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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 1.52 2007/07/30 08:02:38 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/fcntl.h>
49 #include <sys/mount.h>
50 #include <sys/nlookup.h>
51 #include <sys/vnode.h>
53 #include <sys/filio.h>
54 #include <sys/ttycom.h>
56 #include <sys/syslog.h>
58 static int vn_closefile (struct file *fp);
59 static int vn_ioctl (struct file *fp, u_long com, caddr_t data,
61 static int vn_read (struct file *fp, struct uio *uio,
62 struct ucred *cred, int flags);
63 static int svn_read (struct file *fp, struct uio *uio,
64 struct ucred *cred, int flags);
65 static int vn_poll (struct file *fp, int events, struct ucred *cred);
66 static int vn_kqfilter (struct file *fp, struct knote *kn);
67 static int vn_statfile (struct file *fp, struct stat *sb, struct ucred *cred);
68 static int vn_write (struct file *fp, struct uio *uio,
69 struct ucred *cred, int flags);
70 static int svn_write (struct file *fp, struct uio *uio,
71 struct ucred *cred, int flags);
73 struct fileops vnode_fileops = {
78 .fo_kqfilter = vn_kqfilter,
79 .fo_stat = vn_statfile,
80 .fo_close = vn_closefile,
81 .fo_shutdown = nofo_shutdown
84 struct fileops specvnode_fileops = {
86 .fo_write = svn_write,
89 .fo_kqfilter = vn_kqfilter,
90 .fo_stat = vn_statfile,
91 .fo_close = vn_closefile,
92 .fo_shutdown = nofo_shutdown
96 * Shortcut the device read/write. This avoids a lot of vnode junk.
97 * Basically the specfs vnops for read and write take the locked vnode,
98 * unlock it (because we can't hold the vnode locked while reading or writing
99 * a device which may block indefinitely), issues the device operation, then
100 * relock the vnode before returning, plus other junk. This bypasses all
101 * of that and just does the device operation.
104 vn_setspecops(struct file *fp)
106 if (vfs_fastdev && fp->f_ops == &vnode_fileops) {
107 fp->f_ops = &specvnode_fileops;
112 * Common code for vnode open operations. Check permissions, and call
113 * the VOP_NOPEN or VOP_NCREATE routine.
115 * The caller is responsible for setting up nd with nlookup_init() and
116 * for cleaning it up with nlookup_done(), whether we return an error
119 * On success nd->nl_open_vp will hold a referenced and, if requested,
120 * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
121 * is non-NULL the vnode will be installed in the file pointer.
123 * NOTE: The vnode is referenced just once on return whether or not it
124 * is also installed in the file pointer.
127 vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode)
130 struct ucred *cred = nd->nl_cred;
132 struct vattr *vap = &vat;
136 * Lookup the path and create or obtain the vnode. After a
137 * successful lookup a locked nd->nl_nch will be returned.
139 * The result of this section should be a locked vnode.
141 * XXX with only a little work we should be able to avoid locking
142 * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
144 if (fmode & O_CREAT) {
146 * CONDITIONAL CREATE FILE CASE
148 * Setting NLC_CREATE causes a negative hit to store
149 * the negative hit ncp and not return an error. Then
150 * nc_error or nc_vp may be checked to see if the ncp
151 * represents a negative hit. NLC_CREATE also requires
152 * write permission on the governing directory or EPERM
155 if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
156 nd->nl_flags |= NLC_FOLLOW;
157 nd->nl_flags |= NLC_CREATE;
162 * NORMAL OPEN FILE CASE
171 * split case to allow us to re-resolve and retry the ncp in case
175 if (fmode & O_CREAT) {
176 if (nd->nl_nch.ncp->nc_vp == NULL) {
177 if ((error = ncp_writechk(&nd->nl_nch)) != 0)
181 vap->va_mode = cmode;
183 vap->va_vaflags |= VA_EXCLUSIVE;
184 error = VOP_NCREATE(&nd->nl_nch, &vp, nd->nl_cred, vap);
188 /* locked vnode is returned */
190 if (fmode & O_EXCL) {
193 error = cache_vget(&nd->nl_nch, cred,
201 error = cache_vget(&nd->nl_nch, cred, LK_EXCLUSIVE, &vp);
207 * We have a locked vnode and ncp now. Note that the ncp will
208 * be cleaned up by the caller if nd->nl_nch is left intact.
210 if (vp->v_type == VLNK) {
214 if (vp->v_type == VSOCK) {
218 if ((fmode & O_CREAT) == 0) {
220 if (fmode & (FWRITE | O_TRUNC)) {
221 if (vp->v_type == VDIR) {
225 error = vn_writechk(vp, &nd->nl_nch);
228 * Special stale handling, re-resolve the
231 if (error == ESTALE) {
234 cache_setunresolved(&nd->nl_nch);
235 error = cache_resolve(&nd->nl_nch, cred);
246 error = VOP_ACCESS(vp, mode, cred);
249 * Special stale handling, re-resolve the
252 if (error == ESTALE) {
255 cache_setunresolved(&nd->nl_nch);
256 error = cache_resolve(&nd->nl_nch, cred);
264 if (fmode & O_TRUNC) {
265 vn_unlock(vp); /* XXX */
266 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
269 error = VOP_SETATTR(vp, vap, cred);
275 * Setup the fp so VOP_OPEN can override it. No descriptor has been
276 * associated with the fp yet so we own it clean.
278 * f_nchandle inherits nl_nch. This used to be necessary only for
279 * directories but now we do it unconditionally so f*() ops
280 * such as fchmod() can access the actual namespace that was
281 * used to open the file.
284 fp->f_nchandle = nd->nl_nch;
285 cache_zero(&nd->nl_nch);
286 cache_unlock(&fp->f_nchandle);
290 * Get rid of nl_nch. vn_open does not return it (it returns the
291 * vnode or the file pointer). Note: we can't leave nl_nch locked
292 * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
296 cache_put(&nd->nl_nch);
298 error = VOP_OPEN(vp, fmode, cred, fp);
301 * setting f_ops to &badfileops will prevent the descriptor
302 * code from trying to close and release the vnode, since
303 * the open failed we do not want to call close.
307 fp->f_ops = &badfileops;
314 * Assert that VREG files have been setup for vmio.
316 KASSERT(vp->v_type != VREG || vp->v_object != NULL,
317 ("vn_open: regular file was not VMIO enabled!"));
321 * Return the vnode. XXX needs some cleaning up. The vnode is
322 * only returned in the fp == NULL case.
326 nd->nl_vp_fmode = fmode;
327 if ((nd->nl_flags & NLC_LOCKVP) == 0)
340 vn_opendisk(const char *devname, int fmode, struct vnode **vpp)
345 if (strncmp(devname, "/dev/", 5) == 0)
347 if ((vp = getsynthvnode(devname)) == NULL) {
350 error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL);
362 * Check for write permissions on the specified vnode. nch may be NULL.
365 vn_writechk(struct vnode *vp, struct nchandle *nch)
368 * If there's shared text associated with
369 * the vnode, try to free it up once. If
370 * we fail, we can't allow writing.
372 if (vp->v_flag & VTEXT)
376 * If the vnode represents a regular file, check the mount
377 * point via the nch. This may be a different mount point
378 * then the one embedded in the vnode (e.g. nullfs).
380 * We can still write to non-regular files (e.g. devices)
381 * via read-only mounts.
383 if (nch && nch->ncp && vp->v_type == VREG)
384 return (ncp_writechk(nch));
389 * Check whether the underlying mount is read-only. The mount point
390 * referenced by the namecache may be different from the mount point
391 * used by the underlying vnode in the case of NULLFS, so a separate
395 ncp_writechk(struct nchandle *nch)
397 if (nch->mount && (nch->mount->mnt_flag & MNT_RDONLY))
406 vn_close(struct vnode *vp, int flags)
410 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) == 0) {
411 error = VOP_CLOSE(vp, flags);
420 sequential_heuristic(struct uio *uio, struct file *fp)
423 * Sequential heuristic - detect sequential operation
425 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) ||
426 uio->uio_offset == fp->f_nextoff) {
427 int tmpseq = fp->f_seqcount;
429 * XXX we assume that the filesystem block size is
430 * the default. Not true, but still gives us a pretty
431 * good indicator of how sequential the read operations
434 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE;
435 if (tmpseq > IO_SEQMAX)
437 fp->f_seqcount = tmpseq;
438 return(fp->f_seqcount << IO_SEQSHIFT);
442 * Not sequential, quick draw-down of seqcount
444 if (fp->f_seqcount > 1)
452 * Package up an I/O request on a vnode into a uio and do it.
455 vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
456 off_t offset, enum uio_seg segflg, int ioflg,
457 struct ucred *cred, int *aresid)
461 struct ccms_lock ccms_lock;
464 if ((ioflg & IO_NODELOCKED) == 0)
465 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
466 auio.uio_iov = &aiov;
468 aiov.iov_base = base;
470 auio.uio_resid = len;
471 auio.uio_offset = offset;
472 auio.uio_segflg = segflg;
474 auio.uio_td = curthread;
475 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, &auio);
476 if (rw == UIO_READ) {
477 error = VOP_READ(vp, &auio, ioflg, cred);
479 error = VOP_WRITE(vp, &auio, ioflg, cred);
481 ccms_lock_put(&vp->v_ccms, &ccms_lock);
483 *aresid = auio.uio_resid;
485 if (auio.uio_resid && error == 0)
487 if ((ioflg & IO_NODELOCKED) == 0)
493 * Package up an I/O request on a vnode into a uio and do it. The I/O
494 * request is split up into smaller chunks and we try to avoid saturating
495 * the buffer cache while potentially holding a vnode locked, so we
496 * check bwillwrite() before calling vn_rdwr(). We also call uio_yield()
497 * to give other processes a chance to lock the vnode (either other processes
498 * core'ing the same binary, or unrelated processes scanning the directory).
501 vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len,
502 off_t offset, enum uio_seg segflg, int ioflg,
503 struct ucred *cred, int *aresid)
511 * Force `offset' to a multiple of MAXBSIZE except possibly
512 * for the first chunk, so that filesystems only need to
513 * write full blocks except possibly for the first and last
516 chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE;
520 if (rw != UIO_READ && vp->v_type == VREG)
522 error = vn_rdwr(rw, vp, base, chunk, offset, segflg,
523 ioflg, cred, aresid);
524 len -= chunk; /* aresid calc already includes length */
537 * MPALMOSTSAFE - acquires mplock
540 vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
542 struct ccms_lock ccms_lock;
547 KASSERT(uio->uio_td == curthread,
548 ("uio_td %p is not td %p", uio->uio_td, curthread));
549 vp = (struct vnode *)fp->f_data;
552 if (flags & O_FBLOCKING) {
553 /* ioflag &= ~IO_NDELAY; */
554 } else if (flags & O_FNONBLOCKING) {
556 } else if (fp->f_flag & FNONBLOCK) {
559 if (flags & O_FBUFFERED) {
560 /* ioflag &= ~IO_DIRECT; */
561 } else if (flags & O_FUNBUFFERED) {
563 } else if (fp->f_flag & O_DIRECT) {
566 vn_lock(vp, LK_SHARED | LK_RETRY);
567 if ((flags & O_FOFFSET) == 0)
568 uio->uio_offset = fp->f_offset;
569 ioflag |= sequential_heuristic(uio, fp);
571 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio);
572 error = VOP_READ(vp, uio, ioflag, cred);
573 ccms_lock_put(&vp->v_ccms, &ccms_lock);
574 if ((flags & O_FOFFSET) == 0)
575 fp->f_offset = uio->uio_offset;
576 fp->f_nextoff = uio->uio_offset;
583 * Device-optimized file table vnode read routine.
585 * This bypasses the VOP table and talks directly to the device. Most
586 * filesystems just route to specfs and can make this optimization.
588 * MPALMOSTSAFE - acquires mplock
591 svn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
599 KASSERT(uio->uio_td == curthread,
600 ("uio_td %p is not td %p", uio->uio_td, curthread));
602 vp = (struct vnode *)fp->f_data;
603 if (vp == NULL || vp->v_type == VBAD) {
608 if ((dev = vp->v_rdev) == NULL) {
614 if (uio->uio_resid == 0) {
618 if ((flags & O_FOFFSET) == 0)
619 uio->uio_offset = fp->f_offset;
622 if (flags & O_FBLOCKING) {
623 /* ioflag &= ~IO_NDELAY; */
624 } else if (flags & O_FNONBLOCKING) {
626 } else if (fp->f_flag & FNONBLOCK) {
629 if (flags & O_FBUFFERED) {
630 /* ioflag &= ~IO_DIRECT; */
631 } else if (flags & O_FUNBUFFERED) {
633 } else if (fp->f_flag & O_DIRECT) {
636 ioflag |= sequential_heuristic(uio, fp);
638 error = dev_dread(dev, uio, ioflag);
641 if ((flags & O_FOFFSET) == 0)
642 fp->f_offset = uio->uio_offset;
643 fp->f_nextoff = uio->uio_offset;
650 * MPALMOSTSAFE - acquires mplock
653 vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
655 struct ccms_lock ccms_lock;
660 KASSERT(uio->uio_td == curthread,
661 ("uio_td %p is not p %p", uio->uio_td, curthread));
662 vp = (struct vnode *)fp->f_data;
663 if (vp->v_type == VREG)
665 vp = (struct vnode *)fp->f_data; /* XXX needed? */
668 if (vp->v_type == VREG &&
669 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
673 if (flags & O_FBLOCKING) {
674 /* ioflag &= ~IO_NDELAY; */
675 } else if (flags & O_FNONBLOCKING) {
677 } else if (fp->f_flag & FNONBLOCK) {
680 if (flags & O_FBUFFERED) {
681 /* ioflag &= ~IO_DIRECT; */
682 } else if (flags & O_FUNBUFFERED) {
684 } else if (fp->f_flag & O_DIRECT) {
687 if (flags & O_FASYNCWRITE) {
688 /* ioflag &= ~IO_SYNC; */
689 } else if (flags & O_FSYNCWRITE) {
691 } else if (fp->f_flag & O_FSYNC) {
695 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
697 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
698 if ((flags & O_FOFFSET) == 0)
699 uio->uio_offset = fp->f_offset;
700 ioflag |= sequential_heuristic(uio, fp);
701 ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio);
702 error = VOP_WRITE(vp, uio, ioflag, cred);
703 ccms_lock_put(&vp->v_ccms, &ccms_lock);
704 if ((flags & O_FOFFSET) == 0)
705 fp->f_offset = uio->uio_offset;
706 fp->f_nextoff = uio->uio_offset;
713 * Device-optimized file table vnode write routine.
715 * This bypasses the VOP table and talks directly to the device. Most
716 * filesystems just route to specfs and can make this optimization.
718 * MPALMOSTSAFE - acquires mplock
721 svn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags)
729 KASSERT(uio->uio_td == curthread,
730 ("uio_td %p is not p %p", uio->uio_td, curthread));
732 vp = (struct vnode *)fp->f_data;
733 if (vp == NULL || vp->v_type == VBAD) {
737 if (vp->v_type == VREG)
739 vp = (struct vnode *)fp->f_data; /* XXX needed? */
741 if ((dev = vp->v_rdev) == NULL) {
747 if ((flags & O_FOFFSET) == 0)
748 uio->uio_offset = fp->f_offset;
751 if (vp->v_type == VREG &&
752 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) {
756 if (flags & O_FBLOCKING) {
757 /* ioflag &= ~IO_NDELAY; */
758 } else if (flags & O_FNONBLOCKING) {
760 } else if (fp->f_flag & FNONBLOCK) {
763 if (flags & O_FBUFFERED) {
764 /* ioflag &= ~IO_DIRECT; */
765 } else if (flags & O_FUNBUFFERED) {
767 } else if (fp->f_flag & O_DIRECT) {
770 if (flags & O_FASYNCWRITE) {
771 /* ioflag &= ~IO_SYNC; */
772 } else if (flags & O_FSYNCWRITE) {
774 } else if (fp->f_flag & O_FSYNC) {
778 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
780 ioflag |= sequential_heuristic(uio, fp);
782 error = dev_dwrite(dev, uio, ioflag);
785 if ((flags & O_FOFFSET) == 0)
786 fp->f_offset = uio->uio_offset;
787 fp->f_nextoff = uio->uio_offset;
794 * MPALMOSTSAFE - acquires mplock
797 vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred)
803 vp = (struct vnode *)fp->f_data;
804 error = vn_stat(vp, sb, cred);
810 vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred)
819 error = VOP_GETATTR(vp, vap);
824 * Zero the spare stat fields
830 * Copy from vattr table
832 if (vap->va_fsid != VNOVAL)
833 sb->st_dev = vap->va_fsid;
835 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
836 sb->st_ino = vap->va_fileid;
838 switch (vap->va_type) {
853 /* This is a cosmetic change, symlinks do not have a mode. */
854 if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW)
855 sb->st_mode &= ~ACCESSPERMS; /* 0000 */
857 sb->st_mode |= ACCESSPERMS; /* 0777 */
869 sb->st_nlink = vap->va_nlink;
870 sb->st_uid = vap->va_uid;
871 sb->st_gid = vap->va_gid;
872 sb->st_rdev = makeudev(vap->va_rmajor, vap->va_rminor);
873 sb->st_size = vap->va_size;
874 sb->st_atimespec = vap->va_atime;
875 sb->st_mtimespec = vap->va_mtime;
876 sb->st_ctimespec = vap->va_ctime;
879 * A VCHR and VBLK device may track the last access and last modified
880 * time independantly of the filesystem. This is particularly true
881 * because device read and write calls may bypass the filesystem.
883 if (vp->v_type == VCHR || vp->v_type == VBLK) {
884 if ((dev = vp->v_rdev) != NULL) {
885 if (dev->si_lastread) {
886 sb->st_atimespec.tv_sec = dev->si_lastread;
887 sb->st_atimespec.tv_nsec = 0;
889 if (dev->si_lastwrite) {
890 sb->st_atimespec.tv_sec = dev->si_lastwrite;
891 sb->st_atimespec.tv_nsec = 0;
897 * According to www.opengroup.org, the meaning of st_blksize is
898 * "a filesystem-specific preferred I/O block size for this
899 * object. In some filesystem types, this may vary from file
901 * Default to PAGE_SIZE after much discussion.
904 if (vap->va_type == VREG) {
905 sb->st_blksize = vap->va_blocksize;
906 } else if (vn_isdisk(vp, NULL)) {
908 * XXX this is broken. If the device is not yet open (aka
909 * stat() call, aka v_rdev == NULL), how are we supposed
910 * to get a valid block size out of it?
914 if ((dev = vp->v_rdev) == NULL) {
915 if (vp->v_type == VCHR)
916 dev = get_dev(vp->v_umajor, vp->v_uminor);
918 sb->st_blksize = dev->si_bsize_best;
919 if (sb->st_blksize < dev->si_bsize_phys)
920 sb->st_blksize = dev->si_bsize_phys;
921 if (sb->st_blksize < BLKDEV_IOSIZE)
922 sb->st_blksize = BLKDEV_IOSIZE;
924 sb->st_blksize = PAGE_SIZE;
927 sb->st_flags = vap->va_flags;
928 if (suser_cred(cred, 0))
931 sb->st_gen = vap->va_gen;
933 #if (S_BLKSIZE == 512)
934 /* Optimize this case */
935 sb->st_blocks = vap->va_bytes >> 9;
937 sb->st_blocks = vap->va_bytes / S_BLKSIZE;
939 sb->st_fsmid = vap->va_fsmid;
944 * MPALMOSTSAFE - acquires mplock
947 vn_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred)
949 struct vnode *vp = ((struct vnode *)fp->f_data);
956 switch (vp->v_type) {
959 if (com == FIONREAD) {
960 if ((error = VOP_GETATTR(vp, &vattr)) != 0)
962 *(int *)data = vattr.va_size - fp->f_offset;
966 if (com == FIOASYNC) { /* XXX */
978 if (com == FIODTYPE) {
979 if (vp->v_type != VCHR && vp->v_type != VBLK) {
983 *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK;
987 error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred);
988 if (error == 0 && com == TIOCSCTTY) {
989 struct proc *p = curthread->td_proc;
990 struct session *sess;
998 /* Do nothing if reassigning same control tty */
999 if (sess->s_ttyvp == vp) {
1004 /* Get rid of reference to old control tty */
1005 ovp = sess->s_ttyvp;
1018 * MPALMOSTSAFE - acquires mplock
1021 vn_poll(struct file *fp, int events, struct ucred *cred)
1026 error = VOP_POLL(((struct vnode *)fp->f_data), events, cred);
1032 * Check that the vnode is still valid, and if so
1033 * acquire requested lock.
1037 vn_lock(struct vnode *vp, int flags)
1039 debug_vn_lock(struct vnode *vp, int flags, const char *filename, int line)
1046 vp->filename = filename;
1048 error = debuglockmgr(&vp->v_lock, flags,
1049 "vn_lock", filename, line);
1051 error = lockmgr(&vp->v_lock, flags);
1055 } while (flags & LK_RETRY);
1058 * Because we (had better!) have a ref on the vnode, once it
1059 * goes to VRECLAIMED state it will not be recycled until all
1060 * refs go away. So we can just check the flag.
1062 if (error == 0 && (vp->v_flag & VRECLAIMED)) {
1063 lockmgr(&vp->v_lock, LK_RELEASE);
1070 vn_unlock(struct vnode *vp)
1072 lockmgr(&vp->v_lock, LK_RELEASE);
1076 vn_islocked(struct vnode *vp)
1078 return (lockstatus(&vp->v_lock, curthread));
1082 * MPALMOSTSAFE - acquires mplock
1085 vn_closefile(struct file *fp)
1090 fp->f_ops = &badfileops;
1091 error = vn_close(((struct vnode *)fp->f_data), fp->f_flag);
1097 * MPALMOSTSAFE - acquires mplock
1100 vn_kqfilter(struct file *fp, struct knote *kn)
1105 error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn);