FreeBSD/Linux Kernel Cross Reference
sys/sys/vnode.h

     /*      $NetBSD: vnode.h,v 1.304 2022/10/26 23:40:30 riastradh Exp $    */
     
     /*-
      * Copyright (c) 2008, 2020 The NetBSD Foundation, Inc.
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * 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     8.17 (Berkeley) 5/20/95
     */
    
    #ifndef _SYS_VNODE_H_
    #define _SYS_VNODE_H_
    
    #include <sys/event.h>
    #include <sys/queue.h>
    #include <sys/condvar.h>
    #include <sys/rwlock.h>
    #include <sys/mutex.h>
    #include <sys/time.h>
    #include <sys/acl.h>
    
    /* XXX: clean up includes later */
    #include <uvm/uvm_param.h>      /* XXX */
    #if defined(_KERNEL) || defined(_KMEMUSER)
    #include <uvm/uvm_pglist.h>     /* XXX */
    #include <uvm/uvm_object.h>     /* XXX */
    #include <uvm/uvm_extern.h>     /* XXX */
    
    struct uvm_ractx;
    #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.
     */
    
    /*
     * Vnode types.  VNON means no type.
     */
    enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
    
    #define VNODE_TYPES \
        "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"
    
    /*
     * Vnode tag types.
     * These are for the benefit of external programs only (e.g., pstat)
     * and should NEVER be inspected by the kernel.
     */
   enum vtagtype   {
           VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS,
           VT_FDESC, VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS,
           VT_AFS, VT_ISOFS, VT_UNION, VT_ADOSFS, VT_EXT2FS, VT_CODA,
           VT_FILECORE, VT_NTFS, VT_VFS, VT_OVERLAY, VT_SMBFS, VT_PTYFS,
           VT_TMPFS, VT_UDF, VT_SYSVBFS, VT_PUFFS, VT_HFS, VT_EFS, VT_ZFS,
           VT_RUMP, VT_NILFS, VT_V7FS, VT_CHFS, VT_AUTOFS
   };
   
   #define VNODE_TAGS \
       "VT_NON", "VT_UFS", "VT_NFS", "VT_MFS", "VT_MSDOSFS", "VT_LFS", "VT_LOFS", \
       "VT_FDESC", "VT_PORTAL", "VT_NULL", "VT_UMAP", "VT_KERNFS", "VT_PROCFS", \
       "VT_AFS", "VT_ISOFS", "VT_UNION", "VT_ADOSFS", "VT_EXT2FS", "VT_CODA", \
       "VT_FILECORE", "VT_NTFS", "VT_VFS", "VT_OVERLAY", "VT_SMBFS", "VT_PTYFS", \
       "VT_TMPFS", "VT_UDF", "VT_SYSVBFS", "VT_PUFFS", "VT_HFS", "VT_EFS", \
       "VT_ZFS", "VT_RUMP", "VT_NILFS", "VT_V7FS", "VT_CHFS", "VT_AUTOFS"
   
   #if defined(_KERNEL) || defined(_KMEMUSER)
   struct vnode;
   struct buf;
   
   LIST_HEAD(buflists, buf);
   
   /*
    * Reading or writing any of these items requires holding the appropriate
    * lock.  Field markings and the corresponding locks:
    *
    *      -       stable, reference to the vnode is required
    *      b       bufcache_lock
    *      e       exec_lock
    *      f       vnode_free_list_lock, or vrele_lock for vrele_list
    *      i       v_interlock
    *      i+b     v_interlock + bufcache_lock to modify, either to inspect
    *      i+u     v_interlock + v_uobj.vmobjlock to modify, either to inspect
    *      k       locked by underlying filesystem (maybe kernel_lock)
    *      u       v_uobj.vmobjlock
    *      v       vnode lock
    *
    * Each underlying filesystem allocates its own private area and hangs
    * it from v_data.
    */
   struct vnode {
           /*
            * VM system related items.
            */
           struct uvm_object v_uobj;               /* u   the VM object */
           voff_t          v_size;                 /* i+u size of file */
           voff_t          v_writesize;            /* i+u new size after write */
   
           /*
            * Unstable items get their own cache line.
            * On _LP64 this fills the space nicely.
            */
           kcondvar_t      v_cv                    /* i   synchronization */
               __aligned(COHERENCY_UNIT);
           int             v_iflag;                /* i+u VI_* flags */
           int             v_uflag;                /* k   VU_* flags */
           int             v_usecount;             /* i   reference count */
           int             v_numoutput;            /* i   # of pending writes */
           int             v_writecount;           /* i   ref count of writers */
           int             v_holdcnt;              /* i   page & buffer refs */
           struct buflists v_cleanblkhd;           /* i+b clean blocklist head */
           struct buflists v_dirtyblkhd;           /* i+b dirty blocklist head */
   
           /*
            * The remaining items are largely stable.
            */
           int             v_vflag                 /* v   VV_* flags */
               __aligned(COHERENCY_UNIT);
           kmutex_t        *v_interlock;           /* -   vnode interlock */
           struct mount    *v_mount;               /* v   ptr to vfs we are in */
           int             (**v_op)(void *);       /* :   vnode operations vector */
           union {
                   struct mount    *vu_mountedhere;/* v   ptr to vfs (VDIR) */
                   struct socket   *vu_socket;     /* v   unix ipc (VSOCK) */
                   struct specnode *vu_specnode;   /* v   device (VCHR, VBLK) */
                   struct fifoinfo *vu_fifoinfo;   /* v   fifo (VFIFO) */
                   struct uvm_ractx *vu_ractx;     /* u   read-ahead ctx (VREG) */
           } v_un;
           enum vtype      v_type;                 /* -   vnode type */
           enum vtagtype   v_tag;                  /* -   type of underlying data */
           void            *v_data;                /* -   private data for fs */
           struct vnode_klist *v_klist;            /* i   kevent / knote info */
   
           void            *v_segvguard;           /* e   for PAX_SEGVGUARD */
   };
   #define v_mountedhere   v_un.vu_mountedhere
   #define v_socket        v_un.vu_socket
   #define v_specnode      v_un.vu_specnode
   #define v_fifoinfo      v_un.vu_fifoinfo
   #define v_ractx         v_un.vu_ractx
   
   typedef struct vnode vnode_t;
   
   /*
    * Structure that encompasses the kevent state for a vnode.  This is
    * carved out as a separate structure because some vnodes may share
    * this state with one another.
    *
    * N.B. if two vnodes share a vnode_klist, then they must also share
    * v_interlock.
    */
   struct vnode_klist {
           struct klist    vk_klist;       /* i   notes attached to vnode */
           long            vk_interest;    /* i   what the notes are interested in */
   };
   #endif
   
   /*
    * Vnode flags.  The first set are locked by vnode lock or are stable.
    * VSYSTEM is only used to skip vflush()ing quota files.  VISTTY is used
    * when reading dead vnodes.
    */
   #define VV_ROOT         0x00000001      /* root of its file system */
   #define VV_SYSTEM       0x00000002      /* vnode being used by kernel */
   #define VV_ISTTY        0x00000004      /* vnode represents a tty */
   #define VV_MAPPED       0x00000008      /* vnode might have user mappings */
   #define VV_MPSAFE       0x00000010      /* file system code is MP safe */
   
   /*
    * The second set are locked by vp->v_interlock.  VI_TEXT and VI_EXECMAP are
    * typically updated with vp->v_uobj.vmobjlock also held as the VM system
    * uses them for accounting purposes.
    */
   #define VI_TEXT         0x00000100      /* vnode is a pure text prototype */
   #define VI_EXECMAP      0x00000200      /* might have PROT_EXEC mappings */
   #define VI_WRMAP        0x00000400      /* might have PROT_WRITE u. mappings */
   #define VI_PAGES        0x00000800      /* UVM object has >0 pages */
   #define VI_ONWORKLST    0x00004000      /* On syncer work-list */
   #define VI_DEADCHECK    0x00008000      /* UVM: need to call vdead_check() */
   
   /*
    * The third set are locked by the underlying file system.
    */
   #define VU_DIROP        0x01000000      /* LFS: involved in a directory op */
   
   #define VNODE_FLAGBITS \
       "\2\1ROOT\2SYSTEM\3ISTTY\4MAPPED\5MPSAFE\11TEXT\12EXECMAP" \
       "\13WRMAP\14PAGES\17ONWORKLST\20DEADCHECK\31DIROP"
   
   #define VSIZENOTSET     ((voff_t)-1)
   
   /*
    * vnode lock flags
    */
   #define LK_NONE         0x00000000      /* no lock - for VOP_ISLOCKED() */
   #define LK_SHARED       0x00000001      /* shared lock */
   #define LK_EXCLUSIVE    0x00000002      /* exclusive lock */
   #define LK_UPGRADE      0x00000010      /* upgrade shared -> exclusive */
   #define LK_DOWNGRADE    0x00000020      /* downgrade exclusive -> shared */
   #define LK_NOWAIT       0x00000100      /* do not sleep to await lock */
   #define LK_RETRY        0x00000200      /* vn_lock: retry until locked */
   
   /*
    * Vnode attributes.  A field value of VNOVAL represents a field whose value
    * is unavailable (getattr) or which is not to be changed (setattr).
    */
   struct vattr {
           enum vtype      va_type;        /* vnode type (for create) */
           mode_t          va_mode;        /* files access mode and type */
           nlink_t         va_nlink;       /* number of references to file */
           uid_t           va_uid;         /* owner user id */
           gid_t           va_gid;         /* owner group id */
           dev_t           va_fsid;        /* file system id (dev for now) */
           ino_t           va_fileid;      /* file id */
           u_quad_t        va_size;        /* file size in bytes */
           long            va_blocksize;   /* blocksize preferred for i/o */
           struct timespec va_atime;       /* time of last access */
           struct timespec va_mtime;       /* time of last modification */
           struct timespec va_ctime;       /* time file changed */
           struct timespec va_birthtime;   /* time file created */
           u_long          va_gen;         /* generation number of file */
           u_long          va_flags;       /* flags defined for file */
           dev_t           va_rdev;        /* device the special file represents */
           u_quad_t        va_bytes;       /* bytes of disk space held by file */
           u_quad_t        va_filerev;     /* file modification number */
           unsigned int    va_vaflags;     /* operations flags, see below */
           long            va_spare;       /* remain quad aligned */
   };
   
   /*
    * Flags for va_vaflags.
    */
   #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
   #define VA_EXCLUSIVE    0x02            /* exclusive create request */
   
   #ifdef _KERNEL
   
   /*
    * Flags for ioflag.
    */
   #define IO_UNIT         0x00010         /* do I/O as atomic unit */
   #define IO_APPEND       0x00020         /* append write to end */
   #define IO_SYNC         (0x40|IO_DSYNC) /* sync I/O file integrity completion */
   #define IO_NODELOCKED   0x00080         /* underlying node already locked */
   #define IO_NDELAY       0x00100         /* FNDELAY flag set in file table */
   #define IO_DSYNC        0x00200         /* sync I/O data integrity completion */
   #define IO_ALTSEMANTICS 0x00400         /* use alternate i/o semantics */
   #define IO_NORMAL       0x00800         /* operate on regular data */
   #define IO_EXT          0x01000         /* operate on extended attributes */
   #define IO_DIRECT       0x02000         /* direct I/O hint */
   #define IO_JOURNALLOCKED 0x04000        /* journal is already locked */
   #define IO_ADV_MASK     0x00003         /* access pattern hint */
   
   #define IO_ADV_SHIFT    0
   #define IO_ADV_ENCODE(adv)      (((adv) << IO_ADV_SHIFT) & IO_ADV_MASK)
   #define IO_ADV_DECODE(ioflag)   (((ioflag) & IO_ADV_MASK) >> IO_ADV_SHIFT)
   
   /*
    * Flags for accmode_t.
    */
   #define VEXEC                   000000000100 /* execute/search permission */
   #define VWRITE                  000000000200 /* write permission */
   #define VREAD                   000000000400 /* read permission */
   #define VADMIN                  000000010000 /* being the file owner */
   #define VAPPEND                 000000040000 /* permission to write/append */
   
   /*
    * VEXPLICIT_DENY makes VOP_ACCESSX(9) return EPERM or EACCES only
    * if permission was denied explicitly, by a "deny" rule in NFSv4 ACL,
    * and 0 otherwise.  This never happens with ordinary unix access rights
    * or POSIX.1e ACLs.  Obviously, VEXPLICIT_DENY must be OR-ed with
    * some other V* constant.
    */
   #define VEXPLICIT_DENY          000000100000
   #define VREAD_NAMED_ATTRS       000000200000 /* not used */
   #define VWRITE_NAMED_ATTRS      000000400000 /* not used */
   #define VDELETE_CHILD           000001000000
   #define VREAD_ATTRIBUTES        000002000000 /* permission to stat(2) */
   #define VWRITE_ATTRIBUTES       000004000000 /* change {m,c,a}time */
   #define VDELETE                 000010000000
   #define VREAD_ACL               000020000000 /* read ACL and file mode */
   #define VWRITE_ACL              000040000000 /* change ACL and/or file mode */
   #define VWRITE_OWNER            000100000000 /* change file owner */
   #define VSYNCHRONIZE            000200000000 /* not used */
   #define VCREAT                  000400000000 /* creating new file */
   #define VVERIFY                 001000000000 /* verification required */
   
   #define __VNODE_PERM_BITS       \
           "\1"                   \
           "\07VEXEC"              \
           "\10VWRITE"             \
           "\11VREAD"              \
           "\15VADMIN"             \
           "\17VAPPEND"            \
           "\20VEXPLICIT_DENY"     \
           "\21VREAD_NAMED_ATTRS"  \
           "\22VWRITE_NAMED_ATTRS" \
           "\23VDELETE_CHILD"      \
           "\24VREAD_ATTRIBUTES"   \
           "\25VWRITE_ATTRIBUTES"  \
           "\26VDELETE"            \
           "\27VREAD_ACL"          \
           "\30VWRITE_ACL"         \
           "\31VWRITE_OWNER"       \
           "\32VSYNCHRONIZE"       \
           "\33VCREAT"             \
           "\34VVERIFY"
   
   /*
    * Permissions that were traditionally granted only to the file owner.
    */
   #define VADMIN_PERMS    (VADMIN | VWRITE_ATTRIBUTES | VWRITE_ACL | \
       VWRITE_OWNER)
   
   /*
    * Permissions that were traditionally granted to everyone.
    */
   #define VSTAT_PERMS     (VREAD_ATTRIBUTES | VREAD_ACL)
   
   /*
    * Permissions that allow to change the state of the file in any way.
    */
   #define VMODIFY_PERMS   (VWRITE | VAPPEND | VADMIN_PERMS | VDELETE_CHILD | \
       VDELETE)
   
   /*
    * Token indicating no attribute value yet assigned.
    */
   #define VNOVAL  (-1)
   #define VNOVALSIZE ((u_quad_t)-1)
   #define VNOVALFLAGS ((u_long)-1)
   
   /*
    * Convert between vnode types and inode formats (since POSIX.1
    * defines mode word of stat structure in terms of inode formats).
    */
   extern const enum vtype iftovt_tab[];
   extern const 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 closeure */
   #define WRITECLOSE      0x0004          /* vflush: only close writable files */
   #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
   
   /*
    * Flags to various vnode operations.
    */
   #define REVOKEALL       0x0001          /* revoke: revoke all aliases */
   
   #define FSYNC_WAIT      0x0001          /* fsync: wait for completion */
   #define FSYNC_DATAONLY  0x0002          /* fsync: hint: sync file data only */
   #define FSYNC_RECLAIM   0x0004          /* fsync: hint: vnode is being reclaimed */
   #define FSYNC_LAZY      0x0008          /* fsync: lazy sync (trickle) */
   #define FSYNC_NOLOG     0x0010          /* fsync: do not flush the log */
   #define FSYNC_CACHE     0x0100          /* fsync: flush disk caches too */
   
   #define UPDATE_WAIT     0x0001          /* update: wait for completion */
   #define UPDATE_DIROP    0x0002          /* update: hint to fs to wait or not */
   #define UPDATE_CLOSE    0x0004          /* update: clean up on close */
   
   #define VDEAD_NOWAIT    0x0001          /* vdead_check: do not sleep */
   
   void holdrelel(struct vnode *);
   void holdrele(struct vnode *);
   void vholdl(struct vnode *);
   void vhold(struct vnode *);
   void vref(struct vnode *);
   
   #define NULLVP  ((struct vnode *)NULL)
   
   /*
    * Macro to determine kevent interest on a vnode.
    */
   #define _VN_KEVENT_INTEREST(vp, n)                                      \
           (((vp)->v_klist->vk_interest & (n)) != 0)
   
   static inline bool
   VN_KEVENT_INTEREST(struct vnode *vp, long hint)
   {
           mutex_enter(vp->v_interlock);
           bool rv = _VN_KEVENT_INTEREST(vp, hint);
           mutex_exit(vp->v_interlock);
           return rv;
   }
   
   static inline void
   VN_KNOTE(struct vnode *vp, long hint)
   {
           mutex_enter(vp->v_interlock);
           if (__predict_false(_VN_KEVENT_INTEREST(vp, hint))) {
                   knote(&vp->v_klist->vk_klist, hint);
           }
           mutex_exit(vp->v_interlock);
   }
   
   void    vn_knote_attach(struct vnode *, struct knote *);
   void    vn_knote_detach(struct vnode *, struct knote *);
   
   /*
    * Global vnode data.
    */
   extern struct vnode     *rootvnode;     /* root (i.e. "/") vnode */
   extern int              desiredvnodes;  /* number of vnodes desired */
   extern unsigned int     numvnodes;      /* current number of vnodes */
   
   #endif /* _KERNEL */
   
   
   /*
    * Mods for exensibility.
    */
   
   /*
    * Flags for vdesc_flags:
    */
   #define VDESC_MAX_VPS           8
   /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
   #define VDESC_VP0_WILLRELE      0x00000001
   #define VDESC_VP1_WILLRELE      0x00000002
   #define VDESC_VP2_WILLRELE      0x00000004
   #define VDESC_VP3_WILLRELE      0x00000008
   #define VDESC_VP0_WILLPUT       0x00000101
   #define VDESC_VP1_WILLPUT       0x00000202
   #define VDESC_VP2_WILLPUT       0x00000404
   #define VDESC_VP3_WILLPUT       0x00000808
   
   /*
    * VDESC_NO_OFFSET is used to identify the end of the offset list
    * and in places where no such field exists.
    */
   #define VDESC_NO_OFFSET -1
   
   /*
    * This structure describes the vnode operation taking place.
    */
   struct vnodeop_desc {
           int             vdesc_offset;   /* offset in vector--first for speed */
           const char      *vdesc_name;    /* a readable name for debugging */
           int             vdesc_flags;    /* VDESC_* flags */
   
           /*
            * These ops are used by bypass routines to map and locate arguments.
            * Creds and procs are not needed in bypass routines, but sometimes
            * they are useful to (for example) transport layers.
            * Nameidata is useful because it has a cred in it.
            */
           const int       *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
           int             vdesc_vpp_offset;       /* return vpp location */
           int             vdesc_cred_offset;      /* cred location, if any */
           int             vdesc_componentname_offset; /* if any */
   };
   
   #ifdef _KERNEL
   
   extern const struct vnodeop_desc * const vfs_op_descs[];
   
   /*
    * Union filesystem hook for vn_readdir().
    */
   extern int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *);
   
   /*
    * Macros for offsets in the vdesc struct.
    */
   #define VOPARG_OFFSETOF(type, member)   offsetof(type, member)
   #define VOPARG_OFFSETTO(type,offset,sp) ((type)(((char *)(sp)) + (offset)))
   
   /*
    * This structure is used to configure the new vnodeops vector.
    */
   struct vnodeopv_entry_desc {
           const struct vnodeop_desc *opve_op;     /* which operation this is */
           int (*opve_impl)(void *);       /* code implementing this operation */
   };
   
   struct vnodeopv_desc {
                           /* ptr to the ptr to the vector where op should go */
           int (***opv_desc_vector_p)(void *);
           const struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
   };
   
   /*
    * A default routine which just returns an error.
    */
   int vn_default_error(void *);
   
   /*
    * A generic structure.
    * This can be used by bypass routines to identify generic arguments.
    */
   struct vop_generic_args {
           struct vnodeop_desc *a_desc;
           /* other random data follows, presumably */
   };
   
   /*
    * 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.
    */
   /*
    * actually, vclean doesn't use it anymore, but nfs does,
    * for device specials and fifos.
    */
   #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
   
   /*
    * This call works for vnodes in the kernel.
    */
   #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
   #define VDESC(OP) (& __CONCAT(OP,_desc))
   #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
   
   /* XXX This include should go away */
   #include <sys/mount.h>
   
   /*
    * Finally, include the default set of vnode operations.
    */
   #include <sys/vnode_if.h>
   
   /*
    * Public vnode manipulation functions.
    */
   struct file;
   struct filedesc;
   struct nameidata;
   struct pathbuf;
   struct proc;
   struct stat;
   struct uio;
   struct vattr;
   struct vnode;
   
   /* see vnode(9) */
   void    vfs_vnode_sysinit(void);
   int     bdevvp(dev_t, struct vnode **);
   int     cdevvp(dev_t, struct vnode **);
   void    vattr_null(struct vattr *);
   void    vdevgone(int, int, int, enum vtype);
   int     vfinddev(dev_t, enum vtype, struct vnode **);
   int     vflush(struct mount *, struct vnode *, int);
   int     vflushbuf(struct vnode *, int);
   void    vgone(struct vnode *);
   int     vinvalbuf(struct vnode *, int, kauth_cred_t, struct lwp *, bool, int);
   void    vprint(const char *, struct vnode *);
   void    vput(struct vnode *);
   bool    vrecycle(struct vnode *);
   void    vrele(struct vnode *);
   void    vrele_async(struct vnode *);
   void    vrele_flush(struct mount *);
   int     vtruncbuf(struct vnode *, daddr_t, bool, int);
   void    vwakeup(struct buf *);
   int     vdead_check(struct vnode *, int);
   void    vrevoke(struct vnode *);
   void    vremfree(struct vnode *);
   void    vshareilock(struct vnode *, struct vnode *);
   void    vshareklist(struct vnode *, struct vnode *);
   int     vrefcnt(struct vnode *);
   int     vcache_get(struct mount *, const void *, size_t, struct vnode **);
   int     vcache_new(struct mount *, struct vnode *,
               struct vattr *, kauth_cred_t, void *, struct vnode **);
   int     vcache_rekey_enter(struct mount *, struct vnode *,
               const void *, size_t, const void *, size_t);
   void    vcache_rekey_exit(struct mount *, struct vnode *,
               const void *, size_t, const void *, size_t);
   
   /* see vnsubr(9) */
   int     vn_bwrite(void *);
   int     vn_close(struct vnode *, int, kauth_cred_t);
   int     vn_isunder(struct vnode *, struct vnode *, struct lwp *);
   int     vn_lock(struct vnode *, int);
   void    vn_markexec(struct vnode *);
   int     vn_marktext(struct vnode *);
   int     vn_open(struct vnode *, struct pathbuf *, int, int, int,
               struct vnode **, bool *, int *);
   int     vn_rdwr(enum uio_rw, struct vnode *, void *, int, off_t, enum uio_seg,
       int, kauth_cred_t, size_t *, struct lwp *);
   int     vn_readdir(struct file *, char *, int, unsigned int, int *,
       struct lwp *, off_t **, int *);
   int     vn_stat(struct vnode *, struct stat *);
   int     vn_kqfilter(struct file *, struct knote *);
   int     vn_writechk(struct vnode *);
   int     vn_openchk(struct vnode *, kauth_cred_t, int);
   int     vn_extattr_get(struct vnode *, int, int, const char *, size_t *,
               void *, struct lwp *);
   int     vn_extattr_set(struct vnode *, int, int, const char *, size_t,
               const void *, struct lwp *);
   int     vn_extattr_rm(struct vnode *, int, int, const char *, struct lwp *);
   int     vn_fifo_bypass(void *);
   int     vn_bdev_open(dev_t, struct vnode **, struct lwp *);
   int     vn_bdev_openpath(struct pathbuf *pb, struct vnode **, struct lwp *);
   
   
   /* initialise global vnode management */
   void    vntblinit(void);
   
   /* misc stuff */
   void    sched_sync(void *);
   void    vn_syncer_add_to_worklist(struct vnode *, int);
   void    vn_syncer_remove_from_worklist(struct vnode *);
   int     dorevoke(struct vnode *, kauth_cred_t);
   int     rawdev_mounted(struct vnode *, struct vnode **);
   uint8_t vtype2dt(enum vtype);
   
   /* see vfssubr(9) */
   int     vfs_unixify_accmode(accmode_t *);
   void    vfs_getnewfsid(struct mount *);
   void    vfs_timestamp(struct timespec *);
   #if defined(DDB) || defined(DEBUGPRINT)
   void    vfs_vnode_print(struct vnode *, int, void (*)(const char *, ...)
       __printflike(1, 2));
   void    vfs_vnode_lock_print(void *, int, void (*)(const char *, ...)
       __printflike(1, 2));
   void    vfs_mount_print(struct mount *, int, void (*)(const char *, ...)
       __printflike(1, 2));
   void    vfs_mount_print_all(int, void (*)(const char *, ...)
       __printflike(1, 2));
   #endif /* DDB */
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_VNODE_H_ */

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