bsd/sys/vnode.h

   1 /*
   2  * Copyright (c) 2000-2002 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/appleapiopts.h>
  62 #include <sys/cdefs.h>
  63 #include <sys/queue.h>
  64 #include <sys/lock.h>
  65
  66 #include <sys/time.h>
  67 #include <sys/uio.h>
  68
  69 #include <sys/vm.h>
  70 #ifdef KERNEL
  71 #include <sys/systm.h>
  72 #include <vm/vm_pageout.h>
  73 #endif /* KERNEL */
  74
  75 #ifdef __APPLE_API_PRIVATE
  76 /*
  77  * The vnode is the focus of all file activity in UNIX.  There is a
  78  * unique vnode allocated for each active file, each current directory,
  79  * each mounted-on file, text file, and the root.
  80  */
  81
  82 /*
  83  * Vnode types.  VNON means no type.
  84  */
  85 enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD, VSTR,
  86                           VCPLX };
  87
  88 /*
  89  * Vnode tag types.
  90  * These are for the benefit of external programs only (e.g., pstat)
  91  * and should NEVER be inspected by the kernel.
  92  */
  93 enum vtagtype   {
  94         VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS, VT_FDESC,
  95         VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
  96         VT_UNION, VT_HFS, VT_VOLFS, VT_DEVFS, VT_WEBDAV, VT_UDF, VT_AFP,
  97         VT_CDDA, VT_CIFS,VT_OTHER};
  98
  99 /*
 100  * Each underlying filesystem allocates its own private area and hangs
 101  * it from v_data.  If non-null, this area is freed in getnewvnode().
 102  */
 103 LIST_HEAD(buflists, buf);
 104
 105 #define MAX_CLUSTERS 4  /* maximum number of vfs clusters per vnode */
 106
 107 struct v_cluster {
 108         unsigned int    start_pg;
 109         unsigned int    last_pg;
 110 };
 111
 112 struct v_padded_clusters {
 113         long    v_pad;
 114         struct v_cluster        v_c[MAX_CLUSTERS];
 115 };
 116
 117 /*
 118  * Reading or writing any of these items requires holding the appropriate lock.
 119  * v_freelist is locked by the global vnode_free_list simple lock.
 120  * v_mntvnodes is locked by the global mntvnodes simple lock.
 121  * v_flag, v_usecount, v_holdcount and v_writecount are
 122  * locked by the v_interlock simple lock.
 123  */
 124 struct vnode {
 125         u_long  v_flag;                         /* vnode flags (see below) */
 126         long    v_usecount;                     /* reference count of users */
 127         long    v_holdcnt;                      /* page & buffer references */
 128         daddr_t v_lastr;                        /* last read (read-ahead) */
 129         u_long  v_id;                           /* capability identifier */
 130         struct  mount *v_mount;                 /* ptr to vfs we are in */
 131         int     (**v_op)(void *);               /* vnode operations vector */
 132         TAILQ_ENTRY(vnode) v_freelist;          /* vnode freelist */
 133         LIST_ENTRY(vnode) v_mntvnodes;          /* vnodes for mount point */
 134         struct  buflists v_cleanblkhd;          /* clean blocklist head */
 135         struct  buflists v_dirtyblkhd;          /* dirty blocklist head */
 136         long    v_numoutput;                    /* num of writes in progress */
 137         enum    vtype v_type;                   /* vnode type */
 138         union {
 139                 struct mount    *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
 140                 struct socket   *vu_socket;     /* unix ipc (VSOCK) */
 141                 struct specinfo *vu_specinfo;   /* device (VCHR, VBLK) */
 142                 struct fifoinfo *vu_fifoinfo;   /* fifo (VFIFO) */
 143         } v_un;
 144         struct ubc_info *v_ubcinfo;     /* valid for (VREG) */
 145         struct  nqlease *v_lease;               /* Soft reference to lease */
 146         daddr_t v_lastw;                        /* last write (write cluster) */
 147         daddr_t v_cstart;                       /* start block of cluster */
 148         daddr_t v_ciosiz;                       /* real size of I/O for cluster */
 149         int     v_clen;                         /* length of current cluster */
 150         int     v_ralen;                        /* Read-ahead length */
 151         daddr_t v_maxra;                        /* last readahead block */
 152         union {
 153                 simple_lock_data_t v_ilk;       /* lock on usecount and flag */
 154                 struct v_padded_clusters v_cl;  /* vfs cluster IO */
 155         } v_un1;
 156 #define v_clusters v_un1.v_cl.v_c
 157 #define v_interlock v_un1.v_ilk
 158
 159         struct  lock__bsd__ *v_vnlock;          /* used for non-locking fs's */
 160         long    v_writecount;                   /* reference count of writers */
 161         enum    vtagtype v_tag;                 /* type of underlying data */
 162         void    *v_data;                        /* private data for fs */
 163 };
 164 #define v_mountedhere   v_un.vu_mountedhere
 165 #define v_socket        v_un.vu_socket
 166 #define v_specinfo      v_un.vu_specinfo
 167 #define v_fifoinfo      v_un.vu_fifoinfo
 168
 169 /*
 170  * Vnode flags.
 171  */
 172 #define VROOT           0x000001        /* root of its file system */
 173 #define VTEXT           0x000002        /* vnode is a pure text prototype */
 174 #define VSYSTEM         0x000004        /* vnode being used by kernel */
 175 #define VISTTY          0x000008        /* vnode represents a tty */
 176 #define VWASMAPPED      0x000010        /* vnode was mapped before */
 177 #define VTERMINATE      0x000020        /* terminating memory object */
 178 #define VTERMWANT       0x000040        /* wating for memory object death */
 179 #define VMOUNT          0x000080        /* mount operation in progress */
 180 #define VXLOCK          0x000100        /* vnode is locked to change underlying type */
 181 #define VXWANT          0x000200        /* process is waiting for vnode */
 182 #define VBWAIT          0x000400        /* waiting for output to complete */
 183 #define VALIASED        0x000800        /* vnode has an alias */
 184 #define VORECLAIM       0x001000        /* vm object is being reclaimed */
 185 #define VNOCACHE_DATA   0x002000        /* don't keep data cached once it's been consumed */
 186 #define VSTANDARD       0x004000        /* vnode obtained from common pool */
 187 #define VAGE            0x008000        /* Insert vnode at head of free list */
 188 #define VRAOFF          0x010000        /* read ahead disabled */
 189 #define VUINIT          0x020000        /* ubc_info being initialized */
 190 #define VUWANT          0x040000        /* process is wating for VUINIT */
 191 #define VUINACTIVE      0x080000        /* UBC vnode is on inactive list */
 192 #define VHASDIRTY       0x100000        /* UBC vnode may have 1 or more */
 193                 /* delayed dirty pages that need to be flushed at the next 'sync' */
 194 #define VSWAP           0x200000        /* vnode is being used as swapfile */
 195 #define VTHROTTLED      0x400000        /* writes or pageouts have been throttled */
 196                 /* wakeup tasks waiting when count falls below threshold */
 197 #define VNOFLUSH        0x800000        /* don't vflush() if SKIPSYSTEM */
 198
 199
 200 /*
 201  * Vnode attributes.  A field value of VNOVAL represents a field whose value
 202  * is unavailable (getattr) or which is not to be changed (setattr).
 203  */
 204 struct vattr {
 205         enum vtype      va_type;        /* vnode type (for create) */
 206         u_short         va_mode;        /* files access mode and type */
 207         short           va_nlink;       /* number of references to file */
 208         uid_t           va_uid;         /* owner user id */
 209         gid_t           va_gid;         /* owner group id */
 210         long            va_fsid;        /* file system id (dev for now) */
 211         long            va_fileid;      /* file id */
 212         u_quad_t        va_size;        /* file size in bytes */
 213         long            va_blocksize;   /* blocksize preferred for i/o */
 214         struct timespec va_atime;       /* time of last access */
 215         struct timespec va_mtime;       /* time of last modification */
 216         struct timespec va_ctime;       /* time file changed */
 217         u_long          va_gen;         /* generation number of file */
 218         u_long          va_flags;       /* flags defined for file */
 219         dev_t           va_rdev;        /* device the special file represents */
 220         u_quad_t        va_bytes;       /* bytes of disk space held by file */
 221         u_quad_t        va_filerev;     /* file modification number */
 222         u_int           va_vaflags;     /* operations flags, see below */
 223         long            va_spare;       /* remain quad aligned */
 224 };
 225
 226 /*
 227  * Flags for va_vaflags.
 228  */
 229 #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
 230 #define VA_EXCLUSIVE    0x02            /* exclusive create request */
 231
 232 /*
 233  * Flags for ioflag.
 234  */
 235 #define IO_UNIT         0x01            /* do I/O as atomic unit */
 236 #define IO_APPEND       0x02            /* append write to end */
 237 #define IO_SYNC         0x04            /* do I/O synchronously */
 238 #define IO_NODELOCKED   0x08            /* underlying node already locked */
 239 #define IO_NDELAY       0x10            /* FNDELAY flag set in file table */
 240 #define IO_NOZEROFILL   0x20            /* F_SETSIZE fcntl uses to prevent zero filling */
 241 #define IO_TAILZEROFILL 0x40            /* zero fills at the tail of write */
 242 #define IO_HEADZEROFILL 0x80            /* zero fills at the head of write */
 243 #define IO_NOZEROVALID  0x100           /* do not zero fill if valid page */
 244 #define IO_NOZERODIRTY  0x200           /* do not zero fill if page is dirty */
 245
 246 /*
 247  *  Modes.  Some values same as Ixxx entries from inode.h for now.
 248  */
 249 #define VSUID   04000           /* set user id on execution */
 250 #define VSGID   02000           /* set group id on execution */
 251 #define VSVTX   01000           /* save swapped text even after use */
 252 #define VREAD   00400           /* read, write, execute permissions */
 253 #define VWRITE  00200
 254 #define VEXEC   00100
 255
 256 /*
 257  * Token indicating no attribute value yet assigned.
 258  */
 259 #define VNOVAL  (-1)
 260
 261 #ifdef KERNEL
 262 /*
 263  * Convert between vnode types and inode formats (since POSIX.1
 264  * defines mode word of stat structure in terms of inode formats).
 265  */
 266 extern enum vtype       iftovt_tab[];
 267 extern int              vttoif_tab[];
 268 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
 269 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
 270 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
 271
 272 /*
 273  * Flags to various vnode functions.
 274  */
 275 #define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
 276 #define FORCECLOSE      0x0002          /* vflush: force file closeure */
 277 #define WRITECLOSE      0x0004          /* vflush: only close writeable files */
 278 #define SKIPSWAP        0x0008          /* vflush: skip vnodes marked VSWAP */
 279
 280 #define DOCLOSE         0x0008          /* vclean: close active files */
 281
 282 #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
 283 #define V_SAVEMETA      0x0002          /* vinvalbuf: leave indirect blocks */
 284
 285 #define REVOKEALL       0x0001          /* vop_revoke: revoke all aliases */
 286
 287 /* flags for vop_allocate */
 288 #define PREALLOCATE             0x00000001      /* preallocate allocation blocks */
 289 #define ALLOCATECONTIG  0x00000002      /* allocate contigious space */
 290 #define ALLOCATEALL             0x00000004      /* allocate all requested space */
 291                                                                         /* or no space at all */
 292 #define FREEREMAINDER   0x00000008      /* deallocate allocated but */
 293                                                                         /* unfilled blocks */
 294 #define ALLOCATEFROMPEOF        0x00000010      /* allocate from the physical eof */
 295 #define ALLOCATEFROMVOL         0x00000020      /* allocate from the volume offset */
 296
 297 #if DIAGNOSTIC
 298 #define VATTR_NULL(vap) vattr_null(vap)
 299 #define HOLDRELE(vp)    holdrele(vp)
 300 #define VHOLD(vp)       vhold(vp)
 301
 302 void    holdrele __P((struct vnode *));
 303 void    vattr_null __P((struct vattr *));
 304 void    vhold __P((struct vnode *));
 305 #else
 306 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
 307 #define HOLDRELE(vp)    holdrele(vp)            /* decrease buf or page ref */
 308 extern __inline void holdrele(struct vnode *vp)
 309 {
 310         simple_lock(&vp->v_interlock);
 311         vp->v_holdcnt--;
 312         simple_unlock(&vp->v_interlock);
 313 }
 314 #define VHOLD(vp)       vhold(vp)               /* increase buf or page ref */
 315 extern __inline void vhold(struct vnode *vp)
 316 {
 317         simple_lock(&vp->v_interlock);
 318         if (++vp->v_holdcnt <= 0)
 319                 panic("vhold: v_holdcnt");
 320         simple_unlock(&vp->v_interlock);
 321 }
 322 #endif /* DIAGNOSTIC */
 323
 324 #define VREF(vp)        vref(vp)
 325 void    vref __P((struct vnode *));
 326 #define NULLVP  ((struct vnode *)NULL)
 327
 328 /*
 329  * Global vnode data.
 330  */
 331 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
 332 extern  int desiredvnodes;              /* number of vnodes desired */
 333 extern  struct vattr va_null;           /* predefined null vattr structure */
 334
 335 /*
 336  * Macro/function to check for client cache inconsistency w.r.t. leasing.
 337  */
 338 #define LEASE_READ      0x1             /* Check lease for readers */
 339 #define LEASE_WRITE     0x2             /* Check lease for modifiers */
 340 #endif /* KERNEL */
 341
 342 /*
 343  * Mods for exensibility.
 344  */
 345
 346 /*
 347  * Flags for vdesc_flags:
 348  */
 349 #define VDESC_MAX_VPS           16
 350 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
 351 #define VDESC_VP0_WILLRELE      0x0001
 352 #define VDESC_VP1_WILLRELE      0x0002
 353 #define VDESC_VP2_WILLRELE      0x0004
 354 #define VDESC_VP3_WILLRELE      0x0008
 355 #define VDESC_NOMAP_VPP         0x0100
 356 #define VDESC_VPP_WILLRELE      0x0200
 357
 358 /*
 359  * VDESC_NO_OFFSET is used to identify the end of the offset list
 360  * and in places where no such field exists.
 361  */
 362 #define VDESC_NO_OFFSET -1
 363
 364 /*
 365  * This structure describes the vnode operation taking place.
 366  */
 367 struct vnodeop_desc {
 368         int     vdesc_offset;           /* offset in vector--first for speed */
 369         char    *vdesc_name;            /* a readable name for debugging */
 370         int     vdesc_flags;            /* VDESC_* flags */
 371
 372         /*
 373          * These ops are used by bypass routines to map and locate arguments.
 374          * Creds and procs are not needed in bypass routines, but sometimes
 375          * they are useful to (for example) transport layers.
 376          * Nameidata is useful because it has a cred in it.
 377          */
 378         int     *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
 379         int     vdesc_vpp_offset;       /* return vpp location */
 380         int     vdesc_cred_offset;      /* cred location, if any */
 381         int     vdesc_proc_offset;      /* proc location, if any */
 382         int     vdesc_componentname_offset; /* if any */
 383         /*
 384          * Finally, we've got a list of private data (about each operation)
 385          * for each transport layer.  (Support to manage this list is not
 386          * yet part of BSD.)
 387          */
 388         caddr_t *vdesc_transports;
 389 };
 390
 391 #endif /* __APPLE_API_PRIVATE */
 392
 393 #ifdef KERNEL
 394
 395 #ifdef __APPLE_API_PRIVATE
 396 /*
 397  * A list of all the operation descs.
 398  */
 399 extern struct vnodeop_desc *vnodeop_descs[];
 400
 401 /*
 402  * Interlock for scanning list of vnodes attached to a mountpoint
 403  */
 404 extern struct slock mntvnode_slock;
 405
 406 /*
 407  * This macro is very helpful in defining those offsets in the vdesc struct.
 408  *
 409  * This is stolen from X11R4.  I ingored all the fancy stuff for
 410  * Crays, so if you decide to port this to such a serious machine,
 411  * you might want to consult Intrisics.h's XtOffset{,Of,To}.
 412  */
 413 #define VOPARG_OFFSET(p_type,field) \
 414         ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
 415 #define VOPARG_OFFSETOF(s_type,field) \
 416         VOPARG_OFFSET(s_type*,field)
 417 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
 418         ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
 419
 420
 421 /*
 422  * This structure is used to configure the new vnodeops vector.
 423  */
 424 struct vnodeopv_entry_desc {
 425         struct vnodeop_desc *opve_op;   /* which operation this is */
 426         int (*opve_impl)(void *);               /* code implementing this operation */
 427 };
 428 struct vnodeopv_desc {
 429                         /* ptr to the ptr to the vector where op should go */
 430         int (***opv_desc_vector_p)(void *);
 431         struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
 432 };
 433
 434 /*
 435  * A default routine which just returns an error.
 436  */
 437 int vn_default_error __P((void));
 438
 439 /*
 440  * A generic structure.
 441  * This can be used by bypass routines to identify generic arguments.
 442  */
 443 struct vop_generic_args {
 444         struct vnodeop_desc *a_desc;
 445         /* other random data follows, presumably */
 446 };
 447
 448 /*
 449  * VOCALL calls an op given an ops vector.  We break it out because BSD's
 450  * vclean changes the ops vector and then wants to call ops with the old
 451  * vector.
 452  */
 453 #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
 454
 455 /*
 456  * This call works for vnodes in the kernel.
 457  */
 458 #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
 459 #define VDESC(OP) (& __CONCAT(OP,_desc))
 460 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
 461
 462 #endif /* __APPLE_API_PRIVATE */
 463
 464 /*
 465  * Finally, include the default set of vnode operations.
 466  */
 467 #include <sys/vnode_if.h>
 468
 469 /*
 470  * vnode manipulation functions.
 471  */
 472 struct file;
 473 struct mount;
 474 struct nameidata;
 475 struct ostat;
 476 struct proc;
 477 struct stat;
 478 struct ucred;
 479 struct uio;
 480 struct vattr;
 481 struct vnode;
 482 struct vop_bwrite_args;
 483
 484 #ifdef __APPLE_API_EVOLVING
 485 int     bdevvp __P((dev_t dev, struct vnode **vpp));
 486 void    cvtstat __P((struct stat *st, struct ostat *ost));
 487 int     getnewvnode __P((enum vtagtype tag,
 488             struct mount *mp, int (**vops)(void *), struct vnode **vpp));
 489 void    insmntque __P((struct vnode *vp, struct mount *mp));
 490 void    vattr_null __P((struct vattr *vap));
 491 int     vcount __P((struct vnode *vp));
 492 int     vflush __P((struct mount *mp, struct vnode *skipvp, int flags));
 493 int     vget __P((struct vnode *vp, int lockflag, struct proc *p));
 494 void    vgone __P((struct vnode *vp));
 495 int     vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
 496             struct proc *p, int slpflag, int slptimeo));
 497 void    vprint __P((char *label, struct vnode *vp));
 498 int     vrecycle __P((struct vnode *vp, struct slock *inter_lkp,
 499             struct proc *p));
 500 int     vn_bwrite __P((struct vop_bwrite_args *ap));
 501 int     vn_close __P((struct vnode *vp,
 502             int flags, struct ucred *cred, struct proc *p));
 503 int     vn_lock __P((struct vnode *vp, int flags, struct proc *p));
 504 int     vn_open __P((struct nameidata *ndp, int fmode, int cmode));
 505 int     vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
 506             int len, off_t offset, enum uio_seg segflg, int ioflg,
 507             struct ucred *cred, int *aresid, struct proc *p));
 508 int     vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p));
 509 int     vop_noislocked __P((struct vop_islocked_args *));
 510 int     vop_nolock __P((struct vop_lock_args *));
 511 int     vop_nounlock __P((struct vop_unlock_args *));
 512 int     vop_revoke __P((struct vop_revoke_args *));
 513 struct vnode *
 514         checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
 515 void    vput __P((struct vnode *vp));
 516 void    vrele __P((struct vnode *vp));
 517 int     vaccess __P((mode_t file_mode, uid_t uid, gid_t gid,
 518             mode_t acc_mode, struct ucred *cred));
 519 int     getvnode __P((struct proc *p, int fd, struct file **fpp));
 520 #endif __APPLE_API_EVOLVING
 521
 522 #endif /* KERNEL */
 523
 524 #endif /* !_VNODE_H_ */