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38 * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/kern/vfs_vnops.c,v 1.87.2.13 2002/12/29 18:19:53 dillon Exp $
40 * $DragonFly: src/sys/kern/vfs_vnops.c,v 1.58 2008/06/28 17:59:49 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/fcntl.h>
50 #include <sys/mount.h>
51 #include <sys/nlookup.h>
52 #include <sys/vnode.h>
54 #include <sys/filio.h>
55 #include <sys/ttycom.h>
57 #include <sys/syslog.h>
59 static int vn_closefile (struct file *fp);
60 static int vn_ioctl (struct file *fp, u_long com, caddr_t data,
62 static int vn_read (struct file *fp, struct uio *uio,
63 struct ucred *cred, int flags);
64 static int svn_read (struct file *fp, struct uio *uio,
65 struct ucred *cred, int flags);
66 static int vn_poll (struct file *fp, int events, struct ucred *cred);
67 static int vn_kqfilter (struct file *fp, struct knote *kn);
68 static int vn_statfile (struct file *fp, struct stat *sb, struct ucred *cred);
69 static int vn_write (struct file *fp, struct uio *uio,
70 struct ucred *cred, int flags);
71 static int svn_write (struct file *fp, struct uio *uio,
72 struct ucred *cred, int flags);
74 struct fileops vnode_fileops = {
79 .fo_kqfilter = vn_kqfilter,
80 .fo_stat = vn_statfile,
81 .fo_close = vn_closefile,
82 .fo_shutdown = nofo_shutdown
85 struct fileops specvnode_fileops = {
87 .fo_write = svn_write,
90 .fo_kqfilter = vn_kqfilter,
91 .fo_stat = vn_statfile,
92 .fo_close = vn_closefile,
93 .fo_shutdown = nofo_shutdown
97 * Shortcut the device read/write. This avoids a lot of vnode junk.
98 * Basically the specfs vnops for read and write take the locked vnode,
99 * unlock it (because we can't hold the vnode locked while reading or writing
100 * a device which may block indefinitely), issues the device operation, then
101 * relock the vnode before returning, plus other junk. This bypasses all
102 * of that and just does the device operation.
105 vn_setspecops(struct file *fp)
107 if (vfs_fastdev && fp->f_ops == &vnode_fileops) {
108 fp->f_ops = &specvnode_fileops;
113 * Common code for vnode open operations. Check permissions, and call
114 * the VOP_NOPEN or VOP_NCREATE routine.
116 * The caller is responsible for setting up nd with nlookup_init() and
117 * for cleaning it up with nlookup_done(), whether we return an error
120 * On success nd->nl_open_vp will hold a referenced and, if requested,
121 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
122 * is non-NULL the vnode will be installed in the file pointer.
124 * NOTE: The vnode is referenced just once on return whether or not it
125 * is also installed in the file pointer.
128 vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode)
131 struct ucred *cred = nd->nl_cred;
133 struct vattr *vap = &vat;
137 * Lookup the path and create or obtain the vnode. After a
138 * successful lookup a locked nd->nl_nch will be returned.
140 * The result of this section should be a locked vnode.
142 * XXX with only a little work we should be able to avoid locking
143 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
145 nd->nl_flags |= NLC_OPEN;
146 if (fmode & O_APPEND)
147 nd->nl_flags |= NLC_APPEND;
149 nd->nl_flags |= NLC_TRUNCATE;
151 nd->nl_flags |= NLC_READ;
153 nd->nl_flags |= NLC_WRITE;
155 if (fmode & O_CREAT) {
157 * CONDITIONAL CREATE FILE CASE
159 * Setting NLC_CREATE causes a negative hit to store
160 * the negative hit ncp and not return an error. Then
161 * nc_error or nc_vp may be checked to see if the ncp
162 * represents a negative hit. NLC_CREATE also requires
163 * write permission on the governing directory or EPERM
166 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
167 nd->nl_flags |= NLC_FOLLOW;
168 nd->nl_flags |= NLC_CREATE;
169 nd->nl_flags |= NLC_REFDVP;
174 * NORMAL OPEN FILE CASE
183 * split case to allow us to re-resolve and retry the ncp in case
187 if (fmode & O_CREAT) {
188 if (nd->nl_nch.ncp->nc_vp == NULL) {
189 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
193 vap->va_mode = cmode;
195 vap->va_vaflags |= VA_EXCLUSIVE;
196 error = VOP_NCREATE(&nd->nl_nch, nd->nl_dvp, &vp,
201 /* locked vnode is returned */
203 if (fmode & O_EXCL) {
206 error = cache_vget(&nd->nl_nch, cred,
214 error = cache_vget(&nd->nl_nch, cred, LK_EXCLUSIVE, &vp);
220 * We have a locked vnode and ncp now. Note that the ncp will
221 * be cleaned up by the caller if nd->nl_nch is left intact.
223 if (vp->v_type == VLNK) {
227 if (vp->v_type == VSOCK) {
231 if ((fmode & O_CREAT) == 0) {
232 if (fmode & (FWRITE | O_TRUNC)) {
233 if (vp->v_type == VDIR) {
237 error = vn_writechk(vp, &nd->nl_nch);
240 * Special stale handling, re-resolve the
243 if (error == ESTALE) {
246 cache_setunresolved(&nd->nl_nch);
247 error = cache_resolve(&nd->nl_nch, cred);
255 if (fmode & O_TRUNC) {
256 vn_unlock(vp); /* XXX */
257 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
260 error = VOP_SETATTR(vp, vap, cred);
266 * Setup the fp so VOP_OPEN can override it. No descriptor has been
267 * associated with the fp yet so we own it clean.
269 * f_nchandle inherits nl_nch. This used to be necessary only for
270 * directories but now we do it unconditionally so f*() ops
271 * such as fchmod() can access the actual namespace that was
272 * used to open the file.
275 if (nd->nl_flags & NLC_APPENDONLY)
276 fmode |= FAPPENDONLY;
277 fp->f_nchandle = nd->nl_nch;
278 cache_zero(&nd->nl_nch);
279 cache_unlock(&fp->f_nchandle);
283 * Get rid of nl_nch. vn_open does not return it (it returns the
284 * vnode or the file pointer). Note: we can't leave nl_nch locked
285 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
289 cache_put(&nd->nl_nch);
291 error = VOP_OPEN(vp, fmode, cred, fp);
294 * setting f_ops to &badfileops will prevent the descriptor
295 * code from trying to close and release the vnode, since
296 * the open failed we do not want to call close.
300 fp->f_ops = &badfileops;
307 * Assert that VREG files have been setup for vmio.
309 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
310 ("vn_open: regular file was not VMIO enabled!"));
314 * Return the vnode. XXX needs some cleaning up. The vnode is
315 * only returned in the fp == NULL case.
319 nd->nl_vp_fmode = fmode;
320 if ((nd->nl_flags & NLC_LOCKVP) == 0)
333 vn_opendisk(const char *devname, int fmode, struct vnode **vpp)
338 if (strncmp(devname, "/dev/", 5) == 0)
340 if ((vp = getsynthvnode(devname)) == NULL) {
343 error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL);
355 * Check for write permissions on the specified vnode. nch may be NULL.
358 vn_writechk(struct vnode *vp, struct nchandle *nch)
361 * If there's shared text associated with
362 * the vnode, try to free it up once. If
363 * we fail, we can't allow writing.
365 if (vp->v_flag & VTEXT)
369 * If the vnode represents a regular file, check the mount
370 * point via the nch. This may be a different mount point
371 * then the one embedded in the vnode (e.g. nullfs).
373 * We can still write to non-regular files (e.g. devices)
374 * via read-only mounts.
376 if (nch && nch->ncp && vp->v_type == VREG)
377 return (ncp_writechk(nch));
382 * Check whether the underlying mount is read-only. The mount point
383 * referenced by the namecache may be different from the mount point
384 * used by the underlying vnode in the case of NULLFS, so a separate
388 ncp_writechk(struct nchandle *nch)
390 if (nch->mount && (nch->mount->mnt_flag & MNT_RDONLY))
399 vn_close(struct vnode *vp, int flags)
403 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
405 error = VOP_CLOSE(vp, flags);
414 sequential_heuristic(struct uio *uio, struct file *fp)
417 * Sequential heuristic - detect sequential operation
419 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
420 uio->uio_offset == fp->f_nextoff) {
421 int tmpseq = fp->f_seqcount;
423 * XXX we assume that the filesystem block size is
424 * the default. Not true, but still gives us a pretty
425 * good indicator of how sequential the read operations
428 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
429 if (tmpseq > IO_SEQMAX)
431 fp->f_seqcount = tmpseq;
432 return(fp->f_seqcount << IO_SEQSHIFT);
436 * Not sequential, quick draw-down of seqcount
438 if (fp->f_seqcount > 1)
446 * Package up an I/O request on a vnode into a uio and do it.
449 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
450 off_t offset, enum uio_seg segflg, int ioflg,
451 struct ucred *cred, int *aresid)
455 struct ccms_lock ccms_lock;
458 if ((ioflg & IO_NODELOCKED) == 0)
459 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
460 auio.uio_iov = &aiov;
462 aiov.iov_base = base;
464 auio.uio_resid = len;
465 auio.uio_offset = offset;
466 auio.uio_segflg = segflg;
468 auio.uio_td = curthread;
469 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, &auio);
470 if (rw == UIO_READ) {
471 error = VOP_READ(vp, &auio, ioflg, cred);
473 error = VOP_WRITE(vp, &auio, ioflg, cred);
475 ccms_lock_put(&vp->v_ccms, &ccms_lock);
477 *aresid = auio.uio_resid;
479 if (auio.uio_resid && error == 0)
481 if ((ioflg & IO_NODELOCKED) == 0)
487 * Package up an I/O request on a vnode into a uio and do it. The I/O
488 * request is split up into smaller chunks and we try to avoid saturating
489 * the buffer cache while potentially holding a vnode locked, so we
490 * check bwillwrite() before calling vn_rdwr(). We also call uio_yield()
491 * to give other processes a chance to lock the vnode (either other processes
492 * core'ing the same binary, or unrelated processes scanning the directory).
495 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
496 off_t offset, enum uio_seg segflg, int ioflg,
497 struct ucred *cred, int *aresid)
505 * Force `offset' to a multiple of MAXBSIZE except possibly
506 * for the first chunk, so that filesystems only need to
507 * write full blocks except possibly for the first and last
510 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
514 if (vp->v_type == VREG) {
524 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
525 ioflg, cred, aresid);
526 len -= chunk; /* aresid calc already includes length */
539 * MPALMOSTSAFE - acquires mplock
542 vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
544 struct ccms_lock ccms_lock;
549 KASSERT(uio->uio_td == curthread,
550 ("uio_td %p is not td %p", uio->uio_td, curthread));
551 vp = (struct vnode *)fp->f_data;
554 if (flags & O_FBLOCKING) {
555 /* ioflag &= ~IO_NDELAY; */
556 } else if (flags & O_FNONBLOCKING) {
558 } else if (fp->f_flag & FNONBLOCK) {
561 if (flags & O_FBUFFERED) {
562 /* ioflag &= ~IO_DIRECT; */
563 } else if (flags & O_FUNBUFFERED) {
565 } else if (fp->f_flag & O_DIRECT) {
568 vn_lock(vp, LK_SHARED | LK_RETRY);
569 if ((flags & O_FOFFSET) == 0)
570 uio->uio_offset = fp->f_offset;
571 ioflag |= sequential_heuristic(uio, fp);
573 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio);
574 error = VOP_READ(vp, uio, ioflag, cred);
575 ccms_lock_put(&vp->v_ccms, &ccms_lock);
576 if ((flags & O_FOFFSET) == 0)
577 fp->f_offset = uio->uio_offset;
578 fp->f_nextoff = uio->uio_offset;
585 * Device-optimized file table vnode read routine.
587 * This bypasses the VOP table and talks directly to the device. Most
588 * filesystems just route to specfs and can make this optimization.
590 * MPALMOSTSAFE - acquires mplock
593 svn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
601 KASSERT(uio->uio_td == curthread,
602 ("uio_td %p is not td %p", uio->uio_td, curthread));
604 vp = (struct vnode *)fp->f_data;
605 if (vp == NULL || vp->v_type == VBAD) {
610 if ((dev = vp->v_rdev) == NULL) {
616 if (uio->uio_resid == 0) {
620 if ((flags & O_FOFFSET) == 0)
621 uio->uio_offset = fp->f_offset;
624 if (flags & O_FBLOCKING) {
625 /* ioflag &= ~IO_NDELAY; */
626 } else if (flags & O_FNONBLOCKING) {
628 } else if (fp->f_flag & FNONBLOCK) {
631 if (flags & O_FBUFFERED) {
632 /* ioflag &= ~IO_DIRECT; */
633 } else if (flags & O_FUNBUFFERED) {
635 } else if (fp->f_flag & O_DIRECT) {
638 ioflag |= sequential_heuristic(uio, fp);
640 error = dev_dread(dev, uio, ioflag);
643 if ((flags & O_FOFFSET) == 0)
644 fp->f_offset = uio->uio_offset;
645 fp->f_nextoff = uio->uio_offset;
652 * MPALMOSTSAFE - acquires mplock
655 vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
657 struct ccms_lock ccms_lock;
662 KASSERT(uio->uio_td == curthread,
663 ("uio_td %p is not p %p", uio->uio_td, curthread));
664 vp = (struct vnode *)fp->f_data;
666 /* VOP_WRITE should handle this now */
667 if (vp->v_type == VREG || vp->v_type == VDATABASE)
670 vp = (struct vnode *)fp->f_data; /* XXX needed? */
673 if (vp->v_type == VREG &&
674 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
678 if (flags & O_FBLOCKING) {
679 /* ioflag &= ~IO_NDELAY; */
680 } else if (flags & O_FNONBLOCKING) {
682 } else if (fp->f_flag & FNONBLOCK) {
685 if (flags & O_FBUFFERED) {
686 /* ioflag &= ~IO_DIRECT; */
687 } else if (flags & O_FUNBUFFERED) {
689 } else if (fp->f_flag & O_DIRECT) {
692 if (flags & O_FASYNCWRITE) {
693 /* ioflag &= ~IO_SYNC; */
694 } else if (flags & O_FSYNCWRITE) {
696 } else if (fp->f_flag & O_FSYNC) {
700 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
702 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
703 if ((flags & O_FOFFSET) == 0)
704 uio->uio_offset = fp->f_offset;
705 ioflag |= sequential_heuristic(uio, fp);
706 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio);
707 error = VOP_WRITE(vp, uio, ioflag, cred);
708 ccms_lock_put(&vp->v_ccms, &ccms_lock);
709 if ((flags & O_FOFFSET) == 0)
710 fp->f_offset = uio->uio_offset;
711 fp->f_nextoff = uio->uio_offset;
718 * Device-optimized file table vnode write routine.
720 * This bypasses the VOP table and talks directly to the device. Most
721 * filesystems just route to specfs and can make this optimization.
723 * MPALMOSTSAFE - acquires mplock
726 svn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
734 KASSERT(uio->uio_td == curthread,
735 ("uio_td %p is not p %p", uio->uio_td, curthread));
737 vp = (struct vnode *)fp->f_data;
738 if (vp == NULL || vp->v_type == VBAD) {
742 if (vp->v_type == VREG)
743 bwillwrite(uio->uio_resid);
744 vp = (struct vnode *)fp->f_data; /* XXX needed? */
746 if ((dev = vp->v_rdev) == NULL) {
752 if ((flags & O_FOFFSET) == 0)
753 uio->uio_offset = fp->f_offset;
756 if (vp->v_type == VREG &&
757 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
761 if (flags & O_FBLOCKING) {
762 /* ioflag &= ~IO_NDELAY; */
763 } else if (flags & O_FNONBLOCKING) {
765 } else if (fp->f_flag & FNONBLOCK) {
768 if (flags & O_FBUFFERED) {
769 /* ioflag &= ~IO_DIRECT; */
770 } else if (flags & O_FUNBUFFERED) {
772 } else if (fp->f_flag & O_DIRECT) {
775 if (flags & O_FASYNCWRITE) {
776 /* ioflag &= ~IO_SYNC; */
777 } else if (flags & O_FSYNCWRITE) {
779 } else if (fp->f_flag & O_FSYNC) {
783 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
785 ioflag |= sequential_heuristic(uio, fp);
787 error = dev_dwrite(dev, uio, ioflag);
790 if ((flags & O_FOFFSET) == 0)
791 fp->f_offset = uio->uio_offset;
792 fp->f_nextoff = uio->uio_offset;
799 * MPALMOSTSAFE - acquires mplock
802 vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred)
808 vp = (struct vnode *)fp->f_data;
809 error = vn_stat(vp, sb, cred);
815 vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred)
824 error = VOP_GETATTR(vp, vap);
829 * Zero the spare stat fields
835 * Copy from vattr table
837 if (vap->va_fsid != VNOVAL)
838 sb->st_dev = vap->va_fsid;
840 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
841 sb->st_ino = vap->va_fileid;
843 switch (vap->va_type) {
861 /* This is a cosmetic change, symlinks do not have a mode. */
862 if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW)
863 sb->st_mode &= ~ACCESSPERMS; /* 0000 */
865 sb->st_mode |= ACCESSPERMS; /* 0777 */
877 if (vap->va_nlink > (nlink_t)-1)
878 sb->st_nlink = (nlink_t)-1;
880 sb->st_nlink = vap->va_nlink;
881 sb->st_uid = vap->va_uid;
882 sb->st_gid = vap->va_gid;
883 sb->st_rdev = makeudev(vap->va_rmajor, vap->va_rminor);
884 sb->st_size = vap->va_size;
885 sb->st_atimespec = vap->va_atime;
886 sb->st_mtimespec = vap->va_mtime;
887 sb->st_ctimespec = vap->va_ctime;
890 * A VCHR and VBLK device may track the last access and last modified
891 * time independantly of the filesystem. This is particularly true
892 * because device read and write calls may bypass the filesystem.
894 if (vp->v_type == VCHR || vp->v_type == VBLK) {
897 if (dev->si_lastread) {
898 sb->st_atimespec.tv_sec = dev->si_lastread;
899 sb->st_atimespec.tv_nsec = 0;
901 if (dev->si_lastwrite) {
902 sb->st_atimespec.tv_sec = dev->si_lastwrite;
903 sb->st_atimespec.tv_nsec = 0;
909 * According to www.opengroup.org, the meaning of st_blksize is
910 * "a filesystem-specific preferred I/O block size for this
911 * object. In some filesystem types, this may vary from file
913 * Default to PAGE_SIZE after much discussion.
916 if (vap->va_type == VREG) {
917 sb->st_blksize = vap->va_blocksize;
918 } else if (vn_isdisk(vp, NULL)) {
920 * XXX this is broken. If the device is not yet open (aka
921 * stat() call, aka v_rdev == NULL), how are we supposed
922 * to get a valid block size out of it?
925 if (dev == NULL && vp->v_type == VCHR) {
926 dev = get_dev(vp->v_umajor, vp->v_uminor);
928 sb->st_blksize = dev->si_bsize_best;
929 if (sb->st_blksize < dev->si_bsize_phys)
930 sb->st_blksize = dev->si_bsize_phys;
931 if (sb->st_blksize < BLKDEV_IOSIZE)
932 sb->st_blksize = BLKDEV_IOSIZE;
934 sb->st_blksize = PAGE_SIZE;
937 sb->st_flags = vap->va_flags;
939 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0);
943 sb->st_gen = (u_int32_t)vap->va_gen;
945 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
946 sb->st_fsmid = vap->va_fsmid;
951 * MPALMOSTSAFE - acquires mplock
954 vn_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred)
956 struct vnode *vp = ((struct vnode *)fp->f_data);
963 switch (vp->v_type) {
966 if (com == FIONREAD) {
967 error = VOP_GETATTR(vp, &vattr);
970 *(int *)data = vattr.va_size - fp->f_offset;
974 if (com == FIOASYNC) { /* XXX */
986 if (com == FIODTYPE) {
987 if (vp->v_type != VCHR && vp->v_type != VBLK) {
991 *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK;
995 error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred);
996 if (error == 0 && com == TIOCSCTTY) {
997 struct proc *p = curthread->td_proc;
998 struct session *sess;
1005 sess = p->p_session;
1006 /* Do nothing if reassigning same control tty */
1007 if (sess->s_ttyvp == vp) {
1012 /* Get rid of reference to old control tty */
1013 ovp = sess->s_ttyvp;
1026 * MPALMOSTSAFE - acquires mplock
1029 vn_poll(struct file *fp, int events, struct ucred *cred)
1034 error = VOP_POLL(((struct vnode *)fp->f_data), events, cred);
1040 * Check that the vnode is still valid, and if so
1041 * acquire requested lock.
1045 vn_lock(struct vnode *vp, int flags)
1047 debug_vn_lock(struct vnode *vp, int flags, const char *filename, int line)
1054 vp->filename = filename;
1056 error = debuglockmgr(&vp->v_lock, flags,
1057 "vn_lock", filename, line);
1059 error = lockmgr(&vp->v_lock, flags);
1063 } while (flags & LK_RETRY);
1066 * Because we (had better!) have a ref on the vnode, once it
1067 * goes to VRECLAIMED state it will not be recycled until all
1068 * refs go away. So we can just check the flag.
1070 if (error == 0 && (vp->v_flag & VRECLAIMED)) {
1071 lockmgr(&vp->v_lock, LK_RELEASE);
1078 vn_unlock(struct vnode *vp)
1080 lockmgr(&vp->v_lock, LK_RELEASE);
1084 vn_islocked(struct vnode *vp)
1086 return (lockstatus(&vp->v_lock, curthread));
1090 * MPALMOSTSAFE - acquires mplock
1093 vn_closefile(struct file *fp)
1098 fp->f_ops = &badfileops;
1099 error = vn_close(((struct vnode *)fp->f_data), fp->f_flag);
1105 * MPALMOSTSAFE - acquires mplock
1108 vn_kqfilter(struct file *fp, struct knote *kn)
1113 error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn);