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 1.4 2005/03/09 06:11:22 hmp 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
  44 struct vnode;
  45 struct vattr;
  46 struct mount;
  47 struct namecache;
  48 struct thread;
  49 struct ucred;
  50
  51 /*
  52  * nlookup component
  53  */
  54 struct nlcomponent {
  55         char            *nlc_nameptr;
  56         int             nlc_namelen;
  57 };
  58
  59 /*
  60  * Encapsulation of nlookup parameters.
  61  *
  62  * Note on nl_flags and nl_op: nl_flags supports a simplified subset of
  63  * namei's original CNP flags.  nl_op (e.g. NAMEI_*) does no in any way
  64  * effect the state of the returned namecache and is only used to enforce
  65  * access checks.
  66  */
  67 struct nlookupdata {
  68         /*
  69          * These fields are setup by nlookup_init() with nl_ncp set to
  70          * the current directory if a process or the root directory if
  71          * a pure thread.  The result from nlookup() will be returned in
  72          * nl_ncp.
  73          */
  74         struct namecache *nl_ncp;       /* start-point and result */
  75         struct namecache *nl_rootncp;   /* root directory */
  76         struct namecache *nl_jailncp;   /* jail directory */
  77
  78         char            *nl_path;       /* path buffer */
  79         struct thread   *nl_td;         /* thread requesting the nlookup */
  80         struct ucred    *nl_cred;       /* credentials for nlookup */
  81
  82         int             nl_flags;       /* operations flags */
  83         int             nl_loopcnt;     /* symlinks encountered */
  84
  85         /*
  86          * These fields are populated by vn_open().  nlookup_done() will
  87          * vn_close() a non-NULL vp so if you extract it be sure to NULL out
  88          * nl_open_vp.
  89          */
  90         struct  vnode   *nl_open_vp;
  91         int             nl_vp_fmode;
  92 };
  93
  94 #define NLC_FOLLOW              0x00000001      /* follow leaf symlink */
  95 #define NLC_NOCROSSMOUNT        0x00000002      /* do not cross mount points */
  96 #define NLC_HASBUF              0x00000004      /* nl_path is allocated */
  97 #define NLC_ISWHITEOUT          0x00000008
  98 #define NLC_WILLBEDIR           0x00000010
  99 #define NLC_NCPISLOCKED         0x00000020
 100 #define NLC_LOCKVP              0x00000040      /* nl_open_vp from vn_open */
 101 #define NLC_CREATE              0x00000080
 102 #define NLC_DELETE              0x00000100
 103 #define NLC_NFS_RDONLY          0x00010000      /* set by nfs_namei() only */
 104 #define NLC_NFS_NOSOFTLINKTRAV  0x00020000      /* do not traverse softlnks */
 105
 106 #ifdef _KERNEL
 107
 108 int nlookup_init(struct nlookupdata *, const char *, enum uio_seg, int);
 109 int nlookup_init_raw(struct nlookupdata *, const char *, enum uio_seg, int, struct ucred *, struct namecache *);
 110 void nlookup_set_cred(struct nlookupdata *nd, struct ucred *cred);
 111 void nlookup_zero(struct nlookupdata *);
 112 void nlookup_done(struct nlookupdata *);
 113 struct namecache *nlookup_simple(const char *str, enum uio_seg seg,
 114                                 int niflags, int *error);
 115 int nlookup_mp(struct mount *mp, struct namecache **ncpp);
 116 int nlookup(struct nlookupdata *);
 117 int nreadsymlink(struct nlookupdata *nd, struct namecache *ncp,
 118                                 struct nlcomponent *nlc);
 119 int naccess(struct namecache *ncp, int vmode, struct ucred *cred);
 120 int naccess_va(struct vattr *va, int vmode, struct ucred *cred);
 121
 122 #endif
 123
 124 #endif /* !_SYS_NAMEI_H_ */