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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 1.14 2004/09/28 00:25:31 dillon Exp $
41 #include <sys/queue.h>
45 #ifndef _SYS_THREAD_H_
46 #include <sys/thread.h>
53 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
54 #ifndef _SYS_NCHSTATS_H_
55 #include <sys/nchstats.h>
59 struct componentname {
61 * Arguments to lookup.
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 */
68 * Shared between lookup and commit routines.
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 */
78 * Encapsulation of namei parameters.
82 * Arguments to namei/lookup.
84 const char *ni_dirp; /* pathname pointer */
85 enum uio_seg ni_segflg; /* location of pathname */
87 * Arguments to lookup.
89 struct vnode *ni_startdir; /* starting directory */
90 struct vnode *ni_rootdir; /* logical root directory */
91 struct vnode *ni_topdir; /* logical top directory */
93 * Results: returned from/manipulated by lookup
95 struct vnode *ni_vp; /* vnode of result */
96 struct vnode *ni_dvp; /* vnode of intermediate directory */
98 * Shared between namei and lookup/commit routines.
100 size_t ni_pathlen; /* remaining chars in path incl \0 */
101 char *ni_next; /* next location in pathname */
102 u_long ni_loopcnt; /* count of symlinks encountered */
104 * Lookup parameters: this structure describes the subset of
105 * information from the nameidata structure that is passed
106 * through the VOP interface.
108 struct componentname ni_cnd;
115 #define NAMEI_LOOKUP 0 /* perform name lookup only */
116 #define NAMEI_CREATE 1 /* setup for file creation */
117 #define NAMEI_DELETE 2 /* setup for file deletion */
118 #define NAMEI_RENAME 3 /* setup for file renaming */
119 #define NAMEI_OPMASK 3 /* mask for operation */
121 * namei operational modifier flags, stored in ni_cnd.flags
123 #define CNP_LOCKLEAF 0x00000004 /* return target vnode locked */
124 #define CNP_LOCKPARENT 0x00000008 /* return parent vnode locked */
125 #define CNP_WANTPARENT 0x00000010 /* return parent vnode unlocked */
126 #define CNP_NOCACHE 0x00000020 /* name must not be left in cache */
127 #define CNP_FOLLOW 0x00000040 /* follow symbolic links */
128 #define CNP_NOOBJ 0x00000080 /* don't create object */
129 #define CNP_MODMASK 0x00c000fc /* mask of operational modifiers */
131 * Namei parameter descriptors.
133 * SAVENAME may be set by either the callers of namei or by VOP_LOOKUP.
134 * If the caller of namei sets the flag (for example execve wants to
135 * know the name of the program that is being executed), then it must
136 * free the buffer. If VOP_LOOKUP sets the flag, then the buffer must
137 * be freed by either the commit routine or the VOP_ABORT routine.
138 * SAVESTART is set only by the callers of namei. It implies SAVENAME
139 * plus the addition of saving the parent directory that contains the
140 * name in ni_startdir. It allows repeated calls to lookup for the
141 * name being sought. The caller is responsible for releasing the
142 * buffer and for vrele'ing ni_startdir.
144 #define CNP_NOCROSSMOUNT 0x00000100 /* do not cross mount points */
145 #define CNP_RDONLY 0x00000200 /* lookup with read-only semantics */
146 #define CNP_HASBUF 0x00000400 /* has allocated pathname buffer */
147 #define CNP_SAVENAME 0x00000800 /* save pathname buffer */
148 #define CNP_SAVESTART 0x00001000 /* save starting directory */
149 #define CNP_ISDOTDOT 0x00002000 /* current component name is .. */
150 #define CNP_MAKEENTRY 0x00004000 /* entry will be added to name cache */
151 #define CNP_ISLASTCN 0x00008000 /* flag last component of pathname */
152 #define CNP_ISSYMLINK 0x00010000 /* symlink needs interpretation */
153 #define CNP_ISWHITEOUT 0x00020000 /* found whiteout */
154 #define CNP_DOWHITEOUT 0x00040000 /* do whiteouts */
155 #define CNP_WILLBEDIR 0x00080000 /* will be dir, allow trailing / */
156 #define CNP_ISUNICODE 0x00100000 /* current component name is unicode*/
157 #define CNP_PDIRUNLOCK 0x00200000 /* fs lookup() unlocked parent dir */
158 /* (WANTDNCP) 0x00400000 */
159 /* (WANTNCP) 0x00800000 */
160 #define CNP_CACHETIMEOUT 0x01000000 /* apply timeout to cache entry */
161 #define CNP_PARAMASK 0x011fff00 /* mask of parameter descriptors */
164 * Initialization of an nameidata structure.
168 _NDINIT(struct nameidata *ndp, u_long op, u_long flags, enum uio_seg segflg,
169 const char *namep, struct thread *td
171 ndp->ni_cnd.cn_nameiop = op;
172 ndp->ni_cnd.cn_flags = flags;
173 ndp->ni_segflg = segflg;
174 ndp->ni_dirp = namep;
175 ndp->ni_cnd.cn_td = td;
179 NDINIT(struct nameidata *ndp, u_long op, u_long flags, enum uio_seg segflg,
180 const char *namep, struct thread *td
184 _NDINIT(ndp, op, flags, segflg, namep, td);
187 ndp->ni_cnd.cn_cred = p->p_ucred;
191 NDINIT2(struct nameidata *ndp, u_long op, u_long flags, enum uio_seg segflg,
192 const char *namep, struct thread *td, struct ucred *cr
194 _NDINIT(ndp, op, flags, segflg, namep, td);
195 ndp->ni_cnd.cn_cred = cr;
198 #define NDF_NO_DVP_RELE 0x00000001
199 #define NDF_NO_DVP_UNLOCK 0x00000002
200 #define NDF_NO_DVP_PUT 0x00000003
201 #define NDF_NO_VP_RELE 0x00000004
202 #define NDF_NO_VP_UNLOCK 0x00000008
203 #define NDF_NO_VP_PUT (NDF_NO_VP_RELE|NDF_NO_VP_UNLOCK)
204 #define NDF_NO_STARTDIR_RELE 0x00000010
205 #define NDF_NO_FREE_PNBUF 0x00000020
207 #define NDF_ONLY_PNBUF (~NDF_NO_FREE_PNBUF)
208 #define NDF_ONLY_PNBUF_AND_NCPS (~(NDF_NO_FREE_PNBUF|NDF_NO_DNCP_RELE|NDF_NO_NCP_RELE))
210 void NDFREE (struct nameidata *, const uint);
212 extern int varsym_enable;
214 int namei (struct nameidata *ndp);
215 int lookup (struct nameidata *ndp);
216 int relookup (struct vnode *dvp, struct vnode **vpp,
217 struct componentname *cnp);
220 #endif /* !_SYS_NAMEI_H_ */