2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)vnode.h 8.7 (Berkeley) 2/4/94
34 * $FreeBSD: src/sys/sys/vnode.h,v 1.111.2.19 2002/12/29 18:19:53 dillon Exp $
35 * $DragonFly: src/sys/sys/vnode.h,v 1.24 2004/10/07 01:13:20 dillon Exp $
41 #include <sys/queue.h>
43 #include <sys/select.h>
46 #include <sys/namecache.h>
47 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
48 #include <sys/thread.h>
50 #include <sys/vfsops.h>
51 #include <sys/vfscache.h>
53 #include <machine/lock.h>
56 * The vnode is the focus of all file activity in UNIX. There is a
57 * unique vnode allocated for each active file, each current directory,
58 * each mounted-on file, text file, and the root.
62 * Each underlying filesystem allocates its own private area and hangs
63 * it from v_data. If non-null, this area is freed in getnewvnode().
65 TAILQ_HEAD(buflists, buf);
69 * Reading or writing any of these items requires holding the appropriate lock.
70 * v_freelist is locked by the global vnode_free_list token.
71 * v_mntvnodes is locked by the global mntvnodes token.
72 * v_flag, v_usecount, v_holdcount and v_writecount are
73 * locked by the v_interlock token.
74 * v_pollinfo is locked by the lock contained inside it.
76 * NOTE: XXX v_opencount currently only used by specfs. It should be used
79 * NOTE: The v_vnlock pointer is now an embedded lock structure, v_lock.
80 * v_lock is currently locked exclusively for writes but when a
81 * range lock is added later on it will be locked shared for writes
82 * and a range will be exclusively reserved in the rangelock space.
83 * v_lock is currently locked exclusively for directory modifying
84 * operations but when we start locking namespaces it will no longer
85 * be used for that function, only for the actual I/O on the directory.
88 u_long v_flag; /* vnode flags (see below) */
89 int v_usecount; /* reference count of users */
90 int v_writecount; /* reference count of writers */
91 int v_holdcnt; /* page & buffer references */
92 int v_opencount; /* number of explicit opens */
93 u_long v_id; /* capability identifier */
94 struct mount *v_mount; /* ptr to vfs we are in */
95 struct vop_ops *v_ops; /* mount, vops, other things */
96 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
97 TAILQ_ENTRY(vnode) v_nmntvnodes; /* vnodes for mount point */
98 struct buflists v_cleanblkhd; /* clean blocklist head */
99 struct buflists v_dirtyblkhd; /* dirty blocklist head */
100 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */
101 long v_numoutput; /* num of writes in progress */
102 enum vtype v_type; /* vnode type */
104 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
105 struct socket *vu_socket; /* unix ipc (VSOCK) */
107 udev_t vu_udev; /* device number for attach */
108 struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
109 SLIST_ENTRY(vnode) vu_specnext;
111 struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
113 struct nqlease *v_lease; /* Soft reference to lease */
114 daddr_t v_lastw; /* last write (write cluster) */
115 daddr_t v_cstart; /* start block of cluster */
116 daddr_t v_lasta; /* last allocation */
117 int v_clen; /* length of current cluster */
118 struct vm_object *v_object; /* Place to store VM object */
119 lwkt_token_t v_interlock; /* lock on usecount and flag */
120 struct lock v_lock; /* file/dir ops lock */
121 enum vtagtype v_tag; /* type of underlying data */
122 void *v_data; /* private data for fs */
123 struct namecache_list v_namecache; /* associated nc entries */
125 struct lwkt_token vpi_token; /* lock to protect below */
126 struct selinfo vpi_selinfo; /* identity of poller(s) */
127 short vpi_events; /* what they are looking for */
128 short vpi_revents; /* what has happened */
130 struct thread *v_vxthread; /* thread owning VXLOCK */
131 struct vmresident *v_resident; /* optional vmresident */
133 const char *filename; /* Source file doing locking */
134 int line; /* Line number doing locking */
137 #define v_mountedhere v_un.vu_mountedhere
138 #define v_socket v_un.vu_socket
139 #define v_udev v_un.vu_spec.vu_udev
140 #define v_rdev v_un.vu_spec.vu_specinfo
141 #define v_specnext v_un.vu_spec.vu_specnext
142 #define v_fifoinfo v_un.vu_fifoinfo
144 #define VN_POLLEVENT(vp, events) \
146 if ((vp)->v_pollinfo.vpi_events & (events)) \
147 vn_pollevent((vp), (events)); \
153 #define VROOT 0x00001 /* root of its file system */
154 #define VTEXT 0x00002 /* vnode is a pure text prototype */
155 #define VSYSTEM 0x00004 /* vnode being used by kernel */
156 #define VISTTY 0x00008 /* vnode represents a tty */
157 #define VXLOCK 0x00100 /* vnode is locked to change underlying type */
158 #define VXWANT 0x00200 /* process is waiting for vnode */
159 #define VBWAIT 0x00400 /* waiting for output to complete */
160 /* open for business 0x00800 */
161 /* open for business 0x01000 */
162 #define VOBJBUF 0x02000 /* Allocate buffers in VM object */
163 /* open for business 0x04000 */
164 #define VAGE 0x08000 /* Insert vnode at head of free list */
165 #define VOLOCK 0x10000 /* vnode is locked waiting for an object */
166 #define VOWANT 0x20000 /* a process is waiting for VOLOCK */
167 #define VDOOMED 0x40000 /* This vnode is being recycled */
168 #define VFREE 0x80000 /* This vnode is on the freelist */
169 #define VINFREE 0x100000 /* This vnode is in the midst of being freed */
170 #define VONWORKLST 0x200000 /* On syncer work-list */
171 #define VMOUNT 0x400000 /* Mount in progress */
172 #define VOBJDIRTY 0x800000 /* object might be dirty */
173 #define VPLACEMARKER 0x1000000 /* dummy vnode placemarker */
176 * Flags for ioflag. (high 16 bits used to ask for read-ahead and
177 * help with write clustering)
179 #define IO_UNIT 0x0001 /* do I/O as atomic unit */
180 #define IO_APPEND 0x0002 /* append write to end */
181 #define IO_SYNC 0x0004 /* do I/O synchronously */
182 #define IO_NODELOCKED 0x0008 /* underlying node already locked */
183 #define IO_NDELAY 0x0010 /* FNDELAY flag set in file table */
184 #define IO_VMIO 0x0020 /* data already in VMIO space */
185 #define IO_INVAL 0x0040 /* invalidate after I/O */
186 #define IO_ASYNC 0x0080 /* bawrite rather then bdwrite */
187 #define IO_DIRECT 0x0100 /* attempt to bypass buffer cache */
188 #define IO_NOWDRAIN 0x0200 /* do not block on wdrain */
189 #define IO_CORE 0x0400 /* I/O is part of core dump */
191 #define IO_SEQMAX 0x7F /* seq heuristic max value */
192 #define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */
195 * Modes. Note that these V-modes must match file S_I*USR, SUID, SGID,
196 * and SVTX flag bits.
198 * VCREATE, VDELETE, and VEXCL may only be used in naccess() calls.
200 #define VDELETE 040000 /* delete if the file/dir exists */
201 #define VCREATE 020000 /* create if the file/dir does not exist */
202 #define VEXCL 010000 /* error if the file/dir already exists */
204 #define VSUID 04000 /* set user id on execution */
205 #define VSGID 02000 /* set group id on execution */
206 #define VSVTX 01000 /* save swapped text even after use */
207 #define VREAD 00400 /* read, write, execute permissions */
212 * Token indicating no attribute value yet assigned.
217 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
219 #define VLKTIMEOUT (hz / 20 + 1)
223 #ifdef MALLOC_DECLARE
224 MALLOC_DECLARE(M_VNODE);
228 * Convert between vnode types and inode formats (since POSIX.1
229 * defines mode word of stat structure in terms of inode formats).
231 extern enum vtype iftovt_tab[];
232 extern int vttoif_tab[];
233 #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
234 #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
235 #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
238 * Flags to various vnode functions.
240 #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
241 #define FORCECLOSE 0x0002 /* vflush: force file closure */
242 #define WRITECLOSE 0x0004 /* vflush: only close writable files */
243 #define DOCLOSE 0x0008 /* vclean: close active files */
244 #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
245 #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
248 #define VATTR_NULL(vap) vattr_null(vap)
250 #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
251 #endif /* DIAGNOSTIC */
253 #define NULLVP ((struct vnode *)NULL)
255 #define VNODEOP_SET(f) \
256 C_SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops_sysinit, &f); \
257 C_SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND,vfs_rm_vnodeops_sysinit, &f);
262 extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
263 extern struct namecache *rootncp; /* root (i.e. "/") namecache */
264 extern int desiredvnodes; /* number of vnodes desired */
265 extern time_t syncdelay; /* max time to delay syncing data */
266 extern time_t filedelay; /* time to delay syncing files */
267 extern time_t dirdelay; /* time to delay syncing directories */
268 extern time_t metadelay; /* time to delay syncing metadata */
269 extern struct vm_zone *namei_zone;
270 extern int prtactive; /* nonzero to call vprint() */
271 extern struct vattr va_null; /* predefined null vattr structure */
272 extern int vfs_ioopt;
275 * Macro/function to check for client cache inconsistency w.r.t. leasing.
277 #define LEASE_READ 0x1 /* Check lease for readers */
278 #define LEASE_WRITE 0x2 /* Check lease for modifiers */
281 extern void (*lease_updatetime) (int deltat);
283 #define VI_LOCK(vlock, vp) lwkt_gettoken(vlock, (vp)->v_interlock)
284 #define VI_UNLOCK(vlock, vp) lwkt_reltoken(vlock)
289 * Mods for extensibility.
293 * Flags for vdesc_flags:
295 #define VDESC_MAX_VPS 8
296 /* Low order 8 flag bits are reserved for willrele flags for vp arguments. */
297 #define VDESC_VP0_WILLRELE 0x00000001
298 #define VDESC_VP1_WILLRELE 0x00000002
299 #define VDESC_VP2_WILLRELE 0x00000004
300 #define VDESC_VP3_WILLRELE 0x00000008
301 #define VDESC_VP4_WILLRELE 0x00000010
302 #define VDESC_VP5_WILLRELE 0x00000020
303 #define VDESC_VP6_WILLRELE 0x00000040
304 #define VDESC_VP7_WILLRELE 0x00000080
305 #define VDESC_NOMAP_VPP 0x00000100
306 #define VDESC_VPP_WILLRELE 0x00000200
307 #define VDESC_VP0_WILLUNLOCK 0x00010000
308 #define VDESC_VP1_WILLUNLOCK 0x00020000
309 #define VDESC_VP2_WILLUNLOCK 0x00040000
310 #define VDESC_VP3_WILLUNLOCK 0x00080000
311 #define VDESC_VP4_WILLUNLOCK 0x00100000
312 #define VDESC_VP5_WILLUNLOCK 0x00200000
313 #define VDESC_VP6_WILLUNLOCK 0x00400000
314 #define VDESC_VP7_WILLUNLOCK 0x00800000
317 * VDESC_NO_OFFSET is used to identify the end of the offset list
318 * and in places where no such field exists.
320 #define VDESC_NO_OFFSET -1
323 * This structure describes the vnode operation taking place.
325 struct vnodeop_desc {
326 int vdesc_offset; /* offset in vector--first for speed */
327 char *vdesc_name; /* a readable name for debugging */
328 int vdesc_flags; /* VDESC_* flags */
331 * These ops are used by bypass routines to map and locate arguments.
332 * Creds and procs are not needed in bypass routines, but sometimes
333 * they are useful to (for example) transport layers.
334 * Nameidata is useful because it has a cred in it.
336 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
337 int vdesc_vpp_offset; /* return vpp location */
338 int vdesc_cred_offset; /* cred location, if any */
339 int vdesc_proc_offset; /* proc location, if any */
340 int vdesc_componentname_offset; /* if any */
345 * A list of all the operation descs.
347 extern struct vnodeop_desc *vnodeop_descs[];
350 * Interlock for scanning list of vnodes attached to a mountpoint
352 extern struct lwkt_token mntvnode_token;
355 * This macro is very helpful in defining those offsets in the vdesc struct.
357 * This is stolen from X11R4. I ignored all the fancy stuff for
358 * Crays, so if you decide to port this to such a serious machine,
359 * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
361 #define VOPARG_OFFSET(p_type,field) \
362 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
363 #define VOPARG_OFFSETOF(s_type,field) \
364 VOPARG_OFFSET(s_type*,field)
365 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
366 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
370 * This structure is used to configure the new vnodeops vector. The entry
371 * descriptor describes a patricular VOP function while the operations
372 * vector descriptor recursively describes arrays of entry descriptors.
374 struct vnodeopv_entry_desc {
375 struct vnodeop_desc *opve_op;
376 int (*opve_func)(struct vop_generic_args *ap);
379 struct vnodeopv_desc {
380 struct vop_ops **opv_desc_vector; /* vect to allocate/fill*/
381 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
384 struct vnodeopv_node {
385 TAILQ_ENTRY(vnodeopv_node) entry;
386 struct vop_ops *ops; /* allocated vector */
387 struct vnodeopv_entry_desc *descs; /* null terminated list */
390 #ifdef DEBUG_VFS_LOCKS
392 * Macros to aid in tracing VFS locking problems. Not totally
393 * reliable since if the process sleeps between changing the lock
394 * state and checking it with the assert, some other process could
395 * change the state. They are good enough for debugging a single
396 * filesystem using a single-threaded test. I find that 'cvs co src'
397 * is a pretty good test.
401 * [dfr] Kludge until I get around to fixing all the vfs locking.
403 #define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \
404 || (vp)->v_tag == VT_MFS \
405 || (vp)->v_tag == VT_NFS \
406 || (vp)->v_tag == VT_LFS \
407 || (vp)->v_tag == VT_ISOFS \
408 || (vp)->v_tag == VT_MSDOSFS)
410 #define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked(vp, str)
411 #define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked(vp, str);
413 #define ASSERT_VOP_ELOCKED(vp, str) \
415 struct vnode *_vp = (vp); \
417 if (_vp && IS_LOCKING_VFS(_vp) && \
418 VOP_ISLOCKED(_vp, curthread) != LK_EXCLUSIVE) \
419 panic("%s: %p is not exclusive locked but should be", \
423 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) \
425 struct vnode *_vp = (vp); \
427 if (_vp && IS_LOCKING_VFS(_vp) && \
428 VOP_ISLOCKED(_vp, curthread) != LK_EXCLOTHER) \
429 panic("%s: %p is not exclusive locked by another proc", \
433 #define ASSERT_VOP_SLOCKED(vp, str) \
435 struct vnode *_vp = (vp); \
437 if (_vp && IS_LOCKING_VFS(_vp) && \
438 VOP_ISLOCKED(_vp, NULL) != LK_SHARED) \
439 panic("%s: %p is not locked shared but should be", \
443 void assert_vop_locked(struct vnode *vp, const char *str);
444 void assert_vop_unlocked(struct vnode *vp, const char *str);
448 #define ASSERT_VOP_LOCKED(vp, str)
449 #define ASSERT_VOP_UNLOCKED(vp, str)
451 #endif /* DEBUG_VFS_LOCKS */
454 * VOCALL calls an op given an ops vector. We break it out because BSD's
455 * vclean changes the ops vector and then wants to call ops with the old
459 typedef int (*vocall_func_t)(struct vop_generic_args *);
462 * This call executes the vops vector for the offset stored in the ap's
463 * descriptor of the passed vops rather then the one related to the
464 * ap's vop_ops structure. It is used to chain VOPS calls on behalf of
465 * filesystems from a VFS's context ONLY (that is, from a VFS's own vops
468 #define VOCALL(vops, ap) \
469 (*(vocall_func_t *)((char *)(vops)+((ap)->a_desc->vdesc_offset)))(ap)
471 #define VDESC(OP) (& __CONCAT(OP,_desc))
472 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
475 * VMIO support inline
478 extern int vmiodirenable;
481 vn_canvmio(struct vnode *vp)
483 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
489 * Public vnode manipulation functions.
503 struct vop_bwrite_args;
505 extern int (*lease_check_hook) (struct vop_lease_args *);
507 void addaliasu (struct vnode *vp, udev_t nvp_udev);
508 int v_associate_rdev(struct vnode *vp, dev_t dev);
509 void v_release_rdev(struct vnode *vp);
510 int bdevvp (dev_t dev, struct vnode **vpp);
511 void cvtstat (struct stat *st, struct ostat *ost);
512 void cvtnstat (struct stat *sb, struct nstat *nsb);
513 int getnewvnode (enum vtagtype tag, struct mount *mp, struct vop_ops *ops,
514 struct vnode **vpp, int timo, int lkflags);
515 int lease_check (struct vop_lease_args *ap);
516 int spec_vnoperate (struct vop_generic_args *);
517 int speedup_syncer (void);
518 void vattr_null (struct vattr *vap);
519 int vcount (struct vnode *vp);
520 void vdrop (struct vnode *);
521 int vfinddev (dev_t dev, enum vtype type, struct vnode **vpp);
522 void vfs_add_vnodeops_sysinit (const void *);
523 void vfs_rm_vnodeops_sysinit (const void *);
524 void vfs_add_vnodeops(struct vop_ops **, struct vnodeopv_entry_desc *);
525 void vfs_rm_vnodeops(struct vop_ops **);
526 int vflush (struct mount *mp, int rootrefs, int flags);
527 int vmntvnodescan(struct mount *mp,
528 int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
529 int (*slowfunc)(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock,
530 void *data), void *data);
532 int vget (struct vnode *vp, lwkt_tokref_t vlock, int lockflag, struct thread *td);
533 void vgone (struct vnode *vp);
534 void vgonel (struct vnode *vp, lwkt_tokref_t vlock, struct thread *td);
535 void vhold (struct vnode *);
536 int vinvalbuf (struct vnode *vp, int save,
537 struct thread *td, int slpflag, int slptimeo);
538 int vtruncbuf (struct vnode *vp, struct thread *td,
539 off_t length, int blksize);
540 void vprint (char *label, struct vnode *vp);
541 int vrecycle (struct vnode *vp, struct lwkt_tokref *inter_lkp,
543 int vn_close (struct vnode *vp, int flags, struct thread *td);
544 int vn_isdisk (struct vnode *vp, int *errp);
545 int vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td);
547 int debug_vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td,
548 const char *filename, int line);
549 #define vn_lock(vp,vlock,flags,p) debug_vn_lock(vp,vlock,flags,p,__FILE__,__LINE__)
552 int vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf);
553 int vn_open (struct nameidata *ndp, int fmode, int cmode);
554 void vn_pollevent (struct vnode *vp, int events);
555 void vn_pollgone (struct vnode *vp);
556 int vn_pollrecord (struct vnode *vp, struct thread *td, int events);
557 int vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
558 int len, off_t offset, enum uio_seg segflg, int ioflg,
559 struct ucred *cred, int *aresid, struct thread *td);
560 int vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
561 int len, off_t offset, enum uio_seg segflg, int ioflg,
562 struct ucred *cred, int *aresid, struct thread *td);
563 int vn_stat (struct vnode *vp, struct stat *sb, struct thread *td);
564 dev_t vn_todev (struct vnode *vp);
565 int vfs_object_create (struct vnode *vp, struct thread *td);
566 void vfs_timestamp (struct timespec *);
567 int vn_writechk (struct vnode *vp);
568 int vop_stdbwrite (struct vop_bwrite_args *ap);
569 int vop_stdislocked (struct vop_islocked_args *ap);
570 int vop_stdlock (struct vop_lock_args *ap);
571 int vop_stdrlock (struct vop_lock_args *ap);
572 int vop_stdunlock (struct vop_unlock_args *ap);
573 int vop_noresolve(struct vop_resolve_args *ap);
574 int vop_nopoll (struct vop_poll_args *ap);
575 int vop_stdpathconf (struct vop_pathconf_args *ap);
576 int vop_stdpoll (struct vop_poll_args *ap);
577 int vop_stdrevoke (struct vop_revoke_args *ap);
578 int vop_eopnotsupp (struct vop_generic_args *ap);
579 int vop_ebadf (struct vop_generic_args *ap);
580 int vop_einval (struct vop_generic_args *ap);
581 int vop_enotty (struct vop_generic_args *ap);
582 int vop_defaultop (struct vop_generic_args *ap);
583 int vop_null (struct vop_generic_args *ap);
584 int vop_panic (struct vop_generic_args *ap);
585 int vop_stdcreatevobject (struct vop_createvobject_args *ap);
586 int vop_stddestroyvobject (struct vop_destroyvobject_args *ap);
587 int vop_stdgetvobject (struct vop_getvobject_args *ap);
590 void vput (struct vnode *vp);
591 void vrele (struct vnode *vp);
592 void vrele_noinactive (struct vnode *vp);
593 void vref (struct vnode *vp);
595 extern struct vop_ops *default_vnode_vops;
596 extern struct vop_ops *spec_vnode_vops;
597 extern struct vop_ops *dead_vnode_vops;
601 #endif /* !_SYS_VNODE_H_ */