bsd/sys/vnode.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1989, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      @(#)vnode.h     8.17 (Berkeley) 5/20/95
  56  */
  57
  58 #ifndef _VNODE_H_
  59 #define _VNODE_H_
  60
  61 #include <sys/cdefs.h>
  62 #include <sys/queue.h>
  63 #include <sys/lock.h>
  64
  65 #include <sys/time.h>
  66 #include <sys/uio.h>
  67
  68 #include <sys/vm.h>
  69 #ifdef KERNEL
  70 #include <sys/systm.h>
  71 #include <vm/vm_pageout.h>
  72 #endif
  73
  74 /*
  75  * The vnode is the focus of all file activity in UNIX.  There is a
  76  * unique vnode allocated for each active file, each current directory,
  77  * each mounted-on file, text file, and the root.
  78  */
  79
  80 /*
  81  * Vnode types.  VNON means no type.
  82  */
  83 enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD, VSTR,
  84                           VCPLX };
  85
  86 /*
  87  * Vnode tag types.
  88  * These are for the benefit of external programs only (e.g., pstat)
  89  * and should NEVER be inspected by the kernel.
  90  */
  91 enum vtagtype   {
  92         VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS, VT_FDESC,
  93         VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
  94         VT_UNION, VT_HFS, VT_VOLFS, VT_DEVFS, VT_WEBDAV, VT_UDF, VT_AFP,
  95         VT_CDDA, VT_CIFS,VT_OTHER};
  96
  97 /*
  98  * Each underlying filesystem allocates its own private area and hangs
  99  * it from v_data.  If non-null, this area is freed in getnewvnode().
 100  */
 101 LIST_HEAD(buflists, buf);
 102
 103 /*
 104  * Reading or writing any of these items requires holding the appropriate lock.
 105  * v_freelist is locked by the global vnode_free_list simple lock.
 106  * v_mntvnodes is locked by the global mntvnodes simple lock.
 107  * v_flag, v_usecount, v_holdcount and v_writecount are
 108  *    locked by the v_interlock simple lock.
 109  */
 110 struct vnode {
 111         u_long  v_flag;                         /* vnode flags (see below) */
 112         long    v_usecount;                     /* reference count of users */
 113         long    v_holdcnt;                      /* page & buffer references */
 114         daddr_t v_lastr;                        /* last read (read-ahead) */
 115         u_long  v_id;                           /* capability identifier */
 116         struct  mount *v_mount;                 /* ptr to vfs we are in */
 117         int     (**v_op)(void *);               /* vnode operations vector */
 118         TAILQ_ENTRY(vnode) v_freelist;          /* vnode freelist */
 119         LIST_ENTRY(vnode) v_mntvnodes;          /* vnodes for mount point */
 120         struct  buflists v_cleanblkhd;          /* clean blocklist head */
 121         struct  buflists v_dirtyblkhd;          /* dirty blocklist head */
 122         long    v_numoutput;                    /* num of writes in progress */
 123         enum    vtype v_type;                   /* vnode type */
 124         union {
 125                 struct mount    *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
 126                 struct socket   *vu_socket;     /* unix ipc (VSOCK) */
 127                 struct specinfo *vu_specinfo;   /* device (VCHR, VBLK) */
 128                 struct fifoinfo *vu_fifoinfo;   /* fifo (VFIFO) */
 129         } v_un;
 130         struct ubc_info *v_ubcinfo;     /* valid for (VREG) */
 131         struct  nqlease *v_lease;               /* Soft reference to lease */
 132         daddr_t v_lastw;                        /* last write (write cluster) */
 133         daddr_t v_cstart;                       /* start block of cluster */
 134         daddr_t v_ciosiz;                       /* real size of I/O for cluster */
 135         int     v_clen;                         /* length of current cluster */
 136         int     v_ralen;                        /* Read-ahead length */
 137         daddr_t v_maxra;                        /* last readahead block */
 138         simple_lock_data_t v_interlock;         /* lock on usecount and flag */
 139         struct  lock__bsd__ *v_vnlock;          /* used for non-locking fs's */
 140         long    v_writecount;                   /* reference count of writers */
 141         enum    vtagtype v_tag;                 /* type of underlying data */
 142         void    *v_data;                        /* private data for fs */
 143 };
 144 #define v_mountedhere   v_un.vu_mountedhere
 145 #define v_socket        v_un.vu_socket
 146 #define v_specinfo      v_un.vu_specinfo
 147 #define v_fifoinfo      v_un.vu_fifoinfo
 148
 149 /*
 150  * Vnode flags.
 151  */
 152 #define VROOT           0x000001        /* root of its file system */
 153 #define VTEXT           0x000002        /* vnode is a pure text prototype */
 154 #define VSYSTEM         0x000004        /* vnode being used by kernel */
 155 #define VISTTY          0x000008        /* vnode represents a tty */
 156 #define VWASMAPPED      0x000010        /* vnode was mapped before */
 157 #define VTERMINATE      0x000020        /* terminating memory object */
 158 #define VTERMWANT       0x000040        /* wating for memory object death */
 159 #define VMOUNT          0x000080        /* mount operation in progress */
 160 #define VXLOCK          0x000100        /* vnode is locked to change underlying type */
 161 #define VXWANT          0x000200        /* process is waiting for vnode */
 162 #define VBWAIT          0x000400        /* waiting for output to complete */
 163 #define VALIASED        0x000800        /* vnode has an alias */
 164 #define VORECLAIM       0x001000        /* vm object is being reclaimed */
 165 #define VNOCACHE_DATA   0x002000        /* don't keep data cached once it's been consumed */
 166 #define VSTANDARD       0x004000        /* vnode obtained from common pool */
 167 #define VAGE            0x008000        /* Insert vnode at head of free list */
 168 #define VRAOFF          0x010000        /* read ahead disabled */
 169 #define VUINIT          0x020000        /* ubc_info being initialized */
 170 #define VUWANT          0x040000        /* process is wating for VUINIT */
 171 #define VUINACTIVE      0x080000        /* UBC vnode is on inactive list */
 172 #define VHASDIRTY       0x100000        /* UBC vnode may have 1 or more */
 173                 /* delayed dirty pages that need to be flushed at the next 'sync' */
 174 #define VSWAP           0x200000        /* vnode is being used as swapfile */
 175 #define VTHROTTLED      0x400000        /* writes or pageouts have been throttled */
 176                 /* wakeup tasks waiting when count falls below threshold */
 177
 178 /*
 179  * Vnode attributes.  A field value of VNOVAL represents a field whose value
 180  * is unavailable (getattr) or which is not to be changed (setattr).
 181  */
 182 struct vattr {
 183         enum vtype      va_type;        /* vnode type (for create) */
 184         u_short         va_mode;        /* files access mode and type */
 185         short           va_nlink;       /* number of references to file */
 186         uid_t           va_uid;         /* owner user id */
 187         gid_t           va_gid;         /* owner group id */
 188         long            va_fsid;        /* file system id (dev for now) */
 189         long            va_fileid;      /* file id */
 190         u_quad_t        va_size;        /* file size in bytes */
 191         long            va_blocksize;   /* blocksize preferred for i/o */
 192         struct timespec va_atime;       /* time of last access */
 193         struct timespec va_mtime;       /* time of last modification */
 194         struct timespec va_ctime;       /* time file changed */
 195         u_long          va_gen;         /* generation number of file */
 196         u_long          va_flags;       /* flags defined for file */
 197         dev_t           va_rdev;        /* device the special file represents */
 198         u_quad_t        va_bytes;       /* bytes of disk space held by file */
 199         u_quad_t        va_filerev;     /* file modification number */
 200         u_int           va_vaflags;     /* operations flags, see below */
 201         long            va_spare;       /* remain quad aligned */
 202 };
 203
 204 /*
 205  * Flags for va_vaflags.
 206  */
 207 #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
 208 #define VA_EXCLUSIVE    0x02            /* exclusive create request */
 209
 210 /*
 211  * Flags for ioflag.
 212  */
 213 #define IO_UNIT         0x01            /* do I/O as atomic unit */
 214 #define IO_APPEND       0x02            /* append write to end */
 215 #define IO_SYNC         0x04            /* do I/O synchronously */
 216 #define IO_NODELOCKED   0x08            /* underlying node already locked */
 217 #define IO_NDELAY       0x10            /* FNDELAY flag set in file table */
 218 #define IO_NOZEROFILL   0x20            /* F_SETSIZE fcntl uses to prevent zero filling */
 219 #define IO_TAILZEROFILL 0x40            /* zero fills at the tail of write */
 220 #define IO_HEADZEROFILL 0x80            /* zero fills at the head of write */
 221 #define IO_NOZEROVALID  0x100           /* do not zero fill if valid page */
 222
 223 /*
 224  *  Modes.  Some values same as Ixxx entries from inode.h for now.
 225  */
 226 #define VSUID   04000           /* set user id on execution */
 227 #define VSGID   02000           /* set group id on execution */
 228 #define VSVTX   01000           /* save swapped text even after use */
 229 #define VREAD   00400           /* read, write, execute permissions */
 230 #define VWRITE  00200
 231 #define VEXEC   00100
 232
 233 /*
 234  * Token indicating no attribute value yet assigned.
 235  */
 236 #define VNOVAL  (-1)
 237
 238 #ifdef KERNEL
 239 /*
 240  * Convert between vnode types and inode formats (since POSIX.1
 241  * defines mode word of stat structure in terms of inode formats).
 242  */
 243 extern enum vtype       iftovt_tab[];
 244 extern int              vttoif_tab[];
 245 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
 246 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
 247 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
 248
 249 /*
 250  * Flags to various vnode functions.
 251  */
 252 #define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
 253 #define FORCECLOSE      0x0002          /* vflush: force file closeure */
 254 #define WRITECLOSE      0x0004          /* vflush: only close writeable files */
 255 #define SKIPSWAP        0x0008          /* vflush: skip vnodes marked VSWAP */
 256
 257 #define DOCLOSE         0x0008          /* vclean: close active files */
 258
 259 #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
 260 #define V_SAVEMETA      0x0002          /* vinvalbuf: leave indirect blocks */
 261
 262 #define REVOKEALL       0x0001          /* vop_revoke: revoke all aliases */
 263
 264 /* flags for vop_allocate */
 265 #define PREALLOCATE             0x00000001      /* preallocate allocation blocks */
 266 #define ALLOCATECONTIG  0x00000002      /* allocate contigious space */
 267 #define ALLOCATEALL             0x00000004      /* allocate all requested space */
 268                                                                         /* or no space at all */
 269 #define FREEREMAINDER   0x00000008      /* deallocate allocated but */
 270                                                                         /* unfilled blocks */
 271 #define ALLOCATEFROMPEOF        0x00000010      /* allocate from the physical eof */
 272 #define ALLOCATEFROMVOL         0x00000020      /* allocate from the volume offset */
 273
 274 #if DIAGNOSTIC
 275 #define VATTR_NULL(vap) vattr_null(vap)
 276 #define HOLDRELE(vp)    holdrele(vp)
 277 #define VHOLD(vp)       vhold(vp)
 278
 279 void    holdrele __P((struct vnode *));
 280 void    vattr_null __P((struct vattr *));
 281 void    vhold __P((struct vnode *));
 282 #else
 283 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
 284 #define HOLDRELE(vp)    holdrele(vp)            /* decrease buf or page ref */
 285 extern __inline void holdrele(struct vnode *vp)
 286 {
 287         simple_lock(&vp->v_interlock);
 288         vp->v_holdcnt--;
 289         simple_unlock(&vp->v_interlock);
 290 }
 291 #define VHOLD(vp)       vhold(vp)               /* increase buf or page ref */
 292 extern __inline void vhold(struct vnode *vp)
 293 {
 294         simple_lock(&vp->v_interlock);
 295         if (++vp->v_holdcnt <= 0)
 296                 panic("vhold: v_holdcnt");
 297         simple_unlock(&vp->v_interlock);
 298 }
 299 #endif /* DIAGNOSTIC */
 300
 301 #define VREF(vp)        vref(vp)
 302 void    vref __P((struct vnode *));
 303 #define NULLVP  ((struct vnode *)NULL)
 304
 305 /*
 306  * Global vnode data.
 307  */
 308 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
 309 extern  int desiredvnodes;              /* number of vnodes desired */
 310 extern  struct vattr va_null;           /* predefined null vattr structure */
 311
 312 /*
 313  * Macro/function to check for client cache inconsistency w.r.t. leasing.
 314  */
 315 #define LEASE_READ      0x1             /* Check lease for readers */
 316 #define LEASE_WRITE     0x2             /* Check lease for modifiers */
 317
 318 #endif /* KERNEL */
 319
 320 /*
 321  * Mods for exensibility.
 322  */
 323
 324 /*
 325  * Flags for vdesc_flags:
 326  */
 327 #define VDESC_MAX_VPS           16
 328 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
 329 #define VDESC_VP0_WILLRELE      0x0001
 330 #define VDESC_VP1_WILLRELE      0x0002
 331 #define VDESC_VP2_WILLRELE      0x0004
 332 #define VDESC_VP3_WILLRELE      0x0008
 333 #define VDESC_NOMAP_VPP         0x0100
 334 #define VDESC_VPP_WILLRELE      0x0200
 335
 336 /*
 337  * VDESC_NO_OFFSET is used to identify the end of the offset list
 338  * and in places where no such field exists.
 339  */
 340 #define VDESC_NO_OFFSET -1
 341
 342 /*
 343  * This structure describes the vnode operation taking place.
 344  */
 345 struct vnodeop_desc {
 346         int     vdesc_offset;           /* offset in vector--first for speed */
 347         char    *vdesc_name;            /* a readable name for debugging */
 348         int     vdesc_flags;            /* VDESC_* flags */
 349
 350         /*
 351          * These ops are used by bypass routines to map and locate arguments.
 352          * Creds and procs are not needed in bypass routines, but sometimes
 353          * they are useful to (for example) transport layers.
 354          * Nameidata is useful because it has a cred in it.
 355          */
 356         int     *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
 357         int     vdesc_vpp_offset;       /* return vpp location */
 358         int     vdesc_cred_offset;      /* cred location, if any */
 359         int     vdesc_proc_offset;      /* proc location, if any */
 360         int     vdesc_componentname_offset; /* if any */
 361         /*
 362          * Finally, we've got a list of private data (about each operation)
 363          * for each transport layer.  (Support to manage this list is not
 364          * yet part of BSD.)
 365          */
 366         caddr_t *vdesc_transports;
 367 };
 368
 369 #ifdef KERNEL
 370 /*
 371  * A list of all the operation descs.
 372  */
 373 extern struct vnodeop_desc *vnodeop_descs[];
 374
 375 /*
 376  * Interlock for scanning list of vnodes attached to a mountpoint
 377  */
 378 extern struct slock mntvnode_slock;
 379
 380 /*
 381  * This macro is very helpful in defining those offsets in the vdesc struct.
 382  *
 383  * This is stolen from X11R4.  I ingored all the fancy stuff for
 384  * Crays, so if you decide to port this to such a serious machine,
 385  * you might want to consult Intrisics.h's XtOffset{,Of,To}.
 386  */
 387 #define VOPARG_OFFSET(p_type,field) \
 388         ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
 389 #define VOPARG_OFFSETOF(s_type,field) \
 390         VOPARG_OFFSET(s_type*,field)
 391 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
 392         ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
 393
 394
 395 /*
 396  * This structure is used to configure the new vnodeops vector.
 397  */
 398 struct vnodeopv_entry_desc {
 399         struct vnodeop_desc *opve_op;   /* which operation this is */
 400         int (*opve_impl)(void *);               /* code implementing this operation */
 401 };
 402 struct vnodeopv_desc {
 403                         /* ptr to the ptr to the vector where op should go */
 404         int (***opv_desc_vector_p)(void *);
 405         struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
 406 };
 407
 408 /*
 409  * A default routine which just returns an error.
 410  */
 411 int vn_default_error __P((void));
 412
 413 /*
 414  * A generic structure.
 415  * This can be used by bypass routines to identify generic arguments.
 416  */
 417 struct vop_generic_args {
 418         struct vnodeop_desc *a_desc;
 419         /* other random data follows, presumably */
 420 };
 421
 422 /*
 423  * VOCALL calls an op given an ops vector.  We break it out because BSD's
 424  * vclean changes the ops vector and then wants to call ops with the old
 425  * vector.
 426  */
 427 #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
 428
 429 /*
 430  * This call works for vnodes in the kernel.
 431  */
 432 #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
 433 #define VDESC(OP) (& __CONCAT(OP,_desc))
 434 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
 435
 436 /*
 437  * Finally, include the default set of vnode operations.
 438  */
 439 #include <sys/vnode_if.h>
 440
 441 /*
 442  * Public vnode manipulation functions.
 443  */
 444 struct file;
 445 struct mount;
 446 struct nameidata;
 447 struct ostat;
 448 struct proc;
 449 struct stat;
 450 struct ucred;
 451 struct uio;
 452 struct vattr;
 453 struct vnode;
 454 struct vop_bwrite_args;
 455
 456 int     bdevvp __P((dev_t dev, struct vnode **vpp));
 457 void    cvtstat __P((struct stat *st, struct ostat *ost));
 458 int     getnewvnode __P((enum vtagtype tag,
 459             struct mount *mp, int (**vops)(void *), struct vnode **vpp));
 460 void    insmntque __P((struct vnode *vp, struct mount *mp));
 461 void    vattr_null __P((struct vattr *vap));
 462 int     vcount __P((struct vnode *vp));
 463 int     vflush __P((struct mount *mp, struct vnode *skipvp, int flags));
 464 int     vget __P((struct vnode *vp, int lockflag, struct proc *p));
 465 void    vgone __P((struct vnode *vp));
 466 int     vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
 467             struct proc *p, int slpflag, int slptimeo));
 468 void    vprint __P((char *label, struct vnode *vp));
 469 int     vrecycle __P((struct vnode *vp, struct slock *inter_lkp,
 470             struct proc *p));
 471 int     vn_bwrite __P((struct vop_bwrite_args *ap));
 472 int     vn_close __P((struct vnode *vp,
 473             int flags, struct ucred *cred, struct proc *p));
 474 int     vn_closefile __P((struct file *fp, struct proc *p));
 475 int     vn_ioctl __P((struct file *fp, u_long com, caddr_t data,
 476             struct proc *p));
 477 int     vn_lock __P((struct vnode *vp, int flags, struct proc *p));
 478 int     vn_open __P((struct nameidata *ndp, int fmode, int cmode));
 479 int     vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
 480             int len, off_t offset, enum uio_seg segflg, int ioflg,
 481             struct ucred *cred, int *aresid, struct proc *p));
 482 int     vn_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
 483 int     vn_select __P((struct file *fp, int which, void * wql, struct proc *p));
 484 int     vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p));
 485 int     vn_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
 486 int     vop_noislocked __P((struct vop_islocked_args *));
 487 int     vop_nolock __P((struct vop_lock_args *));
 488 int     vop_nounlock __P((struct vop_unlock_args *));
 489 int     vop_revoke __P((struct vop_revoke_args *));
 490 struct vnode *
 491         checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
 492 void    vput __P((struct vnode *vp));
 493 void    vrele __P((struct vnode *vp));
 494 int     vaccess __P((mode_t file_mode, uid_t uid, gid_t gid,
 495             mode_t acc_mode, struct ucred *cred));
 496 int     getvnode __P((struct proc *p, int fd, struct file **fpp));
 497
 498 #endif /* KERNEL */
 499
 500 #endif /* !_VNODE_H_ */