The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/vnode.h

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    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  * $FreeBSD$
   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  */
   55 enum 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  */
   62 enum 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, VT_NTFS
   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  */
   72 TAILQ_HEAD(buflists, buf);
   73 
   74 typedef int     vop_t __P((void *));
   75 struct 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  */
   85 struct 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(cdst, namecache) v_cache_dst;        /* Cache entries to us */
  120         int     v_cache_dst_count;                      /* number of cache entries pointing to us */
  121         struct  vnode *v_dd;                    /* .. vnode */
  122         u_long  v_ddid;                         /* .. capability identifier */
  123         struct  {
  124                 struct  simplelock vpi_lock;    /* lock to protect below */
  125                 struct  selinfo vpi_selinfo;    /* identity of poller(s) */
  126                 short   vpi_events;             /* what they are looking for */
  127                 short   vpi_revents;            /* what has happened */
  128         } v_pollinfo;
  129 #ifdef  DEBUG_LOCKS
  130         const char *filename;                   /* Source file doing locking */
  131         int line;                               /* Line number doing locking */
  132 #endif
  133 };
  134 #define v_mountedhere   v_un.vu_mountedhere
  135 #define v_socket        v_un.vu_socket
  136 #define v_specinfo      v_un.vu_specinfo
  137 #define v_fifoinfo      v_un.vu_fifoinfo
  138 
  139 #define VN_POLLEVENT(vp, events)                                \
  140         do {                                                    \
  141                 if ((vp)->v_pollinfo.vpi_events & (events))     \
  142                         vn_pollevent((vp), (events));           \
  143         } while (0)
  144 
  145 /*
  146  * Vnode flags.
  147  */
  148 #define VROOT           0x00001 /* root of its file system */
  149 #define VTEXT           0x00002 /* vnode is a pure text prototype */
  150 #define VSYSTEM         0x00004 /* vnode being used by kernel */
  151 #define VISTTY          0x00008 /* vnode represents a tty */
  152 #define VXLOCK          0x00100 /* vnode is locked to change underlying type */
  153 #define VXWANT          0x00200 /* process is waiting for vnode */
  154 #define VBWAIT          0x00400 /* waiting for output to complete */
  155 #define VALIASED        0x00800 /* vnode has an alias */
  156 #define VDIROP          0x01000 /* LFS: vnode is involved in a directory op */
  157 #define VOBJBUF         0x02000 /* Allocate buffers in VM object */
  158 #define VNINACT         0x04000 /* LFS: skip ufs_inactive() in lfs_vunref */
  159 #define VAGE            0x08000 /* Insert vnode at head of free list */
  160 #define VOLOCK          0x10000 /* vnode is locked waiting for an object */
  161 #define VOWANT          0x20000 /* a process is waiting for VOLOCK */
  162 #define VDOOMED         0x40000 /* This vnode is being recycled */
  163 #define VFREE           0x80000 /* This vnode is on the freelist */
  164 #define VTBFREE         0x100000 /* This vnode is on the to-be-freelist */
  165 #define VONWORKLST      0x200000 /* On syncer work-list */
  166 #define VMOUNT          0x400000 /* Mount in progress */
  167 
  168 /*
  169  * Vnode attributes.  A field value of VNOVAL represents a field whose value
  170  * is unavailable (getattr) or which is not to be changed (setattr).
  171  */
  172 struct vattr {
  173         enum vtype      va_type;        /* vnode type (for create) */
  174         u_short         va_mode;        /* files access mode and type */
  175         short           va_nlink;       /* number of references to file */
  176         uid_t           va_uid;         /* owner user id */
  177         gid_t           va_gid;         /* owner group id */
  178         long            va_fsid;        /* file system id (dev for now) */
  179         long            va_fileid;      /* file id */
  180         u_quad_t        va_size;        /* file size in bytes */
  181         long            va_blocksize;   /* blocksize preferred for i/o */
  182         struct timespec va_atime;       /* time of last access */
  183         struct timespec va_mtime;       /* time of last modification */
  184         struct timespec va_ctime;       /* time file changed */
  185         u_long          va_gen;         /* generation number of file */
  186         u_long          va_flags;       /* flags defined for file */
  187         dev_t           va_rdev;        /* device the special file represents */
  188         u_quad_t        va_bytes;       /* bytes of disk space held by file */
  189         u_quad_t        va_filerev;     /* file modification number */
  190         u_int           va_vaflags;     /* operations flags, see below */
  191         long            va_spare;       /* remain quad aligned */
  192 };
  193 
  194 /*
  195  * Flags for va_vaflags.
  196  */
  197 #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
  198 #define VA_EXCLUSIVE    0x02            /* exclusive create request */
  199 
  200 /*
  201  * Flags for ioflag.
  202  */
  203 #define IO_UNIT         0x01            /* do I/O as atomic unit */
  204 #define IO_APPEND       0x02            /* append write to end */
  205 #define IO_SYNC         0x04            /* do I/O synchronously */
  206 #define IO_NODELOCKED   0x08            /* underlying node already locked */
  207 #define IO_NDELAY       0x10            /* FNDELAY flag set in file table */
  208 #define IO_VMIO         0x20            /* data already in VMIO space */
  209 #define IO_INVAL        0x40            /* invalidate after I/O */
  210 
  211 /*
  212  *  Modes.  Some values same as Ixxx entries from inode.h for now.
  213  */
  214 #define VSUID   04000           /* set user id on execution */
  215 #define VSGID   02000           /* set group id on execution */
  216 #define VSVTX   01000           /* save swapped text even after use */
  217 #define VREAD   00400           /* read, write, execute permissions */
  218 #define VWRITE  00200
  219 #define VEXEC   00100
  220 
  221 /*
  222  * Token indicating no attribute value yet assigned.
  223  */
  224 #define VNOVAL  (-1)
  225 
  226 #ifdef KERNEL
  227 
  228 #ifdef MALLOC_DECLARE
  229 MALLOC_DECLARE(M_VNODE);
  230 #endif
  231 
  232 /*
  233  * Convert between vnode types and inode formats (since POSIX.1
  234  * defines mode word of stat structure in terms of inode formats).
  235  */
  236 extern enum vtype       iftovt_tab[];
  237 extern int              vttoif_tab[];
  238 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
  239 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
  240 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
  241 
  242 /*
  243  * Flags to various vnode functions.
  244  */
  245 #define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
  246 #define FORCECLOSE      0x0002          /* vflush: force file closure */
  247 #define WRITECLOSE      0x0004          /* vflush: only close writable files */
  248 #define DOCLOSE         0x0008          /* vclean: close active files */
  249 #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
  250 #define REVOKEALL       0x0001          /* vop_revoke: revoke all aliases */
  251 
  252 #define VREF(vp)        vref(vp)
  253 
  254 
  255 #ifdef DIAGNOSTIC
  256 #define VATTR_NULL(vap) vattr_null(vap)
  257 #else
  258 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
  259 #endif /* DIAGNOSTIC */
  260 
  261 #define NULLVP  ((struct vnode *)NULL)
  262 
  263 #if defined(VFS_LKM) && !defined(KLD_MODULE)
  264 #define VNODEOP_SET(f) DATA_SET(MODVNOPS,f)
  265 #else
  266 #define VNODEOP_SET(f) \
  267         SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops, &f); \
  268         SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND, vfs_rm_vnodeops, &f);
  269 #endif
  270 
  271 /*
  272  * Global vnode data.
  273  */
  274 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
  275 extern  int desiredvnodes;              /* number of vnodes desired */
  276 extern  time_t syncdelay;               /* time to delay syncing vnodes */
  277 extern  int rushjob;            /* # of slots filesys_syncer should run ASAP */
  278 extern  struct vm_zone *namei_zone;
  279 extern  int prtactive;                  /* nonzero to call vprint() */
  280 extern  struct vattr va_null;           /* predefined null vattr structure */
  281 extern  int vfs_ioopt;
  282 
  283 /*
  284  * Macro/function to check for client cache inconsistency w.r.t. leasing.
  285  */
  286 #define LEASE_READ      0x1             /* Check lease for readers */
  287 #define LEASE_WRITE     0x2             /* Check lease for modifiers */
  288 
  289 
  290 extern void     (*lease_updatetime) __P((int deltat));
  291 
  292 #define VSHOULDFREE(vp) \
  293         (!((vp)->v_flag & (VFREE|VDOOMED)) && \
  294          !(vp)->v_holdcnt && !(vp)->v_usecount && \
  295          (!(vp)->v_object || \
  296           !((vp)->v_object->ref_count || (vp)->v_object->resident_page_count)))
  297 
  298 #define VSHOULDBUSY(vp) \
  299         (((vp)->v_flag & (VFREE|VTBFREE)) && \
  300          ((vp)->v_holdcnt || (vp)->v_usecount))
  301 
  302 #endif /* KERNEL */
  303 
  304 
  305 /*
  306  * Mods for extensibility.
  307  */
  308 
  309 /*
  310  * Flags for vdesc_flags:
  311  */
  312 #define VDESC_MAX_VPS           16
  313 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
  314 #define VDESC_VP0_WILLRELE      0x0001
  315 #define VDESC_VP1_WILLRELE      0x0002
  316 #define VDESC_VP2_WILLRELE      0x0004
  317 #define VDESC_VP3_WILLRELE      0x0008
  318 #define VDESC_NOMAP_VPP         0x0100
  319 #define VDESC_VPP_WILLRELE      0x0200
  320 
  321 /*
  322  * VDESC_NO_OFFSET is used to identify the end of the offset list
  323  * and in places where no such field exists.
  324  */
  325 #define VDESC_NO_OFFSET -1
  326 
  327 /*
  328  * This structure describes the vnode operation taking place.
  329  */
  330 struct vnodeop_desc {
  331         int     vdesc_offset;           /* offset in vector--first for speed */
  332         char    *vdesc_name;            /* a readable name for debugging */
  333         int     vdesc_flags;            /* VDESC_* flags */
  334 
  335         /*
  336          * These ops are used by bypass routines to map and locate arguments.
  337          * Creds and procs are not needed in bypass routines, but sometimes
  338          * they are useful to (for example) transport layers.
  339          * Nameidata is useful because it has a cred in it.
  340          */
  341         int     *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
  342         int     vdesc_vpp_offset;       /* return vpp location */
  343         int     vdesc_cred_offset;      /* cred location, if any */
  344         int     vdesc_proc_offset;      /* proc location, if any */
  345         int     vdesc_componentname_offset; /* if any */
  346         /*
  347          * Finally, we've got a list of private data (about each operation)
  348          * for each transport layer.  (Support to manage this list is not
  349          * yet part of BSD.)
  350          */
  351         caddr_t *vdesc_transports;
  352 };
  353 
  354 #ifdef KERNEL
  355 /*
  356  * A list of all the operation descs.
  357  */
  358 extern struct vnodeop_desc *vnodeop_descs[];
  359 
  360 /*
  361  * Interlock for scanning list of vnodes attached to a mountpoint
  362  */
  363 extern struct simplelock mntvnode_slock;
  364 
  365 /*
  366  * This macro is very helpful in defining those offsets in the vdesc struct.
  367  *
  368  * This is stolen from X11R4.  I ignored all the fancy stuff for
  369  * Crays, so if you decide to port this to such a serious machine,
  370  * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
  371  */
  372 #define VOPARG_OFFSET(p_type,field) \
  373         ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
  374 #define VOPARG_OFFSETOF(s_type,field) \
  375         VOPARG_OFFSET(s_type*,field)
  376 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
  377         ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
  378 
  379 
  380 /*
  381  * This structure is used to configure the new vnodeops vector.
  382  */
  383 struct vnodeopv_entry_desc {
  384         struct vnodeop_desc *opve_op;   /* which operation this is */
  385         vop_t *opve_impl;               /* code implementing this operation */
  386 };
  387 struct vnodeopv_desc {
  388                         /* ptr to the ptr to the vector where op should go */
  389         vop_t ***opv_desc_vector_p;
  390         struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
  391 };
  392 
  393 /*
  394  * A generic structure.
  395  * This can be used by bypass routines to identify generic arguments.
  396  */
  397 struct vop_generic_args {
  398         struct vnodeop_desc *a_desc;
  399         /* other random data follows, presumably */
  400 };
  401 
  402 
  403 #ifdef DEBUG_VFS_LOCKS
  404 /*
  405  * Macros to aid in tracing VFS locking problems.  Not totally
  406  * reliable since if the process sleeps between changing the lock
  407  * state and checking it with the assert, some other process could
  408  * change the state.  They are good enough for debugging a single
  409  * filesystem using a single-threaded test.  I find that 'cvs co src'
  410  * is a pretty good test.
  411  */
  412 
  413 /*
  414  * [dfr] Kludge until I get around to fixing all the vfs locking.
  415  */
  416 #define IS_LOCKING_VFS(vp)      ((vp)->v_tag == VT_UFS          \
  417                                  || (vp)->v_tag == VT_MFS       \
  418                                  || (vp)->v_tag == VT_NFS       \
  419                                  || (vp)->v_tag == VT_LFS       \
  420                                  || (vp)->v_tag == VT_ISOFS     \
  421                                  || (vp)->v_tag == VT_MSDOSFS   \
  422                                  || (vp)->v_tag == VT_DEVFS)
  423 
  424 #define ASSERT_VOP_LOCKED(vp, str)                              \
  425     if ((vp) && IS_LOCKING_VFS(vp) && !VOP_ISLOCKED(vp)) {      \
  426         panic("%s: %x is not locked but should be", str, vp);   \
  427     }
  428 
  429 #define ASSERT_VOP_UNLOCKED(vp, str)                            \
  430     if ((vp) && IS_LOCKING_VFS(vp) && VOP_ISLOCKED(vp)) {       \
  431         panic("%s: %x is locked but shouldn't be", str, vp);    \
  432     }
  433 
  434 #else
  435 
  436 #define ASSERT_VOP_LOCKED(vp, str)
  437 #define ASSERT_VOP_UNLOCKED(vp, str)
  438 
  439 #endif
  440 
  441 /*
  442  * VOCALL calls an op given an ops vector.  We break it out because BSD's
  443  * vclean changes the ops vector and then wants to call ops with the old
  444  * vector.
  445  */
  446 #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
  447 
  448 /*
  449  * This call works for vnodes in the kernel.
  450  */
  451 #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
  452 #define VDESC(OP) (& __CONCAT(OP,_desc))
  453 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
  454 
  455 /*
  456  * Finally, include the default set of vnode operations.
  457  */
  458 #include "vnode_if.h"
  459 
  460 /*
  461  * Public vnode manipulation functions.
  462  */
  463 struct componentname;
  464 struct file;
  465 struct mount;
  466 struct nameidata;
  467 struct ostat;
  468 struct proc;
  469 struct stat;
  470 struct nstat;
  471 struct ucred;
  472 struct uio;
  473 struct vattr;
  474 struct vnode;
  475 struct vop_bwrite_args;
  476 
  477 extern int      (*lease_check_hook) __P((struct vop_lease_args *));
  478 
  479 int     bdevvp __P((dev_t dev, struct vnode **vpp));
  480 /* cache_* may belong in namei.h. */
  481 void    cache_enter __P((struct vnode *dvp, struct vnode *vp,
  482             struct componentname *cnp));
  483 int     cache_lookup __P((struct vnode *dvp, struct vnode **vpp,
  484             struct componentname *cnp));
  485 void    cache_purge __P((struct vnode *vp));
  486 void    cache_purgevfs __P((struct mount *mp));
  487 void    cvtstat __P((struct stat *st, struct ostat *ost));
  488 void    cvtnstat __P((struct stat *sb, struct nstat *nsb));
  489 int     getnewvnode __P((enum vtagtype tag,
  490             struct mount *mp, vop_t **vops, struct vnode **vpp));
  491 int     lease_check __P((struct vop_lease_args *ap));
  492 void    vattr_null __P((struct vattr *vap));
  493 int     vcount __P((struct vnode *vp));
  494 void    vdrop __P((struct vnode *));
  495 int     vfinddev __P((dev_t dev, enum vtype type, struct vnode **vpp));
  496 void    vfs_add_vnodeops __P((void *));
  497 void    vfs_rm_vnodeops __P((void *));
  498 int     vflush __P((struct mount *mp, struct vnode *skipvp, int flags));
  499 int     vget __P((struct vnode *vp, int lockflag, struct proc *p));
  500 void    vgone __P((struct vnode *vp));
  501 void    vhold __P((struct vnode *));
  502 int     vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
  503 
  504             struct proc *p, int slpflag, int slptimeo));
  505 int     vtruncbuf __P((struct vnode *vp, struct ucred *cred, struct proc *p,
  506                 off_t length, int blksize));
  507 void    vprint __P((char *label, struct vnode *vp));
  508 int     vrecycle __P((struct vnode *vp, struct simplelock *inter_lkp,
  509             struct proc *p));
  510 int     vn_close __P((struct vnode *vp,
  511             int flags, struct ucred *cred, struct proc *p));
  512 int     vn_lock __P((struct vnode *vp, int flags, struct proc *p));
  513 #ifdef  DEBUG_LOCKS
  514 int     debug_vn_lock __P((struct vnode *vp, int flags, struct proc *p,
  515             const char *filename, int line));
  516 #define vn_lock(vp,flags,p) debug_vn_lock(vp,flags,p,__FILE__,__LINE__)
  517 #endif
  518 int     vn_open __P((struct nameidata *ndp, int fmode, int cmode));
  519 void    vn_pollevent __P((struct vnode *vp, int events));
  520 void    vn_pollgone __P((struct vnode *vp));
  521 int     vn_pollrecord __P((struct vnode *vp, struct proc *p, int events));
  522 int     vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
  523             int len, off_t offset, enum uio_seg segflg, int ioflg,
  524             struct ucred *cred, int *aresid, struct proc *p));
  525 int     vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p));
  526 void    vn_syncer_add_to_worklist __P((struct vnode *vp, int delay));
  527 int     vfs_cache_lookup __P((struct vop_lookup_args *ap));
  528 int     vfs_object_create __P((struct vnode *vp, struct proc *p,
  529                 struct ucred *cred));
  530 int     vn_writechk __P((struct vnode *vp));
  531 int     vop_stdbwrite __P((struct vop_bwrite_args *ap));
  532 int     vop_stdislocked __P((struct vop_islocked_args *));
  533 int     vop_stdlock __P((struct vop_lock_args *));
  534 int     vop_stdunlock __P((struct vop_unlock_args *));
  535 int     vop_noislocked __P((struct vop_islocked_args *));
  536 int     vop_nolock __P((struct vop_lock_args *));
  537 int     vop_nopoll __P((struct vop_poll_args *));
  538 int     vop_nounlock __P((struct vop_unlock_args *));
  539 int     vop_stdpathconf __P((struct vop_pathconf_args *));
  540 int     vop_stdpoll __P((struct vop_poll_args *));
  541 int     vop_revoke __P((struct vop_revoke_args *));
  542 int     vop_sharedlock __P((struct vop_lock_args *));
  543 int     vop_eopnotsupp __P((struct vop_generic_args *ap));
  544 int     vop_ebadf __P((struct vop_generic_args *ap));
  545 int     vop_einval __P((struct vop_generic_args *ap));
  546 int     vop_enotty __P((struct vop_generic_args *ap));
  547 int     vop_defaultop __P((struct vop_generic_args *ap));
  548 int     vop_null __P((struct vop_generic_args *ap));
  549 int     vop_panic __P((struct vop_generic_args *ap));
  550 
  551 struct vnode *
  552         checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
  553 void    vput __P((struct vnode *vp));
  554 void    vrele __P((struct vnode *vp));
  555 void    vref __P((struct vnode *vp));
  556 void    vbusy __P((struct vnode *vp));
  557 
  558 extern  vop_t   **default_vnodeop_p;
  559 
  560 extern TAILQ_HEAD(tobefreelist, vnode)
  561         vnode_tobefree_list;    /* vnode free list */
  562 
  563 #endif /* KERNEL */
  564 
  565 #endif /* !_SYS_VNODE_H_ */

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