vnode.h revision 34611
1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 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 31 * SUCH DAMAGE. 32 * 33 * @(#)vnode.h 8.7 (Berkeley) 2/4/94 34 * $Id: vnode.h,v 1.68 1998/03/08 09:58:35 julian Exp $ 35 */ 36 37#ifndef _SYS_VNODE_H_ 38#define _SYS_VNODE_H_ 39 40#include <sys/queue.h> 41#include <sys/select.h> /* needed for struct selinfo in vnodes */ 42 43#include <machine/lock.h> 44 45/* 46 * The vnode is the focus of all file activity in UNIX. There is a 47 * unique vnode allocated for each active file, each current directory, 48 * each mounted-on file, text file, and the root. 49 */ 50 51/* 52 * Vnode types. VNON means no type. 53 */ 54enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD }; 55 56/* 57 * Vnode tag types. 58 * These are for the benefit of external programs only (e.g., pstat) 59 * and should NEVER be inspected by the kernel. 60 */ 61enum vtagtype { 62 VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_PC, VT_LFS, VT_LOFS, VT_FDESC, 63 VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS, 64 VT_UNION, VT_MSDOSFS, VT_DEVFS, VT_TFS, VT_VFS 65}; 66 67/* 68 * Each underlying filesystem allocates its own private area and hangs 69 * it from v_data. If non-null, this area is freed in getnewvnode(). 70 */ 71LIST_HEAD(buflists, buf); 72 73typedef int vop_t __P((void *)); 74struct namecache; 75 76/* 77 * Reading or writing any of these items requires holding the appropriate lock. 78 * v_freelist is locked by the global vnode_free_list simple lock. 79 * v_mntvnodes is locked by the global mntvnodes simple lock. 80 * v_flag, v_usecount, v_holdcount and v_writecount are 81 * locked by the v_interlock simple lock. 82 * v_pollinfo is locked by the lock contained inside it. 83 */ 84struct vnode { 85 u_long v_flag; /* vnode flags (see below) */ 86 int v_usecount; /* reference count of users */ 87 int v_writecount; /* reference count of writers */ 88 int v_holdcnt; /* page & buffer references */ 89 daddr_t v_lastr; /* last read (read-ahead) */ 90 u_long v_id; /* capability identifier */ 91 struct mount *v_mount; /* ptr to vfs we are in */ 92 vop_t **v_op; /* vnode operations vector */ 93 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */ 94 LIST_ENTRY(vnode) v_mntvnodes; /* vnodes for mount point */ 95 struct buflists v_cleanblkhd; /* clean blocklist head */ 96 struct buflists v_dirtyblkhd; /* dirty blocklist head */ 97 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */ 98 long v_numoutput; /* num of writes in progress */ 99 enum vtype v_type; /* vnode type */ 100 union { 101 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */ 102 struct socket *vu_socket; /* unix ipc (VSOCK) */ 103 struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */ 104 struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */ 105 } v_un; 106 struct nqlease *v_lease; /* Soft reference to lease */ 107 daddr_t v_lastw; /* last write (write cluster) */ 108 daddr_t v_cstart; /* start block of cluster */ 109 daddr_t v_lasta; /* last allocation */ 110 int v_clen; /* length of current cluster */ 111 int v_maxio; /* maximum I/O cluster size */ 112 struct vm_object *v_object; /* Place to store VM object */ 113 struct simplelock v_interlock; /* lock on usecount and flag */ 114 struct lock *v_vnlock; /* used for non-locking fs's */ 115 enum vtagtype v_tag; /* type of underlying data */ 116 void *v_data; /* private data for fs */ 117 LIST_HEAD(, namecache) v_cache_src; /* Cache entries from us */ 118 TAILQ_HEAD(, namecache) v_cache_dst; /* Cache entries to us */ 119 struct vnode *v_dd; /* .. vnode */ 120 u_long v_ddid; /* .. capability identifier */ 121 struct { 122 struct simplelock vpi_lock; /* lock to protect below */ 123 struct selinfo vpi_selinfo; /* identity of poller(s) */ 124 short vpi_events; /* what they are looking for */ 125 short vpi_revents; /* what has happened */ 126 } v_pollinfo; 127}; 128#define v_mountedhere v_un.vu_mountedhere 129#define v_socket v_un.vu_socket 130#define v_specinfo v_un.vu_specinfo 131#define v_fifoinfo v_un.vu_fifoinfo 132 133#define VN_POLLEVENT(vp, events) \ 134 do { \ 135 if ((vp)->v_pollinfo.vpi_events & (events)) \ 136 vn_pollevent((vp), (events)); \ 137 } while (0) 138 139/* 140 * Vnode flags. 141 */ 142#define VROOT 0x00001 /* root of its file system */ 143#define VTEXT 0x00002 /* vnode is a pure text prototype */ 144#define VSYSTEM 0x00004 /* vnode being used by kernel */ 145#define VISTTY 0x00008 /* vnode represents a tty */ 146#define VXLOCK 0x00100 /* vnode is locked to change underlying type */ 147#define VXWANT 0x00200 /* process is waiting for vnode */ 148#define VBWAIT 0x00400 /* waiting for output to complete */ 149#define VALIASED 0x00800 /* vnode has an alias */ 150#define VDIROP 0x01000 /* LFS: vnode is involved in a directory op */ 151#define VOBJBUF 0x02000 /* Allocate buffers in VM object */ 152#define VNINACT 0x04000 /* LFS: skip ufs_inactive() in lfs_vunref */ 153#define VAGE 0x08000 /* Insert vnode at head of free list */ 154#define VOLOCK 0x10000 /* vnode is locked waiting for an object */ 155#define VOWANT 0x20000 /* a process is waiting for VOLOCK */ 156#define VDOOMED 0x40000 /* This vnode is being recycled */ 157#define VFREE 0x80000 /* This vnode is on the freelist */ 158#define VTBFREE 0x100000 /* This vnode is on the to-be-freelist */ 159#define VONWORKLST 0x200000 /* On syncer work-list */ 160 161/* 162 * Vnode attributes. A field value of VNOVAL represents a field whose value 163 * is unavailable (getattr) or which is not to be changed (setattr). 164 */ 165struct vattr { 166 enum vtype va_type; /* vnode type (for create) */ 167 u_short va_mode; /* files access mode and type */ 168 short va_nlink; /* number of references to file */ 169 uid_t va_uid; /* owner user id */ 170 gid_t va_gid; /* owner group id */ 171 long va_fsid; /* file system id (dev for now) */ 172 long va_fileid; /* file id */ 173 u_quad_t va_size; /* file size in bytes */ 174 long va_blocksize; /* blocksize preferred for i/o */ 175 struct timespec va_atime; /* time of last access */ 176 struct timespec va_mtime; /* time of last modification */ 177 struct timespec va_ctime; /* time file changed */ 178 u_long va_gen; /* generation number of file */ 179 u_long va_flags; /* flags defined for file */ 180 dev_t va_rdev; /* device the special file represents */ 181 u_quad_t va_bytes; /* bytes of disk space held by file */ 182 u_quad_t va_filerev; /* file modification number */ 183 u_int va_vaflags; /* operations flags, see below */ 184 long va_spare; /* remain quad aligned */ 185}; 186 187/* 188 * Flags for va_vaflags. 189 */ 190#define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */ 191#define VA_EXCLUSIVE 0x02 /* exclusive create request */ 192 193/* 194 * Flags for ioflag. 195 */ 196#define IO_UNIT 0x01 /* do I/O as atomic unit */ 197#define IO_APPEND 0x02 /* append write to end */ 198#define IO_SYNC 0x04 /* do I/O synchronously */ 199#define IO_NODELOCKED 0x08 /* underlying node already locked */ 200#define IO_NDELAY 0x10 /* FNDELAY flag set in file table */ 201#define IO_VMIO 0x20 /* data already in VMIO space */ 202#define IO_INVAL 0x40 /* invalidate after I/O */ 203 204/* 205 * Modes. Some values same as Ixxx entries from inode.h for now. 206 */ 207#define VSUID 04000 /* set user id on execution */ 208#define VSGID 02000 /* set group id on execution */ 209#define VSVTX 01000 /* save swapped text even after use */ 210#define VREAD 00400 /* read, write, execute permissions */ 211#define VWRITE 00200 212#define VEXEC 00100 213 214/* 215 * Token indicating no attribute value yet assigned. 216 */ 217#define VNOVAL (-1) 218 219#ifdef KERNEL 220 221#ifdef MALLOC_DECLARE 222MALLOC_DECLARE(M_VNODE); 223#endif 224 225/* 226 * Convert between vnode types and inode formats (since POSIX.1 227 * defines mode word of stat structure in terms of inode formats). 228 */ 229extern enum vtype iftovt_tab[]; 230extern int vttoif_tab[]; 231#define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12]) 232#define VTTOIF(indx) (vttoif_tab[(int)(indx)]) 233#define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode)) 234 235/* 236 * Flags to various vnode functions. 237 */ 238#define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */ 239#define FORCECLOSE 0x0002 /* vflush: force file closure */ 240#define WRITECLOSE 0x0004 /* vflush: only close writable files */ 241#define DOCLOSE 0x0008 /* vclean: close active files */ 242#define V_SAVE 0x0001 /* vinvalbuf: sync file first */ 243#define V_SAVEMETA 0x0002 /* vinvalbuf: leave indirect blocks */ 244#define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */ 245 246#define VREF(vp) vref(vp) 247 248 249#ifdef DIAGNOSTIC 250#define VATTR_NULL(vap) vattr_null(vap) 251#else 252#define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */ 253#endif /* DIAGNOSTIC */ 254 255#define NULLVP ((struct vnode *)NULL) 256 257#ifdef VFS_LKM 258#define VNODEOP_SET(f) DATA_SET(MODVNOPS,f) 259#else 260#define VNODEOP_SET(f) DATA_SET(vfs_opv_descs_,f) 261#endif 262 263/* 264 * Global vnode data. 265 */ 266extern struct vnode *rootvnode; /* root (i.e. "/") vnode */ 267extern int desiredvnodes; /* number of vnodes desired */ 268extern time_t syncdelay; /* time to delay syncing vnodes */ 269extern int rushjob; /* # of slots filesys_syncer should run ASAP */ 270extern struct vm_zone *namei_zone; 271extern int prtactive; /* nonzero to call vprint() */ 272extern struct vattr va_null; /* predefined null vattr structure */ 273extern int vfs_ioopt; 274 275/* 276 * Macro/function to check for client cache inconsistency w.r.t. leasing. 277 */ 278#define LEASE_READ 0x1 /* Check lease for readers */ 279#define LEASE_WRITE 0x2 /* Check lease for modifiers */ 280 281 282extern void (*lease_updatetime) __P((int deltat)); 283 284#define VSHOULDFREE(vp) \ 285 (!((vp)->v_flag & (VFREE|VDOOMED)) && \ 286 !(vp)->v_holdcnt && !(vp)->v_usecount && \ 287 (!(vp)->v_object || \ 288 !((vp)->v_object->ref_count || (vp)->v_object->resident_page_count))) 289 290#define VSHOULDBUSY(vp) \ 291 (((vp)->v_flag & (VFREE|VTBFREE)) && \ 292 ((vp)->v_holdcnt || (vp)->v_usecount)) 293 294#endif /* KERNEL */ 295 296 297/* 298 * Mods for extensibility. 299 */ 300 301/* 302 * Flags for vdesc_flags: 303 */ 304#define VDESC_MAX_VPS 16 305/* Low order 16 flag bits are reserved for willrele flags for vp arguments. */ 306#define VDESC_VP0_WILLRELE 0x0001 307#define VDESC_VP1_WILLRELE 0x0002 308#define VDESC_VP2_WILLRELE 0x0004 309#define VDESC_VP3_WILLRELE 0x0008 310#define VDESC_NOMAP_VPP 0x0100 311#define VDESC_VPP_WILLRELE 0x0200 312 313/* 314 * VDESC_NO_OFFSET is used to identify the end of the offset list 315 * and in places where no such field exists. 316 */ 317#define VDESC_NO_OFFSET -1 318 319/* 320 * This structure describes the vnode operation taking place. 321 */ 322struct vnodeop_desc { 323 int vdesc_offset; /* offset in vector--first for speed */ 324 char *vdesc_name; /* a readable name for debugging */ 325 int vdesc_flags; /* VDESC_* flags */ 326 327 /* 328 * These ops are used by bypass routines to map and locate arguments. 329 * Creds and procs are not needed in bypass routines, but sometimes 330 * they are useful to (for example) transport layers. 331 * Nameidata is useful because it has a cred in it. 332 */ 333 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */ 334 int vdesc_vpp_offset; /* return vpp location */ 335 int vdesc_cred_offset; /* cred location, if any */ 336 int vdesc_proc_offset; /* proc location, if any */ 337 int vdesc_componentname_offset; /* if any */ 338 /* 339 * Finally, we've got a list of private data (about each operation) 340 * for each transport layer. (Support to manage this list is not 341 * yet part of BSD.) 342 */ 343 caddr_t *vdesc_transports; 344}; 345 346#ifdef KERNEL 347/* 348 * A list of all the operation descs. 349 */ 350extern struct vnodeop_desc *vnodeop_descs[]; 351 352/* 353 * Interlock for scanning list of vnodes attached to a mountpoint 354 */ 355extern struct simplelock mntvnode_slock; 356 357/* 358 * This macro is very helpful in defining those offsets in the vdesc struct. 359 * 360 * This is stolen from X11R4. I ignored all the fancy stuff for 361 * Crays, so if you decide to port this to such a serious machine, 362 * you might want to consult Intrinsic.h's XtOffset{,Of,To}. 363 */ 364#define VOPARG_OFFSET(p_type,field) \ 365 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL))) 366#define VOPARG_OFFSETOF(s_type,field) \ 367 VOPARG_OFFSET(s_type*,field) 368#define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \ 369 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET))) 370 371 372/* 373 * This structure is used to configure the new vnodeops vector. 374 */ 375struct vnodeopv_entry_desc { 376 struct vnodeop_desc *opve_op; /* which operation this is */ 377 vop_t *opve_impl; /* code implementing this operation */ 378}; 379struct vnodeopv_desc { 380 /* ptr to the ptr to the vector where op should go */ 381 vop_t ***opv_desc_vector_p; 382 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */ 383}; 384 385/* 386 * A generic structure. 387 * This can be used by bypass routines to identify generic arguments. 388 */ 389struct vop_generic_args { 390 struct vnodeop_desc *a_desc; 391 /* other random data follows, presumably */ 392}; 393 394 395#ifdef DEBUG_VFS_LOCKS 396/* 397 * Macros to aid in tracing VFS locking problems. Not totally 398 * reliable since if the process sleeps between changing the lock 399 * state and checking it with the assert, some other process could 400 * change the state. They are good enough for debugging a single 401 * filesystem using a single-threaded test. I find that 'cvs co src' 402 * is a pretty good test. 403 */ 404 405/* 406 * [dfr] Kludge until I get around to fixing all the vfs locking. 407 */ 408#define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \ 409 || (vp)->v_tag == VT_MFS \ 410 || (vp)->v_tag == VT_NFS \ 411 || (vp)->v_tag == VT_LFS \ 412 || (vp)->v_tag == VT_ISOFS \ 413 || (vp)->v_tag == VT_MSDOSFS \ 414 || (vp)->v_tag == VT_DEVFS) 415 416#define ASSERT_VOP_LOCKED(vp, str) \ 417 if ((vp) && IS_LOCKING_VFS(vp) && !VOP_ISLOCKED(vp)) { \ 418 panic("%s: %x is not locked but should be", str, vp); \ 419 } 420 421#define ASSERT_VOP_UNLOCKED(vp, str) \ 422 if ((vp) && IS_LOCKING_VFS(vp) && VOP_ISLOCKED(vp)) { \ 423 panic("%s: %x is locked but shouldn't be", str, vp); \ 424 } 425 426#else 427 428#define ASSERT_VOP_LOCKED(vp, str) 429#define ASSERT_VOP_UNLOCKED(vp, str) 430 431#endif 432 433/* 434 * VOCALL calls an op given an ops vector. We break it out because BSD's 435 * vclean changes the ops vector and then wants to call ops with the old 436 * vector. 437 */ 438#define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP)) 439 440/* 441 * This call works for vnodes in the kernel. 442 */ 443#define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP)) 444#define VDESC(OP) (& __CONCAT(OP,_desc)) 445#define VOFFSET(OP) (VDESC(OP)->vdesc_offset) 446 447/* 448 * Finally, include the default set of vnode operations. 449 */ 450#include "vnode_if.h" 451 452/* 453 * Public vnode manipulation functions. 454 */ 455struct componentname; 456struct file; 457struct mount; 458struct nameidata; 459struct ostat; 460struct proc; 461struct stat; 462struct ucred; 463struct uio; 464struct vattr; 465struct vnode; 466struct vop_bwrite_args; 467 468extern int (*lease_check_hook) __P((struct vop_lease_args *)); 469 470int bdevvp __P((dev_t dev, struct vnode **vpp)); 471/* cache_* may belong in namei.h. */ 472void cache_enter __P((struct vnode *dvp, struct vnode *vp, 473 struct componentname *cnp)); 474int cache_lookup __P((struct vnode *dvp, struct vnode **vpp, 475 struct componentname *cnp)); 476void cache_purge __P((struct vnode *vp)); 477void cache_purgevfs __P((struct mount *mp)); 478void cvtstat __P((struct stat *st, struct ostat *ost)); 479int getnewvnode __P((enum vtagtype tag, 480 struct mount *mp, vop_t **vops, struct vnode **vpp)); 481int lease_check __P((struct vop_lease_args *ap)); 482void vattr_null __P((struct vattr *vap)); 483int vcount __P((struct vnode *vp)); 484void vdrop __P((struct vnode *)); 485int vfinddev __P((dev_t dev, enum vtype type, struct vnode **vpp)); 486void vfs_opv_init __P((struct vnodeopv_desc **them)); 487int vflush __P((struct mount *mp, struct vnode *skipvp, int flags)); 488int vget __P((struct vnode *vp, int lockflag, struct proc *p)); 489void vgone __P((struct vnode *vp)); 490void vhold __P((struct vnode *)); 491int vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred, 492 493 struct proc *p, int slpflag, int slptimeo)); 494int vtruncbuf __P((struct vnode *vp, struct ucred *cred, struct proc *p, 495 off_t length, int blksize)); 496void vprint __P((char *label, struct vnode *vp)); 497int vrecycle __P((struct vnode *vp, struct simplelock *inter_lkp, 498 struct proc *p)); 499int vn_close __P((struct vnode *vp, 500 int flags, struct ucred *cred, struct proc *p)); 501int vn_lock __P((struct vnode *vp, int flags, struct proc *p)); 502int vn_open __P((struct nameidata *ndp, int fmode, int cmode)); 503void vn_pollevent __P((struct vnode *vp, int events)); 504void vn_pollgone __P((struct vnode *vp)); 505int vn_pollrecord __P((struct vnode *vp, struct proc *p, int events)); 506int vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base, 507 int len, off_t offset, enum uio_seg segflg, int ioflg, 508 struct ucred *cred, int *aresid, struct proc *p)); 509int vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p)); 510void vn_syncer_add_to_worklist __P((struct vnode *vp, int delay)); 511int vfs_cache_lookup __P((struct vop_lookup_args *ap)); 512int vfs_object_create __P((struct vnode *vp, struct proc *p, 513 struct ucred *cred, int waslocked)); 514int vn_writechk __P((struct vnode *vp)); 515int vop_stdbwrite __P((struct vop_bwrite_args *ap)); 516int vop_stdislocked __P((struct vop_islocked_args *)); 517int vop_stdlock __P((struct vop_lock_args *)); 518int vop_stdunlock __P((struct vop_unlock_args *)); 519int vop_noislocked __P((struct vop_islocked_args *)); 520int vop_nolock __P((struct vop_lock_args *)); 521int vop_nopoll __P((struct vop_poll_args *)); 522int vop_nounlock __P((struct vop_unlock_args *)); 523int vop_stdpathconf __P((struct vop_pathconf_args *)); 524int vop_stdpoll __P((struct vop_poll_args *)); 525int vop_revoke __P((struct vop_revoke_args *)); 526int vop_sharedlock __P((struct vop_lock_args *)); 527int vop_eopnotsupp __P((struct vop_generic_args *ap)); 528int vop_ebadf __P((struct vop_generic_args *ap)); 529int vop_einval __P((struct vop_generic_args *ap)); 530int vop_enotty __P((struct vop_generic_args *ap)); 531int vop_defaultop __P((struct vop_generic_args *ap)); 532int vop_null __P((struct vop_generic_args *ap)); 533 534struct vnode * 535 checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp)); 536void vput __P((struct vnode *vp)); 537void vrele __P((struct vnode *vp)); 538void vref __P((struct vnode *vp)); 539void vbusy __P((struct vnode *vp)); 540 541extern vop_t **default_vnodeop_p; 542 543extern TAILQ_HEAD(tobefreelist, vnode) 544 vnode_tobefree_list; /* vnode free list */ 545 546#endif /* KERNEL */ 547 548#endif /* !_SYS_VNODE_H_ */ 549