The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1985, 1989, 1991, 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  *      @(#)namei.h     8.5 (Berkeley) 1/9/95
   34  * $FreeBSD: src/sys/sys/namei.h,v 1.29.2.2 2001/09/30 21:12:54 luigi Exp $
   35  * $DragonFly: src/sys/sys/namei.h,v 1.15 2004/11/12 00:09:27 dillon Exp $
   36  */
   37 
   38 #ifndef _SYS_NAMEI_H_
   39 #define _SYS_NAMEI_H_
   40 
   41 #include <sys/queue.h>
   42 #include <sys/uio.h>
   43 
   44 #ifdef _KERNEL
   45 #ifndef _SYS_THREAD_H_
   46 #include <sys/thread.h>
   47 #endif
   48 #ifndef _SYS_PROC_H_
   49 #include <sys/proc.h>
   50 #endif
   51 #endif
   52 
   53 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
   54 #ifndef _SYS_NCHSTATS_H_
   55 #include <sys/nchstats.h>
   56 #endif
   57 #endif
   58 
   59 struct componentname {
   60         /*
   61          * Arguments to lookup.
   62          */
   63         u_long  cn_nameiop;     /* namei operation */
   64         u_long  cn_flags;       /* flags to namei */
   65         struct  thread *cn_td;  /* process requesting lookup */
   66         struct  ucred *cn_cred; /* credentials */
   67         /*
   68          * Shared between lookup and commit routines.
   69          */
   70         char    *cn_nameptr;    /* pointer to looked up name */
   71         long    cn_namelen;     /* length of looked up component */
   72         long    cn_consume;     /* chars to consume in lookup() */
   73         int     cn_timeout;     /* if CNP_CACHETIMEOUT is set, in ticks */
   74         struct vnode *cn_notvp; /* used by NFS to check for collision */
   75 };
   76 
   77 #ifdef _KERNEL
   78 /*
   79  * namei operations
   80  */
   81 #define NAMEI_LOOKUP    0       /* perform name lookup only */
   82 #define NAMEI_CREATE    1       /* setup for file creation */
   83 #define NAMEI_DELETE    2       /* setup for file deletion */
   84 #define NAMEI_RENAME    3       /* setup for file renaming */
   85 #define NAMEI_OPMASK    3       /* mask for operation */
   86 /*
   87  * namei operational modifier flags, stored in ni_cnd.flags
   88  */
   89         /* (LOCKLEAF)       0x00000004  */
   90 #define CNP_LOCKPARENT      0x00000008  /* return parent vnode locked */
   91 #define CNP_WANTPARENT      0x00000010  /* return parent vnode unlocked */
   92         /* (NOCACHE)        0x00000020  */
   93 #define CNP_FOLLOW          0x00000040  /* follow symbolic links */
   94         /* (NOOBJ)          0x00000080  */
   95 #define CNP_MODMASK         0x00c000fc  /* mask of operational modifiers */
   96 /*
   97  * Namei parameter descriptors.
   98  */
   99         /* (NOCROSSMOUNT)   0x00000100 */
  100 #define CNP_RDONLY          0x00000200 /* lookup with read-only semantics */
  101 #define CNP_NOTVP           0x00000400 /* test cn_notvp, fail if matches */
  102         /* (SAVENAME)       0x00000800 */
  103         /* (CNP_SAVESTART)  0x00001000 */
  104 #define CNP_ISDOTDOT        0x00002000 /* current component name is .. */
  105         /* (MAKEENTRY)      0x00004000 */
  106         /* (ISLASTCN)       0x00008000 */
  107         /* (ISSYMLINK)      0x00010000 */
  108 #define CNP_ISWHITEOUT      0x00020000 /* found whiteout */
  109 #define CNP_DOWHITEOUT      0x00040000 /* do whiteouts */
  110         /* (WILLBEDIR)      0x00080000 */
  111         /* (ISUNICODE)      0x00100000 */
  112 #define CNP_PDIRUNLOCK      0x00200000 /* fs lookup() unlocked parent dir */
  113         /* (WANTDNCP)       0x00400000 */
  114         /* (WANTNCP)        0x00800000 */
  115         /* (CACHETIMEOUT)   0x01000000 */
  116 #define CNP_PARAMASK        0x011fff00 /* mask of parameter descriptors */
  117 
  118 extern int varsym_enable;
  119 
  120 int     relookup (struct vnode *dvp, struct vnode **vpp,
  121             struct componentname *cnp);
  122 #endif
  123 
  124 #endif /* !_SYS_NAMEI_H_ */

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