vnode.h revision 40786
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 1.76 1998/10/29 09:51:28 peter Exp $ 35 */ 36 37#ifndef _SYS_VNODE_H_ 38#define _SYS_VNODE_H_ 39 40#include <sys/queue.h> 41#include <sys/select.h> 42#include <sys/uio.h> 43 44#include <machine/lock.h> 45 46/* 47 * The vnode is the focus of all file activity in UNIX. There is a 48 * unique vnode allocated for each active file, each current directory, 49 * each mounted-on file, text file, and the root. 50 */ 51 52/* 53 * Vnode types. VNON means no type. 54 */ 55enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD }; 56 57/* 58 * Vnode tag types. 59 * These are for the benefit of external programs only (e.g., pstat) 60 * and should NEVER be inspected by the kernel. 61 */ 62enum vtagtype { 63 VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_PC, VT_LFS, VT_LOFS, VT_FDESC, 64 VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS, 65 VT_UNION, VT_MSDOSFS, VT_DEVFS, VT_TFS, VT_VFS, VT_CODA 66}; 67 68/* 69 * Each underlying filesystem allocates its own private area and hangs 70 * it from v_data. If non-null, this area is freed in getnewvnode(). 71 */ 72TAILQ_HEAD(buflists, buf); 73 74typedef int vop_t __P((void *)); 75struct namecache; 76 77/* 78 * Reading or writing any of these items requires holding the appropriate lock. 79 * v_freelist is locked by the global vnode_free_list simple lock. 80 * v_mntvnodes is locked by the global mntvnodes simple lock. 81 * v_flag, v_usecount, v_holdcount and v_writecount are 82 * locked by the v_interlock simple lock. 83 * v_pollinfo is locked by the lock contained inside it. 84 */ 85struct vnode { 86 u_long v_flag; /* vnode flags (see below) */ 87 int v_usecount; /* reference count of users */ 88 int v_writecount; /* reference count of writers */ 89 int v_holdcnt; /* page & buffer references */ 90 daddr_t v_lastr; /* last read (read-ahead) */ 91 u_long v_id; /* capability identifier */ 92 struct mount *v_mount; /* ptr to vfs we are in */ 93 vop_t **v_op; /* vnode operations vector */ 94 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */ 95 LIST_ENTRY(vnode) v_mntvnodes; /* vnodes for mount point */ 96 struct buflists v_cleanblkhd; /* clean blocklist head */ 97 struct buflists v_dirtyblkhd; /* dirty blocklist head */ 98 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */ 99 long v_numoutput; /* num of writes in progress */ 100 enum vtype v_type; /* vnode type */ 101 union { 102 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */ 103 struct socket *vu_socket; /* unix ipc (VSOCK) */ 104 struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */ 105 struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */ 106 } v_un; 107 struct nqlease *v_lease; /* Soft reference to lease */ 108 daddr_t v_lastw; /* last write (write cluster) */ 109 daddr_t v_cstart; /* start block of cluster */ 110 daddr_t v_lasta; /* last allocation */ 111 int v_clen; /* length of current cluster */ 112 int v_maxio; /* maximum I/O cluster size */ 113 struct vm_object *v_object; /* Place to store VM object */ 114 struct simplelock v_interlock; /* lock on usecount and flag */ 115 struct lock *v_vnlock; /* used for non-locking fs's */ 116 enum vtagtype v_tag; /* type of underlying data */ 117 void *v_data; /* private data for fs */ 118 LIST_HEAD(, namecache) v_cache_src; /* Cache entries from us */ 119 TAILQ_HEAD(, namecache) v_cache_dst; /* Cache entries to us */ 120 struct vnode *v_dd; /* .. vnode */ 121 u_long v_ddid; /* .. capability identifier */ 122 struct { 123 struct simplelock vpi_lock; /* lock to protect below */ 124 struct selinfo vpi_selinfo; /* identity of poller(s) */ 125 short vpi_events; /* what they are looking for */ 126 short vpi_revents; /* what has happened */ 127 } v_pollinfo; 128}; 129#define v_mountedhere v_un.vu_mountedhere 130#define v_socket v_un.vu_socket 131#define v_specinfo v_un.vu_specinfo 132#define v_fifoinfo v_un.vu_fifoinfo 133 134#define VN_POLLEVENT(vp, events) \ 135 do { \ 136 if ((vp)->v_pollinfo.vpi_events & (events)) \ 137 vn_pollevent((vp), (events)); \ 138 } while (0) 139 140/* 141 * Vnode flags. 142 */ 143#define VROOT 0x00001 /* root of its file system */ 144#define VTEXT 0x00002 /* vnode is a pure text prototype */ 145#define VSYSTEM 0x00004 /* vnode being used by kernel */ 146#define VISTTY 0x00008 /* vnode represents a tty */ 147#define VXLOCK 0x00100 /* vnode is locked to change underlying type */ 148#define VXWANT 0x00200 /* process is waiting for vnode */ 149#define VBWAIT 0x00400 /* waiting for output to complete */ 150#define VALIASED 0x00800 /* vnode has an alias */ 151#define VDIROP 0x01000 /* LFS: vnode is involved in a directory op */ 152#define VOBJBUF 0x02000 /* Allocate buffers in VM object */ 153#define VNINACT 0x04000 /* LFS: skip ufs_inactive() in lfs_vunref */ 154#define VAGE 0x08000 /* Insert vnode at head of free list */ 155#define VOLOCK 0x10000 /* vnode is locked waiting for an object */ 156#define VOWANT 0x20000 /* a process is waiting for VOLOCK */ 157#define VDOOMED 0x40000 /* This vnode is being recycled */ 158#define VFREE 0x80000 /* This vnode is on the freelist */ 159#define VTBFREE 0x100000 /* This vnode is on the to-be-freelist */ 160#define VONWORKLST 0x200000 /* On syncer work-list */ 161#define VMOUNT 0x400000 /* Mount in progress */ 162 163/* 164 * Vnode attributes. A field value of VNOVAL represents a field whose value 165 * is unavailable (getattr) or which is not to be changed (setattr). 166 */ 167struct vattr { 168 enum vtype va_type; /* vnode type (for create) */ 169 u_short va_mode; /* files access mode and type */ 170 short va_nlink; /* number of references to file */ 171 uid_t va_uid; /* owner user id */ 172 gid_t va_gid; /* owner group id */ 173 long va_fsid; /* file system id (dev for now) */ 174 long va_fileid; /* file id */ 175 u_quad_t va_size; /* file size in bytes */ 176 long va_blocksize; /* blocksize preferred for i/o */ 177 struct timespec va_atime; /* time of last access */ 178 struct timespec va_mtime; /* time of last modification */ 179 struct timespec va_ctime; /* time file changed */ 180 u_long va_gen; /* generation number of file */ 181 u_long va_flags; /* flags defined for file */ 182 dev_t va_rdev; /* device the special file represents */ 183 u_quad_t va_bytes; /* bytes of disk space held by file */ 184 u_quad_t va_filerev; /* file modification number */ 185 u_int va_vaflags; /* operations flags, see below */ 186 long va_spare; /* remain quad aligned */ 187}; 188 189/* 190 * Flags for va_vaflags. 191 */ 192#define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */ 193#define VA_EXCLUSIVE 0x02 /* exclusive create request */ 194 195/* 196 * Flags for ioflag. 197 */ 198#define IO_UNIT 0x01 /* do I/O as atomic unit */ 199#define IO_APPEND 0x02 /* append write to end */ 200#define IO_SYNC 0x04 /* do I/O synchronously */ 201#define IO_NODELOCKED 0x08 /* underlying node already locked */ 202#define IO_NDELAY 0x10 /* FNDELAY flag set in file table */ 203#define IO_VMIO 0x20 /* data already in VMIO space */ 204#define IO_INVAL 0x40 /* invalidate after I/O */ 205 206/* 207 * Modes. Some values same as Ixxx entries from inode.h for now. 208 */ 209#define VSUID 04000 /* set user id on execution */ 210#define VSGID 02000 /* set group id on execution */ 211#define VSVTX 01000 /* save swapped text even after use */ 212#define VREAD 00400 /* read, write, execute permissions */ 213#define VWRITE 00200 214#define VEXEC 00100 215 216/* 217 * Token indicating no attribute value yet assigned. 218 */ 219#define VNOVAL (-1) 220 221#ifdef KERNEL 222 223#ifdef MALLOC_DECLARE 224MALLOC_DECLARE(M_VNODE); 225#endif 226 227/* 228 * Convert between vnode types and inode formats (since POSIX.1 229 * defines mode word of stat structure in terms of inode formats). 230 */ 231extern enum vtype iftovt_tab[]; 232extern 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)) 236 237/* 238 * Flags to various vnode functions. 239 */ 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 */ 246 247#define VREF(vp) vref(vp) 248 249 250#ifdef DIAGNOSTIC 251#define VATTR_NULL(vap) vattr_null(vap) 252#else 253#define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */ 254#endif /* DIAGNOSTIC */ 255 256#define NULLVP ((struct vnode *)NULL) 257 258#if defined(VFS_LKM) && !defined(KLD_MODULE) 259#define VNODEOP_SET(f) DATA_SET(MODVNOPS,f) 260#else 261#define VNODEOP_SET(f) \ 262 SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_mod_opv_init, &f); 263#endif 264 265/* 266 * Global vnode data. 267 */ 268extern struct vnode *rootvnode; /* root (i.e. "/") vnode */ 269extern int desiredvnodes; /* number of vnodes desired */ 270extern time_t syncdelay; /* time to delay syncing vnodes */ 271extern int rushjob; /* # of slots filesys_syncer should run ASAP */ 272extern struct vm_zone *namei_zone; 273extern int prtactive; /* nonzero to call vprint() */ 274extern struct vattr va_null; /* predefined null vattr structure */ 275extern int vfs_ioopt; 276 277/* 278 * Macro/function to check for client cache inconsistency w.r.t. leasing. 279 */ 280#define LEASE_READ 0x1 /* Check lease for readers */ 281#define LEASE_WRITE 0x2 /* Check lease for modifiers */ 282 283 284extern void (*lease_updatetime) __P((int deltat)); 285 286#define VSHOULDFREE(vp) \ 287 (!((vp)->v_flag & (VFREE|VDOOMED)) && \ 288 !(vp)->v_holdcnt && !(vp)->v_usecount && \ 289 (!(vp)->v_object || \ 290 !((vp)->v_object->ref_count || (vp)->v_object->resident_page_count))) 291 292#define VSHOULDBUSY(vp) \ 293 (((vp)->v_flag & (VFREE|VTBFREE)) && \ 294 ((vp)->v_holdcnt || (vp)->v_usecount)) 295 296#endif /* KERNEL */ 297 298 299/* 300 * Mods for extensibility. 301 */ 302 303/* 304 * Flags for vdesc_flags: 305 */ 306#define VDESC_MAX_VPS 16 307/* Low order 16 flag bits are reserved for willrele flags for vp arguments. */ 308#define VDESC_VP0_WILLRELE 0x0001 309#define VDESC_VP1_WILLRELE 0x0002 310#define VDESC_VP2_WILLRELE 0x0004 311#define VDESC_VP3_WILLRELE 0x0008 312#define VDESC_NOMAP_VPP 0x0100 313#define VDESC_VPP_WILLRELE 0x0200 314 315/* 316 * VDESC_NO_OFFSET is used to identify the end of the offset list 317 * and in places where no such field exists. 318 */ 319#define VDESC_NO_OFFSET -1 320 321/* 322 * This structure describes the vnode operation taking place. 323 */ 324struct vnodeop_desc { 325 int vdesc_offset; /* offset in vector--first for speed */ 326 char *vdesc_name; /* a readable name for debugging */ 327 int vdesc_flags; /* VDESC_* flags */ 328 329 /* 330 * These ops are used by bypass routines to map and locate arguments. 331 * Creds and procs are not needed in bypass routines, but sometimes 332 * they are useful to (for example) transport layers. 333 * Nameidata is useful because it has a cred in it. 334 */ 335 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */ 336 int vdesc_vpp_offset; /* return vpp location */ 337 int vdesc_cred_offset; /* cred location, if any */ 338 int vdesc_proc_offset; /* proc location, if any */ 339 int vdesc_componentname_offset; /* if any */ 340 /* 341 * Finally, we've got a list of private data (about each operation) 342 * for each transport layer. (Support to manage this list is not 343 * yet part of BSD.) 344 */ 345 caddr_t *vdesc_transports; 346}; 347 348#ifdef KERNEL 349/* 350 * A list of all the operation descs. 351 */ 352extern struct vnodeop_desc *vnodeop_descs[]; 353 354/* 355 * Interlock for scanning list of vnodes attached to a mountpoint 356 */ 357extern struct simplelock mntvnode_slock; 358 359/* 360 * This macro is very helpful in defining those offsets in the vdesc struct. 361 * 362 * This is stolen from X11R4. I ignored all the fancy stuff for 363 * Crays, so if you decide to port this to such a serious machine, 364 * you might want to consult Intrinsic.h's XtOffset{,Of,To}. 365 */ 366#define VOPARG_OFFSET(p_type,field) \ 367 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL))) 368#define VOPARG_OFFSETOF(s_type,field) \ 369 VOPARG_OFFSET(s_type*,field) 370#define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \ 371 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET))) 372 373 374/* 375 * This structure is used to configure the new vnodeops vector. 376 */ 377struct vnodeopv_entry_desc { 378 struct vnodeop_desc *opve_op; /* which operation this is */ 379 vop_t *opve_impl; /* code implementing this operation */ 380}; 381struct vnodeopv_desc { 382 /* ptr to the ptr to the vector where op should go */ 383 vop_t ***opv_desc_vector_p; 384 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */ 385}; 386 387/* 388 * A generic structure. 389 * This can be used by bypass routines to identify generic arguments. 390 */ 391struct vop_generic_args { 392 struct vnodeop_desc *a_desc; 393 /* other random data follows, presumably */ 394}; 395 396 397#ifdef DEBUG_VFS_LOCKS 398/* 399 * Macros to aid in tracing VFS locking problems. Not totally 400 * reliable since if the process sleeps between changing the lock 401 * state and checking it with the assert, some other process could 402 * change the state. They are good enough for debugging a single 403 * filesystem using a single-threaded test. I find that 'cvs co src' 404 * is a pretty good test. 405 */ 406 407/* 408 * [dfr] Kludge until I get around to fixing all the vfs locking. 409 */ 410#define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \ 411 || (vp)->v_tag == VT_MFS \ 412 || (vp)->v_tag == VT_NFS \ 413 || (vp)->v_tag == VT_LFS \ 414 || (vp)->v_tag == VT_ISOFS \ 415 || (vp)->v_tag == VT_MSDOSFS \ 416 || (vp)->v_tag == VT_DEVFS) 417 418#define ASSERT_VOP_LOCKED(vp, str) \ 419 if ((vp) && IS_LOCKING_VFS(vp) && !VOP_ISLOCKED(vp)) { \ 420 panic("%s: %x is not locked but should be", str, vp); \ 421 } 422 423#define ASSERT_VOP_UNLOCKED(vp, str) \ 424 if ((vp) && IS_LOCKING_VFS(vp) && VOP_ISLOCKED(vp)) { \ 425 panic("%s: %x is locked but shouldn't be", str, vp); \ 426 } 427 428#else 429 430#define ASSERT_VOP_LOCKED(vp, str) 431#define ASSERT_VOP_UNLOCKED(vp, str) 432 433#endif 434 435/* 436 * VOCALL calls an op given an ops vector. We break it out because BSD's 437 * vclean changes the ops vector and then wants to call ops with the old 438 * vector. 439 */ 440#define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP)) 441 442/* 443 * This call works for vnodes in the kernel. 444 */ 445#define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP)) 446#define VDESC(OP) (& __CONCAT(OP,_desc)) 447#define VOFFSET(OP) (VDESC(OP)->vdesc_offset) 448 449/* 450 * Finally, include the default set of vnode operations. 451 */ 452#include "vnode_if.h" 453 454/* 455 * Public vnode manipulation functions. 456 */ 457struct componentname; 458struct file; 459struct mount; 460struct nameidata; 461struct ostat; 462struct proc; 463struct stat; 464struct nstat; 465struct ucred; 466struct uio; 467struct vattr; 468struct vnode; 469struct vop_bwrite_args; 470 471extern int (*lease_check_hook) __P((struct vop_lease_args *)); 472 473int bdevvp __P((dev_t dev, struct vnode **vpp)); 474/* cache_* may belong in namei.h. */ 475void cache_enter __P((struct vnode *dvp, struct vnode *vp, 476 struct componentname *cnp)); 477int cache_lookup __P((struct vnode *dvp, struct vnode **vpp, 478 struct componentname *cnp)); 479void cache_purge __P((struct vnode *vp)); 480void cache_purgevfs __P((struct mount *mp)); 481void cvtstat __P((struct stat *st, struct ostat *ost)); 482void cvtnstat __P((struct stat *sb, struct nstat *nsb)); 483int getnewvnode __P((enum vtagtype tag, 484 struct mount *mp, vop_t **vops, struct vnode **vpp)); 485int lease_check __P((struct vop_lease_args *ap)); 486void vattr_null __P((struct vattr *vap)); 487int vcount __P((struct vnode *vp)); 488void vdrop __P((struct vnode *)); 489int vfinddev __P((dev_t dev, enum vtype type, struct vnode **vpp)); 490void vfs_opv_init __P((struct vnodeopv_desc *opv)); 491void vfs_mod_opv_init __P((void *handle)); 492int vflush __P((struct mount *mp, struct vnode *skipvp, int flags)); 493int vget __P((struct vnode *vp, int lockflag, struct proc *p)); 494void vgone __P((struct vnode *vp)); 495void vhold __P((struct vnode *)); 496int vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred, 497 498 struct proc *p, int slpflag, int slptimeo)); 499int vtruncbuf __P((struct vnode *vp, struct ucred *cred, struct proc *p, 500 off_t length, int blksize)); 501void vprint __P((char *label, struct vnode *vp)); 502int vrecycle __P((struct vnode *vp, struct simplelock *inter_lkp, 503 struct proc *p)); 504int vn_close __P((struct vnode *vp, 505 int flags, struct ucred *cred, struct proc *p)); 506int vn_lock __P((struct vnode *vp, int flags, struct proc *p)); 507int vn_open __P((struct nameidata *ndp, int fmode, int cmode)); 508void vn_pollevent __P((struct vnode *vp, int events)); 509void vn_pollgone __P((struct vnode *vp)); 510int vn_pollrecord __P((struct vnode *vp, struct proc *p, int events)); 511int vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base, 512 int len, off_t offset, enum uio_seg segflg, int ioflg, 513 struct ucred *cred, int *aresid, struct proc *p)); 514int vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p)); 515void vn_syncer_add_to_worklist __P((struct vnode *vp, int delay)); 516int vfs_cache_lookup __P((struct vop_lookup_args *ap)); 517int vfs_object_create __P((struct vnode *vp, struct proc *p, 518 struct ucred *cred, int waslocked)); 519int vn_writechk __P((struct vnode *vp)); 520int vop_stdbwrite __P((struct vop_bwrite_args *ap)); 521int vop_stdislocked __P((struct vop_islocked_args *)); 522int vop_stdlock __P((struct vop_lock_args *)); 523int vop_stdunlock __P((struct vop_unlock_args *)); 524int vop_noislocked __P((struct vop_islocked_args *)); 525int vop_nolock __P((struct vop_lock_args *)); 526int vop_nopoll __P((struct vop_poll_args *)); 527int vop_nounlock __P((struct vop_unlock_args *)); 528int vop_stdpathconf __P((struct vop_pathconf_args *)); 529int vop_stdpoll __P((struct vop_poll_args *)); 530int vop_revoke __P((struct vop_revoke_args *)); 531int vop_sharedlock __P((struct vop_lock_args *)); 532int vop_eopnotsupp __P((struct vop_generic_args *ap)); 533int vop_ebadf __P((struct vop_generic_args *ap)); 534int vop_einval __P((struct vop_generic_args *ap)); 535int vop_enotty __P((struct vop_generic_args *ap)); 536int vop_defaultop __P((struct vop_generic_args *ap)); 537int vop_null __P((struct vop_generic_args *ap)); 538 539struct vnode * 540 checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp)); 541void vput __P((struct vnode *vp)); 542void vrele __P((struct vnode *vp)); 543void vref __P((struct vnode *vp)); 544void vbusy __P((struct vnode *vp)); 545 546extern vop_t **default_vnodeop_p; 547 548extern TAILQ_HEAD(tobefreelist, vnode) 549 vnode_tobefree_list; /* vnode free list */ 550 551#endif /* KERNEL */ 552 553#endif /* !_SYS_VNODE_H_ */ 554