2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed
6 * to Berkeley by John Heidemann of the UCLA Ficus project.
8 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
43 #include <sys/event.h>
44 #include <sys/kernel.h>
45 #include <sys/limits.h>
47 #include <sys/lockf.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/mutex.h>
51 #include <sys/unistd.h>
52 #include <sys/vnode.h>
56 #include <vm/vm_object.h>
57 #include <vm/vm_extern.h>
59 #include <vm/vm_map.h>
60 #include <vm/vm_page.h>
61 #include <vm/vm_pager.h>
62 #include <vm/vnode_pager.h>
64 static int vop_nolookup(struct vop_lookup_args *);
65 static int vop_nostrategy(struct vop_strategy_args *);
68 * This vnode table stores what we want to do if the filesystem doesn't
69 * implement a particular VOP.
71 * If there is no specific entry here, we will return EOPNOTSUPP.
75 struct vop_vector default_vnodeops = {
77 .vop_bypass = VOP_EOPNOTSUPP,
79 .vop_advlock = vop_stdadvlock,
80 .vop_advlockasync = vop_stdadvlockasync,
81 .vop_bmap = vop_stdbmap,
82 .vop_close = VOP_NULL,
83 .vop_fsync = VOP_NULL,
84 .vop_getpages = vop_stdgetpages,
85 .vop_getwritemount = vop_stdgetwritemount,
86 .vop_inactive = VOP_NULL,
87 .vop_ioctl = VOP_ENOTTY,
88 .vop_kqfilter = vop_stdkqfilter,
89 .vop_islocked = vop_stdislocked,
90 .vop_lease = VOP_NULL,
91 .vop_lock1 = vop_stdlock,
92 .vop_lookup = vop_nolookup,
94 .vop_pathconf = VOP_EINVAL,
95 .vop_poll = vop_nopoll,
96 .vop_putpages = vop_stdputpages,
97 .vop_readlink = VOP_EINVAL,
98 .vop_revoke = VOP_PANIC,
99 .vop_strategy = vop_nostrategy,
100 .vop_unlock = vop_stdunlock,
101 .vop_vptofh = vop_stdvptofh,
105 * Series of placeholder functions for various error returns for
110 vop_eopnotsupp(struct vop_generic_args *ap)
113 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name);
120 vop_ebadf(struct vop_generic_args *ap)
127 vop_enotty(struct vop_generic_args *ap)
134 vop_einval(struct vop_generic_args *ap)
141 vop_null(struct vop_generic_args *ap)
148 * Helper function to panic on some bad VOPs in some filesystems.
151 vop_panic(struct vop_generic_args *ap)
154 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name);
158 * vop_std<something> and vop_no<something> are default functions for use by
159 * filesystems that need the "default reasonable" implementation for a
160 * particular operation.
162 * The documentation for the operations they implement exists (if it exists)
163 * in the VOP_<SOMETHING>(9) manpage (all uppercase).
167 * Default vop for filesystems that do not support name lookup
171 struct vop_lookup_args /* {
173 struct vnode **a_vpp;
174 struct componentname *a_cnp;
185 * Strategy routine for VFS devices that have none.
187 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy
188 * routine. Typically this is done for a BIO_READ strategy call.
189 * Typically B_INVAL is assumed to already be clear prior to a write
190 * and should not be cleared manually unless you just made the buffer
191 * invalid. BIO_ERROR should be cleared either way.
195 vop_nostrategy (struct vop_strategy_args *ap)
197 printf("No strategy for buffer at %p\n", ap->a_bp);
198 vprint("vnode", ap->a_vp);
199 ap->a_bp->b_ioflags |= BIO_ERROR;
200 ap->a_bp->b_error = EOPNOTSUPP;
206 * Advisory record locking support
209 vop_stdadvlock(struct vop_advlock_args *ap)
217 cred = curthread->td_ucred;
218 vn_lock(vp, LK_SHARED | LK_RETRY);
219 error = VOP_GETATTR(vp, &vattr, cred);
224 return (lf_advlock(ap, &(vp->v_lockf), vattr.va_size));
228 vop_stdadvlockasync(struct vop_advlockasync_args *ap)
236 cred = curthread->td_ucred;
237 vn_lock(vp, LK_SHARED | LK_RETRY);
238 error = VOP_GETATTR(vp, &vattr, cred);
243 return (lf_advlockasync(ap, &(vp->v_lockf), vattr.va_size));
249 * Standard implementation of POSIX pathconf, to get information about limits
251 * Override per filesystem for the case where the filesystem has smaller
256 struct vop_pathconf_args /* {
263 switch (ap->a_name) {
265 *ap->a_retval = NAME_MAX;
268 *ap->a_retval = PATH_MAX;
271 *ap->a_retval = LINK_MAX;
274 *ap->a_retval = MAX_CANON;
277 *ap->a_retval = MAX_INPUT;
280 *ap->a_retval = PIPE_BUF;
282 case _PC_CHOWN_RESTRICTED:
286 *ap->a_retval = _POSIX_VDISABLE;
295 * Standard lock, unlock and islocked functions.
299 struct vop_lock1_args /* {
306 struct vnode *vp = ap->a_vp;
308 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp),
309 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file,
316 struct vop_unlock_args /* {
321 struct vnode *vp = ap->a_vp;
323 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp)));
329 struct vop_islocked_args /* {
334 return (lockstatus(ap->a_vp->v_vnlock));
338 * Return true for select/poll.
342 struct vop_poll_args /* {
345 struct ucred *a_cred;
350 * Return true for read/write. If the user asked for something
351 * special, return POLLNVAL, so that clients have a way of
352 * determining reliably whether or not the extended
353 * functionality is present without hard-coding knowledge
354 * of specific filesystem implementations.
355 * Stay in sync with kern_conf.c::no_poll().
357 if (ap->a_events & ~POLLSTANDARD)
360 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
364 * Implement poll for local filesystems that support it.
368 struct vop_poll_args /* {
371 struct ucred *a_cred;
375 if (ap->a_events & ~POLLSTANDARD)
376 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events));
377 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
381 * Return our mount point, as we will take charge of the writes.
384 vop_stdgetwritemount(ap)
385 struct vop_getwritemount_args /* {
387 struct mount **a_mpp;
393 * XXX Since this is called unlocked we may be recycled while
394 * attempting to ref the mount. If this is the case or mountpoint
395 * will be set to NULL. We only have to prevent this call from
396 * returning with a ref to an incorrect mountpoint. It is not
397 * harmful to return with a ref to our previous mountpoint.
399 mp = ap->a_vp->v_mount;
402 if (mp != ap->a_vp->v_mount) {
411 /* XXX Needs good comment and VOP_BMAP(9) manpage */
414 struct vop_bmap_args /* {
417 struct bufobj **a_bop;
424 if (ap->a_bop != NULL)
425 *ap->a_bop = &ap->a_vp->v_bufobj;
426 if (ap->a_bnp != NULL)
427 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize);
428 if (ap->a_runp != NULL)
430 if (ap->a_runb != NULL)
437 struct vop_fsync_args /* {
439 struct ucred *a_cred;
444 struct vnode *vp = ap->a_vp;
449 int maxretry = 1000; /* large, arbitrarily chosen */
455 * MARK/SCAN initialization to avoid infinite loops.
457 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) {
458 bp->b_vflags &= ~BV_SCANNED;
463 * Flush all dirty buffers associated with a vnode.
466 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
467 if ((bp->b_vflags & BV_SCANNED) != 0)
469 bp->b_vflags |= BV_SCANNED;
470 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL))
473 KASSERT(bp->b_bufobj == bo,
474 ("bp %p wrong b_bufobj %p should be %p",
475 bp, bp->b_bufobj, bo));
476 if ((bp->b_flags & B_DELWRI) == 0)
477 panic("fsync: not dirty");
478 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) {
489 * If synchronous the caller expects us to completely resolve all
490 * dirty buffers in the system. Wait for in-progress I/O to
491 * complete (which could include background bitmap writes), then
492 * retry if dirty blocks still exist.
494 if (ap->a_waitfor == MNT_WAIT) {
495 bufobj_wwait(bo, 0, 0);
496 if (bo->bo_dirty.bv_cnt > 0) {
498 * If we are unable to write any of these buffers
499 * then we fail now rather than trying endlessly
502 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs)
503 if ((error = bp->b_error) == 0)
505 if (error == 0 && --maxretry >= 0)
512 vprint("fsync: giving up on dirty", vp);
517 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */
520 struct vop_getpages_args /* {
525 vm_ooffset_t a_offset;
529 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
530 ap->a_count, ap->a_reqpage);
534 vop_stdkqfilter(struct vop_kqfilter_args *ap)
536 return vfs_kqfilter(ap);
539 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */
542 struct vop_putpages_args /* {
548 vm_ooffset_t a_offset;
552 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count,
553 ap->a_sync, ap->a_rtvals);
557 vop_stdvptofh(struct vop_vptofh_args *ap)
564 * used to fill the vfs function table to get reasonable default return values.
567 vfs_stdroot (mp, flags, vpp, td)
578 vfs_stdstatfs (mp, sbp, td)
588 vfs_stdquotactl (mp, cmds, uid, arg, td)
600 vfs_stdsync(mp, waitfor, td)
605 struct vnode *vp, *mvp;
606 int error, lockreq, allerror = 0;
608 lockreq = LK_EXCLUSIVE | LK_INTERLOCK;
609 if (waitfor != MNT_WAIT)
610 lockreq |= LK_NOWAIT;
612 * Force stale buffer cache information to be flushed.
616 MNT_VNODE_FOREACH(vp, mp, mvp) {
617 /* bv_cnt is an acceptable race here. */
618 if (vp->v_bufobj.bo_dirty.bv_cnt == 0)
622 if ((error = vget(vp, lockreq, td)) != 0) {
624 if (error == ENOENT) {
625 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
630 error = VOP_FSYNC(vp, waitfor, td);
634 /* Do not turn this into vput. td is not always curthread. */
644 vfs_stdnosync (mp, waitfor, td)
654 vfs_stdvget (mp, ino, flags, vpp)
665 vfs_stdfhtovp (mp, fhp, vpp)
676 struct vfsconf *vfsp;
684 struct vfsconf *vfsp;
691 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td)
694 struct vnode *filename_vp;
696 const char *attrname;
700 if (filename_vp != NULL)
701 VOP_UNLOCK(filename_vp, 0);
706 vfs_stdsysctl(mp, op, req)
709 struct sysctl_req *req;
715 /* end of vfs default ops */