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

     /*
      * Copyright (c) 1985, 1989, 1991, 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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.
     *
     *      @(#)namei.h     8.5 (Berkeley) 1/9/95
     * $FreeBSD: src/sys/sys/namei.h,v 1.29.2.2 2001/09/30 21:12:54 luigi Exp $
     * $DragonFly: src/sys/sys/namei.h,v 1.15 2004/11/12 00:09:27 dillon Exp $
     */
    
    #ifndef _SYS_NAMEI_H_
    #define _SYS_NAMEI_H_
    
    #include <sys/queue.h>
    #include <sys/uio.h>
    
    #ifdef _KERNEL
    #ifndef _SYS_THREAD_H_
    #include <sys/thread.h>
    #endif
    #ifndef _SYS_PROC_H_
    #include <sys/proc.h>
    #endif
    #endif
    
    #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
    #ifndef _SYS_NCHSTATS_H_
    #include <sys/nchstats.h>
    #endif
    #endif
    
    struct componentname {
            /*
             * Arguments to lookup.
             */
            u_long  cn_nameiop;     /* namei operation */
            u_long  cn_flags;       /* flags to namei */
            struct  thread *cn_td;  /* process requesting lookup */
            struct  ucred *cn_cred; /* credentials */
            /*
             * Shared between lookup and commit routines.
             */
            char    *cn_nameptr;    /* pointer to looked up name */
            long    cn_namelen;     /* length of looked up component */
            long    cn_consume;     /* chars to consume in lookup() */
            int     cn_timeout;     /* if CNP_CACHETIMEOUT is set, in ticks */
            struct vnode *cn_notvp; /* used by NFS to check for collision */
    };
    
    #ifdef _KERNEL
    /*
     * namei operations
     */
    #define NAMEI_LOOKUP    0       /* perform name lookup only */
    #define NAMEI_CREATE    1       /* setup for file creation */
    #define NAMEI_DELETE    2       /* setup for file deletion */
    #define NAMEI_RENAME    3       /* setup for file renaming */
    #define NAMEI_OPMASK    3       /* mask for operation */
    /*
     * namei operational modifier flags, stored in ni_cnd.flags
     */
            /* (LOCKLEAF)       0x00000004  */
    #define CNP_LOCKPARENT      0x00000008  /* return parent vnode locked */
    #define CNP_WANTPARENT      0x00000010  /* return parent vnode unlocked */
            /* (NOCACHE)        0x00000020  */
    #define CNP_FOLLOW          0x00000040  /* follow symbolic links */
            /* (NOOBJ)          0x00000080  */
    #define CNP_MODMASK         0x00c000fc  /* mask of operational modifiers */
    /*
     * Namei parameter descriptors.
     */
            /* (NOCROSSMOUNT)   0x00000100 */
   #define CNP_RDONLY          0x00000200 /* lookup with read-only semantics */
   #define CNP_NOTVP           0x00000400 /* test cn_notvp, fail if matches */
           /* (SAVENAME)       0x00000800 */
           /* (CNP_SAVESTART)  0x00001000 */
   #define CNP_ISDOTDOT        0x00002000 /* current component name is .. */
           /* (MAKEENTRY)      0x00004000 */
           /* (ISLASTCN)       0x00008000 */
           /* (ISSYMLINK)      0x00010000 */
   #define CNP_ISWHITEOUT      0x00020000 /* found whiteout */
   #define CNP_DOWHITEOUT      0x00040000 /* do whiteouts */
           /* (WILLBEDIR)      0x00080000 */
           /* (ISUNICODE)      0x00100000 */
   #define CNP_PDIRUNLOCK      0x00200000 /* fs lookup() unlocked parent dir */
           /* (WANTDNCP)       0x00400000 */
           /* (WANTNCP)        0x00800000 */
           /* (CACHETIMEOUT)   0x01000000 */
   #define CNP_PARAMASK        0x011fff00 /* mask of parameter descriptors */
   
   extern int varsym_enable;
   
   int     relookup (struct vnode *dvp, struct vnode **vpp,
               struct componentname *cnp);
   #endif
   
   #endif /* !_SYS_NAMEI_H_ */

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