/*
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)vnode.h     8.7 (Berkeley) 2/4/94
 * $FreeBSD: src/sys/sys/vnode.h,v 1.111.2.19 2002/12/29 18:19:53 dillon Exp $
 */

#ifndef _SYS_VNODE_H_
#define _SYS_VNODE_H_

#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)

#ifndef _SYS_QUEUE_H_
#include <sys/queue.h>
#endif
#ifndef _SYS_LOCK_H_
#include <sys/lock.h>
#endif
#ifndef _SYS_EVENT_H_
#include <sys/event.h>
#endif
#ifndef _SYS_BIOTRACK_H_
#include <sys/biotrack.h>
#endif
#ifndef _SYS__UIO_H_
#include <sys/_uio.h>
#endif
#ifndef _SYS_ACL_H_
#include <sys/acl.h>
#endif
#ifndef _SYS_NAMECACHE_H_
#include <sys/namecache.h>
#endif
#ifndef _SYS_THREAD_H_
#include <sys/thread.h>
#endif
#ifndef _SYS_VFSOPS_H_
#include <sys/vfsops.h>
#endif
#ifndef _SYS_VFSCACHE_H_
#include <sys/vfscache.h>
#endif
#ifndef _SYS_TREE_H_
#include <sys/tree.h>
#endif
#ifndef _SYS_SYSLINK_RPC_H_
#include <sys/syslink_rpc.h>
#endif
#ifndef _MACHINE_LOCK_H_
#include <machine/lock.h>
#endif

/*
 * The vnode is the focus of all file activity in UNIX.  There is a
 * unique vnode allocated for each active file, each current directory,
 * each mounted-on file, text file, and the root.
 */

/*
 * Each underlying filesystem allocates its own private area and hangs
 * it from v_data.  If non-null, this area is freed in getnewvnode().
 */
TAILQ_HEAD(buflists, buf);

/*
 * Struct for mount options to printable formats.
 */
struct mountctl_opt {
        int             o_opt;
        const char      *o_name;
};

/*
 * The vnode infrastructure is being reorganized.  Most reference-related
 * fields are locked by the BGL, and most file I/O related operations and
 * vnode teardown functions are locked by the vnode lock.
 *
 * File read operations require a shared lock, file write operations require
 * an exclusive lock.  Most directory operations (read or write) currently
 * require an exclusive lock due to the side effects stored in the directory
 * inode (which we intend to fix).
 *
 * File reads and writes are further protected by a range lock.  The intention
 * is to be able to break I/O operations down into more easily managed pieces
 * so vm_page arrays can be passed through rather then UIOs.  This work will
 * occur in multiple stages.  The range locks will also eventually be used to
 * deal with clustered cache coherency issues and, more immediately, to
 * protect operations associated with the kernel-managed journaling module.
 *
 * v_lastwrite_ts is set along with VLASTWRITETS when a file is mmap()'d
 * SHARED+RW.  VM page flushes, which can be delayed substantially from when
 * the page was actually modified, will use the v_lastwrite_ts if available.
 *
 * NOTE: Certain fields within the vnode structure requires v_token to be
 *       held.  The vnode's normal lock need not be held when accessing
 *       these fields as long as the vnode is deterministically referenced
 *       (i.e. can't be ripped out from under the caller).  This is typical
 *       for code paths based on descriptors or file pointers, but not for
 *       backdoor code paths that come in via the buffer cache.
 *
 *      v_rbclean_tree
 *      v_rbdirty_tree
 *      v_rbhash_tree
 *      v_pollinfo
 *
 * NOTE: The vnode operations vector, v_ops, is a double-indirect that
 *       typically points to &v_mount->mnt_vn_use_ops.  We use a double
 *       pointer because mnt_vn_use_ops may change dynamically when e.g.
 *       journaling is turned on or off.
 *
 * NOTE: v_filesize is currently only applicable when a VM object is
 *       associated with the vnode.  Otherwise it will be set to NOOFFSET.
 *
 * NOTE: The following fields require a spin or token lock.  Note that
 *       additional subsystems may use v_token or v_spin for other
 *       purposes, e.g. vfs/fifofs/fifo_vnops.c
 *
 *       v_namecache    v_spin
 *       v_rb*          v_token
 */
RB_HEAD(buf_rb_tree, buf);
RB_HEAD(buf_rb_hash, buf);

struct vnode {
        struct lock     v_lock;                 /* file/dir ops lock */
        struct lwkt_token v_token;              /* (see above) */
        struct spinlock v_spin;
        int     v_pbuf_count;                   /* (device nodes only) */
        int     v_writecount;
        struct bio_track v_track_read;          /* track I/O's in progress */
        struct bio_track v_track_write;         /* track I/O's in progress */
        int     v_opencount;                    /* number of explicit opens */
        int     v_flag;                         /* vnode flags (see below) */
        struct mount *v_mount;                  /* ptr to vfs we are in */
        struct vop_ops **v_ops;                 /* vnode operations vector */
        TAILQ_ENTRY(vnode) v_list;              /* vnode act/inact/cache/free */
        TAILQ_ENTRY(vnode) v_nmntvnodes;        /* vnodes for mount point */
        LIST_ENTRY(vnode) v_synclist;           /* vnodes with dirty buffers */
        struct buf_rb_tree v_rbclean_tree;      /* RB tree of clean bufs */
        struct buf_rb_tree v_rbdirty_tree;      /* RB tree of dirty bufs */
        struct buf_rb_hash v_rbhash_tree;       /* RB tree general lookup */
        enum vtype      v_type;                 /* vnode type */
        int16_t         v_act;                  /* use heuristic */
        int16_t         v_state;                /* active/free/cached */
        union {
                struct socket   *vu_socket;     /* unix ipc (VSOCK) */
                struct {
                        int     vu_umajor;      /* device number for attach */
                        int     vu_uminor;
                        struct cdev     *vu_cdevinfo; /* device (VCHR, VBLK) */
                        SLIST_ENTRY(vnode) vu_cdevnext;
                } vu_cdev;
                struct fifoinfo *vu_fifoinfo;   /* fifo (VFIFO) */
        } v_un;
        off_t   v_filesize;                     /* file EOF or NOOFFSET */
        off_t   v_lazyw;                        /* lazy write iterator */
        struct vm_object *v_object;             /* Place to store VM object */
        enum    vtagtype v_tag;                 /* type of underlying data */
        void    *v_data;                        /* private data for fs */
        struct namecache_list v_namecache;      /* (S) associated nc entries */
        int     v_namecache_count;              /* (S) count of entries */
        int     v_auxrefs;                      /* vhold/vdrop refs */
        int     v_refcnt;                       /* vget/vput refs */
        struct  {
                struct  kqinfo vpi_kqinfo;      /* identity of poller(s) */
        } v_pollinfo;
        struct vmresident *v_resident;          /* optional vmresident */
        struct mount *v_pfsmp;                  /* real mp for pfs/nullfs mt */
        struct timespec v_lastwrite_ts;         /* async mmap flush ts */
};
#define v_socket        v_un.vu_socket
#define v_umajor        v_un.vu_cdev.vu_umajor
#define v_uminor        v_un.vu_cdev.vu_uminor
#define v_rdev          v_un.vu_cdev.vu_cdevinfo
#define v_cdevnext      v_un.vu_cdev.vu_cdevnext
#define v_fifoinfo      v_un.vu_fifoinfo

/*
 * Vnode flags.
 */
#define VROOT           0x00000001      /* root of its file system */
#define VTEXT           0x00000002      /* vnode is a pure text prototype */
#define VSYSTEM         0x00000004      /* vnode being used by kernel */
#define VISTTY          0x00000008      /* vnode represents a tty */
#define VCTTYISOPEN     0x00000010      /* controlling terminal tty is open */
#define VCKPT           0x00000020      /* checkpoint-restored vnode */
#define VKVABIO         0x00000040      /* strategy func support KVABIO API */
#define VMAYHAVELOCKS   0x00000080      /* maybe posix or flock locks on vp */
#define VPFSROOT        0x00000100      /* may be a pseudo filesystem root */
/* open for business    0x00000200 */
#define VAGE0           0x00000400      /* Age count for recycling - 2 bits */
#define VAGE1           0x00000800      /* Age count for recycling - 2 bits */
/* open for business    0x00001000 */
#define VOBJBUF         0x00002000      /* Allocate buffers in VM object */
#define VINACTIVE       0x00004000      /* ran VOP_INACTIVE */
/* open for business    0x00008000 */
/* open for business    0x00010000 */
/* open for business    0x00020000 */
#define VRECLAIMED      0x00040000      /* This vnode has been destroyed */
#define VLASTWRITETS    0x00080000      /* VLASTWRITETS updated */
#define VNOTSEEKABLE    0x00100000      /* rd/wr ignores file offset */
#define VONWORKLST      0x00200000      /* On syncer work-list */
#define VISDIRTY        0x00400000      /* inode dirty from VFS */
#define VOBJDIRTY       0x00800000      /* object might be dirty */
#define VSWAPCACHE      0x01000000      /* enable swapcache */
/* open for business    0x02000000 */
/* open for business    0x04000000 */

/*
 * v_state flags (v_state is interlocked by v_spin and vfs_spin)
 */
#define VS_CACHED       0
#define VS_ACTIVE       1
#define VS_INACTIVE     2
#define VS_DYING        3

/*
 * v_refcnt uses bit 30 to flag that 1->0 transitions require finalization
 * (actual deactivation) and bit 31 to indicate that deactivation is in
 * progress.
 *
 * The VREFCNT() macro returns a negative number if the vnode is undergoing
 * termination (value should not be interpreted beyond being negative),
 * zero if it is cached and has no references, or a positive number
 * indicating the number of refs.
 */
#define VREF_TERMINATE  0x80000000      /* termination in progress */
#define VREF_FINALIZE   0x40000000      /* deactivate on last vrele */
#define VREF_MASK       0xBFFFFFFF      /* includes VREF_TERMINATE */

#define VREFCNT(vp)     ((int)((vp)->v_refcnt & VREF_MASK))

/*
 * vmntvnodescan() flags
 */
#define VMSC_GETVP      0x01
#define VMSC_GETVX      0x02
#define VMSC_NOWAIT     0x10
#define VMSC_ONEPASS    0x20

/*
 * Flags for ioflag. (high 16 bits used to ask for read-ahead and
 * help with write clustering)
 */
#define IO_UNIT         0x0001          /* do I/O as atomic unit */
#define IO_APPEND       0x0002          /* append write to end */
#define IO_SYNC         0x0004          /* do I/O synchronously */
#define IO_NODELOCKED   0x0008          /* underlying node already locked */
#define IO_NDELAY       0x0010          /* FNDELAY flag set in file table */
#define IO_VMIO         0x0020          /* data already in VMIO space */
#define IO_INVAL        0x0040          /* invalidate after I/O */
#define IO_ASYNC        0x0080          /* bawrite rather then bdwrite */
#define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
#define IO_RECURSE      0x0200          /* possibly device-recursive (vn) */
#define IO_CORE         0x0400          /* I/O is part of core dump */
#define IO_NRDELAY      0x0800          /* do not block on disk reads */

#define IO_SEQMAX       0x7F            /* seq heuristic max value */
#define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */

/*
 * Modes.  Note that these V-modes must match file S_I*USR, SUID, SGID,
 * and SVTX flag bits.
 */
#define VSUID   04000           /* set user id on execution */
#define VSGID   02000           /* set group id on execution */
#define VSVTX   01000           /* save swapped text even after use */
#define VREAD   00400           /* read, write, execute permissions */
#define VWRITE  00200
#define VEXEC   00100

/*
 * Token indicating no attribute value yet assigned.
 */
#define VNOVAL  (-1)

/*
 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
 */
#define VLKTIMEOUT     (hz / 20 + 1)

TAILQ_HEAD(freelst, vnode);

struct vnode_index {
        struct freelst  active_list;
        struct vnode    active_rover;
        struct freelst  inactive_list;
        struct spinlock spin;
        int     deac_rover;
        int     free_rover;
} __cachealign;

#ifdef _KERNEL

/*
 * Convert between vnode types and inode formats (since POSIX.1
 * defines mode word of stat structure in terms of inode formats).
 */
extern  enum vtype      iftovt_tab[];
extern  int             vttoif_tab[];
#define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
#define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
#define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))

/*
 * Flags to various vnode functions.
 */
#define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
#define FORCECLOSE      0x0002          /* vflush: force file closure */
#define WRITECLOSE      0x0004          /* vflush: only close writable files */
#define DOCLOSE         0x0008          /* vclean: close active files */
#define V_SAVE          0x0001          /* vinvalbuf: sync file first */

#ifdef DIAGNOSTIC
#define VATTR_NULL(vap) vattr_null(vap)
#else
#define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
#endif /* DIAGNOSTIC */

#define NULLVP  ((struct vnode *)NULL)

#define VNODEOP_SET(f) \
        SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_nadd_vnodeops_sysinit, &f); \
        SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND,vfs_nrm_vnodeops_sysinit, &f)

/*
 * nvextendbuf() flags
 */
#define NVEXTF_TRIVIAL  0x0001
#define NVEXTF_BUWRITE  0x0002

/*
 * Global vnode data.
 */
struct objcache;

extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
extern  struct nchandle rootnch;        /* root (i.e. "/") namecache */
extern  int maxvnodes;                  /* nominal maximum number of vnodes */
extern  time_t syncdelay;               /* max time to delay syncing data */
extern  time_t filedelay;               /* time to delay syncing files */
extern  time_t dirdelay;                /* time to delay syncing directories */
extern  time_t metadelay;               /* time to delay syncing metadata */
extern  struct objcache *namei_oc;
extern  int prtactive;                  /* nonzero to call vprint() */
extern  struct vattr va_null;           /* predefined null vattr structure */
extern  int numvnodes;
extern  int inactivevnodes;
extern  int activevnodes;

/*
 * This macro is very helpful in defining those offsets in the vdesc struct.
 *
 * This is stolen from X11R4.  I ignored all the fancy stuff for
 * Crays, so if you decide to port this to such a serious machine,
 * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
 */
#define VOPARG_OFFSET(p_type,field) \
        ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
#define VOPARG_OFFSETOF(s_type,field) \
        VOPARG_OFFSET(s_type*,field)
#define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
        ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))

typedef int (*vnodeopv_entry_t)(struct vop_generic_args *);

/*
 * VOCALL calls an op given an ops vector.  We break it out because BSD's
 * vclean changes the ops vector and then wants to call ops with the old
 * vector.
 */

typedef int (*vocall_func_t)(struct vop_generic_args *);

/*
 * This call executes the vops vector for the offset stored in the ap's
 * descriptor of the passed vops rather then the one related to the
 * ap's vop_ops structure.  It is used to chain VOPS calls on behalf of
 * filesystems from a VFS's context ONLY (that is, from a VFS's own vops
 * vector function).
 */
#define VOCALL(vops, ap)                \
        (*(vocall_func_t *)((char *)(vops)+((ap)->a_desc->sd_offset)))(ap)

#define VDESC(OP) (& __CONCAT(OP,_desc))

/*
 * Public vnode manipulation functions.
 */
struct file;
struct mount;
struct nlookupdata;
struct proc;
struct thread;
struct stat;
struct ucred;
struct uio;
struct vattr;
struct vnode;
struct syncer_ctx;
struct vfsops;

struct vnode *getsynthvnode(const char *devname);
void    addaliasu (struct vnode *vp, int x, int y);
int     v_associate_rdev(struct vnode *vp, cdev_t dev);
void    v_release_rdev(struct vnode *vp);
int     bdevvp (cdev_t dev, struct vnode **vpp);
struct vnode *allocvnode(int lktimeout, int lkflags);
void    allocvnode_gc(void);
int     freesomevnodes(int count);
int     getnewvnode (enum vtagtype tag, struct mount *mp, 
                    struct vnode **vpp, int timo, int lkflags);
int     getspecialvnode (enum vtagtype tag, struct mount *mp, 
                    struct vop_ops **ops, struct vnode **vpp, int timo, 
                    int lkflags);
void    speedup_syncer (struct mount *mp);
void    trigger_syncer (struct mount *mp);
void    trigger_syncer_start (struct mount *mp);
void    trigger_syncer_stop (struct mount *mp);
int     vaccess(enum vtype, mode_t, uid_t, gid_t, mode_t, struct ucred *);
void    vattr_null (struct vattr *vap);
int     vcount (struct vnode *vp);
void    vfs_nadd_vnodeops_sysinit (void *);
void    vfs_nrm_vnodeops_sysinit (void *);
void    vfs_add_vnodeops(struct mount *, struct vop_ops *, struct vop_ops **);
void    vfs_rm_vnodeops(struct mount *, struct vop_ops *, struct vop_ops **);
int     vflush (struct mount *mp, int rootrefs, int flags);

int     vmntvnodescan(struct mount *mp, int flags,
            int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
            int (*slowfunc)(struct mount *mp, struct vnode *vp, void *data),
            void *data);
int     vsyncscan(struct mount *mp, int flags,
            int (*slowfunc)(struct mount *mp, struct vnode *vp, void *data),
            void *data);
void    vclrisdirty(struct vnode *vp);
void    vclrobjdirty(struct vnode *vp);
void    vsetisdirty(struct vnode *vp);
void    vsetobjdirty(struct vnode *vp);

void    insmntque(struct vnode *vp, struct mount *mp);

void    vclean_unlocked (struct vnode *vp);
void    vgone_vxlocked (struct vnode *vp);
int     vrevoke (struct vnode *vp, struct ucred *cred);
int     vinvalbuf (struct vnode *vp, int save, int slpflag, int slptimeo);
int     vtruncbuf (struct vnode *vp, off_t length, int blksize);
void    vnode_pager_setsize (struct vnode *, vm_ooffset_t);
int     nvtruncbuf (struct vnode *vp, off_t length, int blksize, int boff,
                int flags);
int     nvextendbuf(struct vnode *vp, off_t olength, off_t nlength,
                int oblksize, int nblksize,
                int oboff, int nboff, int flags);
void    nvnode_pager_setsize (struct vnode *vp, off_t length,
                int blksize, int boff);
int     vfsync(struct vnode *vp, int waitfor, int passes,
                int (*checkdef)(struct buf *),
                int (*waitoutput)(struct vnode *, struct thread *));
int     vinitvmio(struct vnode *vp, off_t filesize, int blksize, int boff);
void    vprint (char *label, struct vnode *vp);
int     vrecycle (struct vnode *vp);
int     vmaxiosize (struct vnode *vp);
void    vn_strategy(struct vnode *vp, struct bio *bio);
int     vn_cache_strategy(struct vnode *vp, struct bio *bio);
int     vn_close (struct vnode *vp, int flags, struct file *fp);
void    vn_gone (struct vnode *vp);
int     vn_isdisk (struct vnode *vp, int *errp);
int     vn_islocked (struct vnode *vp);
int     vn_islocked_unlock (struct vnode *vp);
void    vn_islocked_relock (struct vnode *vp, int vpls);
int     vn_lock (struct vnode *vp, int flags);
void    vn_unlock (struct vnode *vp);
int     vn_relock (struct vnode *vp, int flags);

/*#define DEBUG_VN_UNLOCK*/
#ifdef DEBUG_VN_UNLOCK
void    debug_vn_unlock (struct vnode *vp,
                const char *filename, int line);
#define vn_unlock(vp)           debug_vn_unlock(vp, __FILE__, __LINE__)
#endif

int     vn_get_namelen(struct vnode *, int *);
void    vn_setspecops (struct file *fp);
int     vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf, int guess);
int     vn_open (struct nlookupdata *ndp, struct file **fpp, int fmode, int cmode);
int     vn_opendisk (const char *devname, int fmode, struct vnode **vpp);
int     vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
            int len, off_t offset, enum uio_seg segflg, int ioflg,
            struct ucred *cred, int *aresid);
int     vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
            int len, off_t offset, enum uio_seg segflg, int ioflg,
            struct ucred *cred, int *aresid);
int     vn_stat (struct vnode *vp, struct stat *sb, struct ucred *cred);
cdev_t  vn_todev (struct vnode *vp);
void    vfs_timestamp (struct timespec *);
size_t  vfs_flagstostr(int flags, const struct mountctl_opt *optp, char *buf, size_t len, int *errorp);
void    vn_mark_atime(struct vnode *vp, struct thread *td);
int     vfs_inodehashsize(void);
int     vn_writechk (struct vnode *vp);
int     ncp_writechk(struct nchandle *nch);
int     vop_stdopen (struct vop_open_args *ap);
int     vop_stdclose (struct vop_close_args *ap);
int     vop_stdgetattr_lite (struct vop_getattr_lite_args *ap);
int     vop_stdmountctl(struct vop_mountctl_args *ap);
int     vop_stdgetpages(struct vop_getpages_args *ap);
int     vop_stdputpages(struct vop_putpages_args *ap);
int     vop_stdmarkatime(struct vop_markatime_args *ap);
int     vop_stdallocate(struct vop_allocate_args *ap);
int     vop_stdnoread(struct vop_read_args *ap);
int     vop_stdnowrite(struct vop_write_args *ap);
int     vop_stdpathconf (struct vop_pathconf_args *ap);
int     vop_stdfdatasync(struct vop_fdatasync_args *ap);
int     vop_stdioctl(struct vop_ioctl_args *);
int     vop_eopnotsupp (struct vop_generic_args *ap);
int     vop_ebadf (struct vop_generic_args *ap);
int     vop_einval (struct vop_generic_args *ap);
int     vop_enotty (struct vop_generic_args *ap);
int     vop_defaultop (struct vop_generic_args *ap);
int     vop_null (struct vop_generic_args *ap);
int     vop_write_dirent(int *, struct uio *, ino_t, uint8_t, uint16_t,
                         const char *);

int     vop_compat_nresolve(struct vop_nresolve_args *ap);
int     vop_compat_nlookupdotdot(struct vop_nlookupdotdot_args *ap);
int     vop_compat_ncreate(struct vop_ncreate_args *ap);
int     vop_compat_nmkdir(struct vop_nmkdir_args *ap);
int     vop_compat_nmknod(struct vop_nmknod_args *ap);
int     vop_compat_nlink(struct vop_nlink_args *ap);
int     vop_compat_nsymlink(struct vop_nsymlink_args *ap);
int     vop_compat_nwhiteout(struct vop_nwhiteout_args *ap);
int     vop_compat_nremove(struct vop_nremove_args *ap);
int     vop_compat_nrmdir(struct vop_nrmdir_args *ap);
int     vop_compat_nrename(struct vop_nrename_args *ap);

void    vx_downgrade (struct vnode *vp);
void    vx_lock (struct vnode *vp);
void    vx_unlock (struct vnode *vp);
void    vx_get (struct vnode *vp);
int     vx_get_nonblock (struct vnode *vp);
void    vx_put (struct vnode *vp);
int     vget (struct vnode *vp, int lockflag);
void    vput (struct vnode *vp);
void    vhold (struct vnode *);
void    vdrop (struct vnode *);
void    vref (struct vnode *vp);
void    vref_special (struct vnode *vp);
void    vrele (struct vnode *vp);
void    vsetflags (struct vnode *vp, int flags);
void    vclrflags (struct vnode *vp, int flags);
void    vfinalize (struct vnode *vp);

/*#define DEBUG_VPUT*/
#ifdef DEBUG_VPUT
void    debug_vput (struct vnode *vp, const char *filename, int line);
#define vput(vp)                debug_vput(vp, __FILE__, __LINE__)
#endif

void    vfs_subr_init(void);
void    vfs_mount_init(void);
void    vfs_lock_init(void);
void    mount_init(struct mount *mp, struct vfsops *ops);
void    synchronizevnodecount(void);
int     countcachedvnodes(void);
int     countcachedandinactivevnodes(void);

void    vn_syncer_add(struct vnode *, int);
void    vn_syncer_remove(struct vnode *, int);
void    vn_syncer_thr_create(struct mount *);
void    vn_syncer_thr_stop(struct mount *);
void    vn_syncer_one(struct mount *);
long    vn_syncer_count(struct mount *);

int     vn_bmap_seekhole_locked(struct vnode *vp, u_long cmd, off_t *off,
            struct ucred *cred);
int     vn_bmap_seekhole(struct vnode *vp, u_long cmd, off_t *off,
            struct ucred *cred);

u_quad_t init_va_filerev(void);

extern  struct vop_ops default_vnode_vops;
extern  struct vop_ops dead_vnode_vops;

extern  struct vop_ops *default_vnode_vops_p;
extern  struct vop_ops *dead_vnode_vops_p;

#endif  /* _KERNEL */

#endif  /* _KERNEL || _KERNEL_STRUCTURES */
#endif  /* !_SYS_VNODE_H_ */