147 int
148 vop_panic(struct vop_generic_args *ap)
149 {
150
151 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
152 }
153
154 /*
155 * vop_std<something> and vop_no<something> are default functions for use by
156 * filesystems that need the "default reasonable" implementation for a
157 * particular operation.
158 *
159 * The documentation for the operations they implement exists (if it exists)
160 * in the VOP_<SOMETHING>(9) manpage (all uppercase).
161 */
162
163 /*
164 * Default vop for filesystems that do not support name lookup
165 */
166 static int
167 vop_nolookup(ap)
168 struct vop_lookup_args /* {
169 struct vnode *a_dvp;
170 struct vnode **a_vpp;
171 struct componentname *a_cnp;
172 } */ *ap;
173 {
174
175 *ap->a_vpp = NULL;
176 return (ENOTDIR);
177 }
178
179 /*
180 * vop_nostrategy:
181 *
182 * Strategy routine for VFS devices that have none.
183 *
184 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
185 * routine. Typically this is done for a BIO_READ strategy call.
186 * Typically B_INVAL is assumed to already be clear prior to a write
187 * and should not be cleared manually unless you just made the buffer
188 * invalid. BIO_ERROR should be cleared either way.
189 */
190
191 static int
192 vop_nostrategy (struct vop_strategy_args *ap)
193 {
194 printf("No strategy for buffer at %p\n", ap->a_bp);
195 vprint("vnode", ap->a_vp);
196 ap->a_bp->b_ioflags |= BIO_ERROR;
197 ap->a_bp->b_error = EOPNOTSUPP;
198 bufdone(ap->a_bp);
199 return (EOPNOTSUPP);
200 }
201
202 /*
203 * vop_stdpathconf:
204 *
205 * Standard implementation of POSIX pathconf, to get information about limits
206 * for a filesystem.
207 * Override per filesystem for the case where the filesystem has smaller
208 * limits.
209 */
210 int
211 vop_stdpathconf(ap)
212 struct vop_pathconf_args /* {
213 struct vnode *a_vp;
214 int a_name;
215 int *a_retval;
216 } */ *ap;
217 {
218
219 switch (ap->a_name) {
220 case _PC_LINK_MAX:
221 *ap->a_retval = LINK_MAX;
222 return (0);
223 case _PC_MAX_CANON:
224 *ap->a_retval = MAX_CANON;
225 return (0);
226 case _PC_MAX_INPUT:
227 *ap->a_retval = MAX_INPUT;
228 return (0);
229 case _PC_PIPE_BUF:
230 *ap->a_retval = PIPE_BUF;
231 return (0);
232 case _PC_CHOWN_RESTRICTED:
233 *ap->a_retval = 1;
234 return (0);
235 case _PC_VDISABLE:
236 *ap->a_retval = _POSIX_VDISABLE;
237 return (0);
238 default:
239 return (EINVAL);
240 }
241 /* NOTREACHED */
242 }
243
244 /*
245 * Standard lock, unlock and islocked functions.
246 */
247 int
248 vop_stdlock(ap)
249 struct vop_lock_args /* {
250 struct vnode *a_vp;
251 int a_flags;
252 struct thread *a_td;
253 } */ *ap;
254 {
255 struct vnode *vp = ap->a_vp;
256
257 #ifndef DEBUG_LOCKS
258 return (lockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), ap->a_td));
259 #else
260 return (debuglockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
261 ap->a_td, "vop_stdlock", vp->filename, vp->line));
262 #endif
263 }
264
265 /* See above. */
266 int
267 vop_stdunlock(ap)
268 struct vop_unlock_args /* {
269 struct vnode *a_vp;
270 int a_flags;
271 struct thread *a_td;
272 } */ *ap;
273 {
274 struct vnode *vp = ap->a_vp;
275
276 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp),
277 ap->a_td));
278 }
279
280 /* See above. */
281 int
282 vop_stdislocked(ap)
283 struct vop_islocked_args /* {
284 struct vnode *a_vp;
285 struct thread *a_td;
286 } */ *ap;
287 {
288
289 return (lockstatus(ap->a_vp->v_vnlock, ap->a_td));
290 }
291
292 /*
293 * Return true for select/poll.
294 */
295 int
296 vop_nopoll(ap)
297 struct vop_poll_args /* {
298 struct vnode *a_vp;
299 int a_events;
300 struct ucred *a_cred;
301 struct thread *a_td;
302 } */ *ap;
303 {
304 /*
305 * Return true for read/write. If the user asked for something
306 * special, return POLLNVAL, so that clients have a way of
307 * determining reliably whether or not the extended
308 * functionality is present without hard-coding knowledge
309 * of specific filesystem implementations.
310 * Stay in sync with kern_conf.c::no_poll().
311 */
312 if (ap->a_events & ~POLLSTANDARD)
313 return (POLLNVAL);
314
315 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
316 }
317
318 /*
319 * Implement poll for local filesystems that support it.
320 */
321 int
322 vop_stdpoll(ap)
323 struct vop_poll_args /* {
324 struct vnode *a_vp;
325 int a_events;
326 struct ucred *a_cred;
327 struct thread *a_td;
328 } */ *ap;
329 {
330 if (ap->a_events & ~POLLSTANDARD)
331 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
332 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
333 }
334
335 /*
336 * Return our mount point, as we will take charge of the writes.
337 */
338 int
339 vop_stdgetwritemount(ap)
340 struct vop_getwritemount_args /* {
341 struct vnode *a_vp;
342 struct mount **a_mpp;
343 } */ *ap;
344 {
345
346 *(ap->a_mpp) = ap->a_vp->v_mount;
347 return (0);
348 }
349
350 /* XXX Needs good comment and VOP_BMAP(9) manpage */
351 int
352 vop_stdbmap(ap)
353 struct vop_bmap_args /* {
354 struct vnode *a_vp;
355 daddr_t a_bn;
356 struct bufobj **a_bop;
357 daddr_t *a_bnp;
358 int *a_runp;
359 int *a_runb;
360 } */ *ap;
361 {
362
363 if (ap->a_bop != NULL)
364 *ap->a_bop = &ap->a_vp->v_bufobj;
365 if (ap->a_bnp != NULL)
366 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
367 if (ap->a_runp != NULL)
368 *ap->a_runp = 0;
369 if (ap->a_runb != NULL)
370 *ap->a_runb = 0;
371 return (0);
372 }
373
374 int
375 vop_stdfsync(ap)
376 struct vop_fsync_args /* {
377 struct vnode *a_vp;
378 struct ucred *a_cred;
379 int a_waitfor;
380 struct thread *a_td;
381 } */ *ap;
382 {
383 struct vnode *vp = ap->a_vp;
384 struct buf *bp;
385 struct bufobj *bo;
386 struct buf *nbp;
387 int error = 0;
388 int maxretry = 1000; /* large, arbitrarily chosen */
389
390 VI_LOCK(vp);
391 loop1:
392 /*
393 * MARK/SCAN initialization to avoid infinite loops.
394 */
395 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) {
396 bp->b_vflags &= ~BV_SCANNED;
397 bp->b_error = 0;
398 }
399
400 /*
401 * Flush all dirty buffers associated with a vnode.
402 */
403 loop2:
404 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) {
405 if ((bp->b_vflags & BV_SCANNED) != 0)
406 continue;
407 bp->b_vflags |= BV_SCANNED;
408 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
409 continue;
410 VI_UNLOCK(vp);
411 KASSERT(bp->b_bufobj == &vp->v_bufobj,
412 ("bp %p wrong b_bufobj %p should be %p",
413 bp, bp->b_bufobj, &vp->v_bufobj));
414 if ((bp->b_flags & B_DELWRI) == 0)
415 panic("fsync: not dirty");
416 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
417 vfs_bio_awrite(bp);
418 } else {
419 bremfree(bp);
420 bawrite(bp);
421 }
422 VI_LOCK(vp);
423 goto loop2;
424 }
425
426 /*
427 * If synchronous the caller expects us to completely resolve all
428 * dirty buffers in the system. Wait for in-progress I/O to
429 * complete (which could include background bitmap writes), then
430 * retry if dirty blocks still exist.
431 */
432 if (ap->a_waitfor == MNT_WAIT) {
433 bo = &vp->v_bufobj;
434 bufobj_wwait(bo, 0, 0);
435 if (bo->bo_dirty.bv_cnt > 0) {
436 /*
437 * If we are unable to write any of these buffers
438 * then we fail now rather than trying endlessly
439 * to write them out.
440 */
441 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
442 if ((error = bp->b_error) == 0)
443 continue;
444 if (error == 0 && --maxretry >= 0)
445 goto loop1;
446 error = EAGAIN;
447 }
448 }
449 VI_UNLOCK(vp);
450 if (error == EAGAIN)
451 vprint("fsync: giving up on dirty", vp);
452
453 return (error);
454 }
455
456 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
457 int
458 vop_stdgetpages(ap)
459 struct vop_getpages_args /* {
460 struct vnode *a_vp;
461 vm_page_t *a_m;
462 int a_count;
463 int a_reqpage;
464 vm_ooffset_t a_offset;
465 } */ *ap;
466 {
467
468 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
469 ap->a_count, ap->a_reqpage);
470 }
471
472 int
473 vop_stdkqfilter(struct vop_kqfilter_args *ap)
474 {
475 return vfs_kqfilter(ap);
476 }
477
478 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
479 int
480 vop_stdputpages(ap)
481 struct vop_putpages_args /* {
482 struct vnode *a_vp;
483 vm_page_t *a_m;
484 int a_count;
485 int a_sync;
486 int *a_rtvals;
487 vm_ooffset_t a_offset;
488 } */ *ap;
489 {
490
491 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
492 ap->a_sync, ap->a_rtvals);
493 }
494
495 /*
496 * vfs default ops
497 * used to fill the vfs function table to get reasonable default return values.
498 */
499 int
500 vfs_stdroot (mp, flags, vpp, td)
501 struct mount *mp;
502 int flags;
503 struct vnode **vpp;
504 struct thread *td;
505 {
506
507 return (EOPNOTSUPP);
508 }
509
510 int
511 vfs_stdstatfs (mp, sbp, td)
512 struct mount *mp;
513 struct statfs *sbp;
514 struct thread *td;
515 {
516
517 return (EOPNOTSUPP);
518 }
519
520 int
521 vfs_stdvptofh (vp, fhp)
522 struct vnode *vp;
523 struct fid *fhp;
524 {
525
526 return (EOPNOTSUPP);
527 }
528
529 int
530 vfs_stdquotactl (mp, cmds, uid, arg, td)
531 struct mount *mp;
532 int cmds;
533 uid_t uid;
534 caddr_t arg;
535 struct thread *td;
536 {
537
538 return (EOPNOTSUPP);
539 }
540
541 int
542 vfs_stdsync(mp, waitfor, td)
543 struct mount *mp;
544 int waitfor;
545 struct thread *td;
546 {
547 struct vnode *vp, *nvp;
548 int error, lockreq, allerror = 0;
549
550 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
551 if (waitfor != MNT_WAIT)
552 lockreq |= LK_NOWAIT;
553 /*
554 * Force stale buffer cache information to be flushed.
555 */
556 MNT_ILOCK(mp);
557 loop:
558 MNT_VNODE_FOREACH(vp, mp, nvp) {
559
560 VI_LOCK(vp);
561 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) {
562 VI_UNLOCK(vp);
563 continue;
564 }
565 MNT_IUNLOCK(mp);
566
567 if ((error = vget(vp, lockreq, td)) != 0) {
568 MNT_ILOCK(mp);
569 if (error == ENOENT)
570 goto loop;
571 continue;
572 }
573 error = VOP_FSYNC(vp, waitfor, td);
574 if (error)
575 allerror = error;
576
577 VOP_UNLOCK(vp, 0, td);
578 vrele(vp);
579 MNT_ILOCK(mp);
580 }
581 MNT_IUNLOCK(mp);
582 return (allerror);
583 }
584
585 int
586 vfs_stdnosync (mp, waitfor, td)
587 struct mount *mp;
588 int waitfor;
589 struct thread *td;
590 {
591
592 return (0);
593 }
594
595 int
596 vfs_stdvget (mp, ino, flags, vpp)
597 struct mount *mp;
598 ino_t ino;
599 int flags;
600 struct vnode **vpp;
601 {
602
603 return (EOPNOTSUPP);
604 }
605
606 int
607 vfs_stdfhtovp (mp, fhp, vpp)
608 struct mount *mp;
609 struct fid *fhp;
610 struct vnode **vpp;
611 {
612
613 return (EOPNOTSUPP);
614 }
615
616 int
617 vfs_stdinit (vfsp)
618 struct vfsconf *vfsp;
619 {
620
621 return (0);
622 }
623
624 int
625 vfs_stduninit (vfsp)
626 struct vfsconf *vfsp;
627 {
628
629 return(0);
630 }
631
632 int
633 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td)
634 struct mount *mp;
635 int cmd;
636 struct vnode *filename_vp;
637 int attrnamespace;
638 const char *attrname;
639 struct thread *td;
640 {
641
642 if (filename_vp != NULL)
643 VOP_UNLOCK(filename_vp, 0, td);
644 return (EOPNOTSUPP);
645 }
646
647 int
648 vfs_stdsysctl(mp, op, req)
649 struct mount *mp;
650 fsctlop_t op;
651 struct sysctl_req *req;
652 {
653
654 return (EOPNOTSUPP);
655 }
656
657 /* end of vfs default ops */
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