sys/sys/namei.h

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)namei.h     8.5 (Berkeley) 1/9/95
  30  * $FreeBSD: src/sys/sys/namei.h,v 1.29.2.2 2001/09/30 21:12:54 luigi Exp $
  31  * $DragonFly: src/sys/sys/namei.h,v 1.15 2004/11/12 00:09:27 dillon Exp $
  32  */
  33
  34 #ifndef _SYS_NAMEI_H_
  35 #define _SYS_NAMEI_H_
  36
  37 #include <sys/queue.h>
  38 #include <sys/uio.h>
  39
  40 #ifdef _KERNEL
  41 #ifndef _SYS_THREAD_H_
  42 #include <sys/thread.h>
  43 #endif
  44 #ifndef _SYS_PROC_H_
  45 #include <sys/proc.h>
  46 #endif
  47 #endif
  48
  49 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  50 #ifndef _SYS_NCHSTATS_H_
  51 #include <sys/nchstats.h>
  52 #endif
  53 #endif
  54
  55 struct componentname {
  56         /*
  57          * Arguments to lookup.
  58          */
  59         u_long  cn_nameiop;     /* namei operation */
  60         u_long  cn_flags;       /* flags to namei */
  61         struct  thread *cn_td;  /* process requesting lookup */
  62         struct  ucred *cn_cred; /* credentials */
  63         /*
  64          * Shared between lookup and commit routines.
  65          */
  66         char    *cn_nameptr;    /* pointer to looked up name */
  67         long    cn_namelen;     /* length of looked up component */
  68         long    cn_consume;     /* chars to consume in lookup() */
  69         int     cn_timeout;     /* if CNP_CACHETIMEOUT is set, in ticks */
  70         struct vnode *cn_notvp; /* used by NFS to check for collision */
  71 };
  72
  73 #ifdef _KERNEL
  74 /*
  75  * namei operations
  76  */
  77 #define NAMEI_LOOKUP    0       /* perform name lookup only */
  78 #define NAMEI_CREATE    1       /* setup for file creation */
  79 #define NAMEI_DELETE    2       /* setup for file deletion */
  80 #define NAMEI_RENAME    3       /* setup for file renaming */
  81 #define NAMEI_OPMASK    3       /* mask for operation */
  82 /*
  83  * namei operational modifier flags, stored in ni_cnd.flags
  84  */
  85         /* (LOCKLEAF)       0x00000004  */
  86 #define CNP_LOCKPARENT      0x00000008  /* return parent vnode locked */
  87 #define CNP_WANTPARENT      0x00000010  /* return parent vnode unlocked */
  88         /* (NOCACHE)        0x00000020  */
  89 #define CNP_FOLLOW          0x00000040  /* follow symbolic links */
  90         /* (NOOBJ)          0x00000080  */
  91 #define CNP_MODMASK         0x00c000fc  /* mask of operational modifiers */
  92 /*
  93  * Namei parameter descriptors.
  94  */
  95         /* (NOCROSSMOUNT)   0x00000100 */
  96 #define CNP_RDONLY          0x00000200 /* lookup with read-only semantics */
  97 #define CNP_NOTVP           0x00000400 /* test cn_notvp, fail if matches */
  98         /* (SAVENAME)       0x00000800 */
  99         /* (CNP_SAVESTART)  0x00001000 */
 100 #define CNP_ISDOTDOT        0x00002000 /* current component name is .. */
 101         /* (MAKEENTRY)      0x00004000 */
 102         /* (ISLASTCN)       0x00008000 */
 103         /* (ISSYMLINK)      0x00010000 */
 104 #define CNP_ISWHITEOUT      0x00020000 /* found whiteout */
 105 #define CNP_DOWHITEOUT      0x00040000 /* do whiteouts */
 106         /* (WILLBEDIR)      0x00080000 */
 107         /* (ISUNICODE)      0x00100000 */
 108 #define CNP_PDIRUNLOCK      0x00200000 /* fs lookup() unlocked parent dir */
 109         /* (WANTDNCP)       0x00400000 */
 110         /* (WANTNCP)        0x00800000 */
 111         /* (CACHETIMEOUT)   0x01000000 */
 112 #define CNP_PARAMASK        0x011fff00 /* mask of parameter descriptors */
 113
 114 extern int varsym_enable;
 115
 116 int     relookup (struct vnode *dvp, struct vnode **vpp,
 117             struct componentname *cnp);
 118 #endif
 119
 120 #endif /* !_SYS_NAMEI_H_ */