| 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 1.12 2004/04/08 22:00:40 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_pnbuf; /* pathname buffer */ |
| 71 | char *cn_nameptr; /* pointer to looked up name */ |
| 72 | long cn_namelen; /* length of looked up component */ |
| 73 | long cn_consume; /* chars to consume in lookup() */ |
| 74 | int cn_timeout; /* if CNP_CACHETIMEOUT is set, in ticks */ |
| 75 | }; |
| 76 | |
| 77 | /* |
| 78 | * Encapsulation of namei parameters. |
| 79 | */ |
| 80 | struct nameidata { |
| 81 | /* |
| 82 | * Arguments to namei/lookup. |
| 83 | */ |
| 84 | const char *ni_dirp; /* pathname pointer */ |
| 85 | enum uio_seg ni_segflg; /* location of pathname */ |
| 86 | /* |
| 87 | * Arguments to lookup. |
| 88 | */ |
| 89 | struct vnode *ni_startdir; /* starting directory */ |
| 90 | struct vnode *ni_rootdir; /* logical root directory */ |
| 91 | struct vnode *ni_topdir; /* logical top directory */ |
| 92 | /* |
| 93 | * Results: returned from/manipulated by lookup |
| 94 | */ |
| 95 | struct vnode *ni_vp; /* vnode of result */ |
| 96 | struct vnode *ni_dvp; /* vnode of intermediate directory */ |
| 97 | struct namecache *ni_ncp; /* namecache of result */ |
| 98 | struct namecache *ni_dncp; /* namecache of intermediate dir */ |
| 99 | /* |
| 100 | * Shared between namei and lookup/commit routines. |
| 101 | */ |
| 102 | size_t ni_pathlen; /* remaining chars in path incl \0 */ |
| 103 | char *ni_next; /* next location in pathname */ |
| 104 | u_long ni_loopcnt; /* count of symlinks encountered */ |
| 105 | /* |
| 106 | * Lookup parameters: this structure describes the subset of |
| 107 | * information from the nameidata structure that is passed |
| 108 | * through the VOP interface. |
| 109 | */ |
| 110 | struct componentname ni_cnd; |
| 111 | }; |
| 112 | |
| 113 | #ifdef _KERNEL |
| 114 | /* |
| 115 | * namei operations |
| 116 | */ |
| 117 | #define NAMEI_LOOKUP 0 /* perform name lookup only */ |
| 118 | #define NAMEI_CREATE 1 /* setup for file creation */ |
| 119 | #define NAMEI_DELETE 2 /* setup for file deletion */ |
| 120 | #define NAMEI_RENAME 3 /* setup for file renaming */ |
| 121 | #define NAMEI_OPMASK 3 /* mask for operation */ |
| 122 | /* |
| 123 | * namei operational modifier flags, stored in ni_cnd.flags |
| 124 | */ |
| 125 | #define CNP_LOCKLEAF 0x00000004 /* return target vnode locked */ |
| 126 | #define CNP_LOCKPARENT 0x00000008 /* return parent vnode locked */ |
| 127 | #define CNP_WANTPARENT 0x00000010 /* return parent vnode unlocked */ |
| 128 | #define CNP_NOCACHE 0x00000020 /* name must not be left in cache */ |
| 129 | #define CNP_FOLLOW 0x00000040 /* follow symbolic links */ |
| 130 | #define CNP_NOOBJ 0x00000080 /* don't create object */ |
| 131 | #define CNP_WANTDNCP 0x00400000 /* return target namecache refd */ |
| 132 | #define CNP_WANTNCP 0x00800000 /* return target namecache refd */ |
| 133 | #define CNP_MODMASK 0x00c000fc /* mask of operational modifiers */ |
| 134 | /* |
| 135 | * Namei parameter descriptors. |
| 136 | * |
| 137 | * SAVENAME may be set by either the callers of namei or by VOP_LOOKUP. |
| 138 | * If the caller of namei sets the flag (for example execve wants to |
| 139 | * know the name of the program that is being executed), then it must |
| 140 | * free the buffer. If VOP_LOOKUP sets the flag, then the buffer must |
| 141 | * be freed by either the commit routine or the VOP_ABORT routine. |
| 142 | * SAVESTART is set only by the callers of namei. It implies SAVENAME |
| 143 | * plus the addition of saving the parent directory that contains the |
| 144 | * name in ni_startdir. It allows repeated calls to lookup for the |
| 145 | * name being sought. The caller is responsible for releasing the |
| 146 | * buffer and for vrele'ing ni_startdir. |
| 147 | */ |
| 148 | #define CNP_NOCROSSMOUNT 0x00000100 /* do not cross mount points */ |
| 149 | #define CNP_RDONLY 0x00000200 /* lookup with read-only semantics */ |
| 150 | #define CNP_HASBUF 0x00000400 /* has allocated pathname buffer */ |
| 151 | #define CNP_SAVENAME 0x00000800 /* save pathname buffer */ |
| 152 | #define CNP_SAVESTART 0x00001000 /* save starting directory */ |
| 153 | #define CNP_ISDOTDOT 0x00002000 /* current component name is .. */ |
| 154 | #define CNP_MAKEENTRY 0x00004000 /* entry will be added to name cache */ |
| 155 | #define CNP_ISLASTCN 0x00008000 /* flag last component of pathname */ |
| 156 | #define CNP_ISSYMLINK 0x00010000 /* symlink needs interpretation */ |
| 157 | #define CNP_ISWHITEOUT 0x00020000 /* found whiteout */ |
| 158 | #define CNP_DOWHITEOUT 0x00040000 /* do whiteouts */ |
| 159 | #define CNP_WILLBEDIR 0x00080000 /* will be dir, allow trailing / */ |
| 160 | #define CNP_ISUNICODE 0x00100000 /* current component name is unicode*/ |
| 161 | #define CNP_PDIRUNLOCK 0x00200000 /* fs lookup() unlocked parent dir */ |
| 162 | /* (WANTDNCP) 0x00400000 */ |
| 163 | /* (WANTNCP) 0x00800000 */ |
| 164 | #define CNP_CACHETIMEOUT 0x01000000 /* apply timeout to cache entry */ |
| 165 | #define CNP_PARAMASK 0x011fff00 /* mask of parameter descriptors */ |
| 166 | |
| 167 | /* |
| 168 | * Initialization of an nameidata structure. |
| 169 | */ |
| 170 | |
| 171 | static __inline void |
| 172 | _NDINIT(struct nameidata *ndp, u_long op, u_long flags, enum uio_seg segflg, |
| 173 | const char *namep, struct thread *td |
| 174 | ) { |
| 175 | ndp->ni_cnd.cn_nameiop = op; |
| 176 | ndp->ni_cnd.cn_flags = flags; |
| 177 | ndp->ni_segflg = segflg; |
| 178 | ndp->ni_dirp = namep; |
| 179 | ndp->ni_cnd.cn_td = td; |
| 180 | } |
| 181 | |
| 182 | static __inline void |
| 183 | NDINIT(struct nameidata *ndp, u_long op, u_long flags, enum uio_seg segflg, |
| 184 | const char *namep, struct thread *td |
| 185 | ) { |
| 186 | struct proc *p; |
| 187 | |
| 188 | _NDINIT(ndp, op, flags, segflg, namep, td); |
| 189 | p = td->td_proc; |
| 190 | KKASSERT(p != NULL); |
| 191 | ndp->ni_cnd.cn_cred = p->p_ucred; |
| 192 | } |
| 193 | |
| 194 | static __inline void |
| 195 | NDINIT2(struct nameidata *ndp, u_long op, u_long flags, enum uio_seg segflg, |
| 196 | const char *namep, struct thread *td, struct ucred *cr |
| 197 | ) { |
| 198 | _NDINIT(ndp, op, flags, segflg, namep, td); |
| 199 | ndp->ni_cnd.cn_cred = cr; |
| 200 | } |
| 201 | |
| 202 | #define NDF_NO_DVP_RELE 0x00000001 |
| 203 | #define NDF_NO_DVP_UNLOCK 0x00000002 |
| 204 | #define NDF_NO_DVP_PUT 0x00000003 |
| 205 | #define NDF_NO_VP_RELE 0x00000004 |
| 206 | #define NDF_NO_VP_UNLOCK 0x00000008 |
| 207 | #define NDF_NO_VP_PUT (NDF_NO_VP_RELE|NDF_NO_VP_UNLOCK) |
| 208 | #define NDF_NO_STARTDIR_RELE 0x00000010 |
| 209 | #define NDF_NO_FREE_PNBUF 0x00000020 |
| 210 | #define NDF_NO_DNCP_RELE 0x00000040 |
| 211 | #define NDF_NO_NCP_RELE 0x00000080 |
| 212 | |
| 213 | #define NDF_ONLY_PNBUF (~NDF_NO_FREE_PNBUF) |
| 214 | #define NDF_ONLY_PNBUF_AND_NCPS (~(NDF_NO_FREE_PNBUF|NDF_NO_DNCP_RELE|NDF_NO_NCP_RELE)) |
| 215 | |
| 216 | void NDFREE (struct nameidata *, const uint); |
| 217 | |
| 218 | int namei (struct nameidata *ndp); |
| 219 | int lookup (struct nameidata *ndp); |
| 220 | int relookup (struct vnode *dvp, struct vnode **vpp, |
| 221 | struct componentname *cnp); |
| 222 | #endif |
| 223 | |
| 224 | #endif /* !_SYS_NAMEI_H_ */ |