sys/sys/nlookup.h

   1 /*
   2  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/sys/nlookup.h,v 1.6 2008/05/09 17:52:18 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_NLOOKUP_H_
  38 #define _SYS_NLOOKUP_H_
  39
  40 #ifndef _SYS_UIO_H_
  41 #include <sys/uio.h>
  42 #endif
  43 #ifndef _SYS_NAMECACHE_H_
  44 #include <sys/namecache.h>
  45 #endif
  46
  47 struct vnode;
  48 struct vattr;
  49 struct mount;
  50 struct thread;
  51 struct ucred;
  52
  53 /*
  54  * nlookup component
  55  */
  56 struct nlcomponent {
  57         char            *nlc_nameptr;
  58         int             nlc_namelen;
  59 };
  60
  61 /*
  62  * Encapsulation of nlookup parameters.
  63  *
  64  * Note on nl_flags and nl_op: nl_flags supports a simplified subset of
  65  * namei's original CNP flags.  nl_op (e.g. NAMEI_*) does no in any way
  66  * effect the state of the returned namecache and is only used to enforce
  67  * access checks.
  68  */
  69 struct nlookupdata {
  70         /*
  71          * These fields are setup by nlookup_init() with nl_nch set to
  72          * the current directory if a process or the root directory if
  73          * a pure thread.  The result from nlookup() will be returned in
  74          * nl_nch.
  75          */
  76         struct nchandle nl_nch;         /* start-point and result */
  77         struct nchandle nl_rootnch;     /* root directory */
  78         struct nchandle nl_jailnch;     /* jail directory */
  79
  80         char            *nl_path;       /* path buffer */
  81         struct thread   *nl_td;         /* thread requesting the nlookup */
  82         struct ucred    *nl_cred;       /* credentials for nlookup */
  83         struct vnode    *nl_dvp;        /* NLC_REFDVP */
  84
  85         int             nl_flags;       /* operations flags */
  86         int             nl_loopcnt;     /* symlinks encountered */
  87
  88         /*
  89          * These fields are populated by vn_open().  nlookup_done() will
  90          * vn_close() a non-NULL vp so if you extract it be sure to NULL out
  91          * nl_open_vp.
  92          */
  93         struct  vnode   *nl_open_vp;
  94         int             nl_vp_fmode;
  95 };
  96
  97 #define NLC_FOLLOW              0x00000001      /* follow leaf symlink */
  98 #define NLC_NOCROSSMOUNT        0x00000002      /* do not cross mount points */
  99 #define NLC_HASBUF              0x00000004      /* nl_path is allocated */
 100 #define NLC_ISWHITEOUT          0x00000008
 101 #define NLC_WILLBEDIR           0x00000010
 102 #define NLC_NCPISLOCKED         0x00000020
 103 #define NLC_LOCKVP              0x00000040      /* nl_open_vp from vn_open */
 104 #define NLC_CREATE              0x00000080
 105 #define NLC_DELETE              0x00000100
 106 #define NLC_NFS_RDONLY          0x00010000      /* set by nfs_namei() only */
 107 #define NLC_NFS_NOSOFTLINKTRAV  0x00020000      /* do not traverse softlnks */
 108 #define NLC_REFDVP              0x00040000      /* set ref'd/unlocked nl_dvp */
 109
 110 #ifdef _KERNEL
 111
 112 int nlookup_init(struct nlookupdata *, const char *, enum uio_seg, int);
 113 int nlookup_init_raw(struct nlookupdata *, const char *, enum uio_seg, int, struct ucred *, struct nchandle *);
 114 void nlookup_set_cred(struct nlookupdata *nd, struct ucred *cred);
 115 void nlookup_zero(struct nlookupdata *);
 116 void nlookup_done(struct nlookupdata *);
 117 struct nchandle nlookup_simple(const char *str, enum uio_seg seg,
 118                                 int niflags, int *error);
 119 int nlookup_mp(struct mount *mp, struct nchandle *nch);
 120 int nlookup(struct nlookupdata *);
 121 int nreadsymlink(struct nlookupdata *nd, struct nchandle *nch,
 122                                 struct nlcomponent *nlc);
 123 int naccess(struct nchandle *nch, int vmode, struct ucred *cred);
 124 int naccess_va(struct vattr *va, int vmode, struct ucred *cred);
 125
 126 #endif
 127
 128 #endif /* !_SYS_NAMEI_H_ */