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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 1.6 2003/09/23 05:03:52 dillon Exp $
41 #include <sys/queue.h>
45 #ifndef _SYS_THREAD_H_
46 #include <sys/thread.h>
53 struct componentname {
55 * Arguments to lookup.
57 u_long cn_nameiop; /* namei operation */
58 u_long cn_flags; /* flags to namei */
59 struct thread *cn_td; /* process requesting lookup */
60 struct ucred *cn_cred; /* credentials */
62 * Shared between lookup and commit routines.
64 char *cn_pnbuf; /* pathname buffer */
65 char *cn_nameptr; /* pointer to looked up name */
66 long cn_namelen; /* length of looked up component */
67 long cn_consume; /* chars to consume in lookup() */
71 * Encapsulation of namei parameters.
75 * Arguments to namei/lookup.
77 const char *ni_dirp; /* pathname pointer */
78 enum uio_seg ni_segflg; /* location of pathname */
80 * Arguments to lookup.
82 struct vnode *ni_startdir; /* starting directory */
83 struct vnode *ni_rootdir; /* logical root directory */
84 struct vnode *ni_topdir; /* logical top directory */
86 * Results: returned from/manipulated by lookup
88 struct vnode *ni_vp; /* vnode of result */
89 struct vnode *ni_dvp; /* vnode of intermediate directory */
91 * Shared between namei and lookup/commit routines.
93 size_t ni_pathlen; /* remaining chars in path incl \0 */
94 char *ni_next; /* next location in pathname */
95 u_long ni_loopcnt; /* count of symlinks encountered */
97 * Lookup parameters: this structure describes the subset of
98 * information from the nameidata structure that is passed
99 * through the VOP interface.
101 struct componentname ni_cnd;
108 #define NAMEI_LOOKUP 0 /* perform name lookup only */
109 #define NAMEI_CREATE 1 /* setup for file creation */
110 #define NAMEI_DELETE 2 /* setup for file deletion */
111 #define NAMEI_RENAME 3 /* setup for file renaming */
112 #define NAMEI_OPMASK 3 /* mask for operation */
114 * namei operational modifier flags, stored in ni_cnd.flags
116 #define CNP_LOCKLEAF 0x00000004 /* return target vnode locked */
117 #define CNP_LOCKPARENT 0x00000008 /* return parent vnode locked */
118 #define CNP_WANTPARENT 0x00000010 /* return parent vnode unlocked */
119 #define CNP_NOCACHE 0x00000020 /* name must not be left in cache */
120 #define CNP_FOLLOW 0x00000040 /* follow symbolic links */
121 #define CNP_NOOBJ 0x00000080 /* don't create object */
122 #define CNP_NOFOLLOW 0x00000000 /* do not follow symlinks (pseudo) */
123 #define CNP_MODMASK 0x000000fc /* mask of operational modifiers */
125 * Namei parameter descriptors.
127 * SAVENAME may be set by either the callers of namei or by VOP_LOOKUP.
128 * If the caller of namei sets the flag (for example execve wants to
129 * know the name of the program that is being executed), then it must
130 * free the buffer. If VOP_LOOKUP sets the flag, then the buffer must
131 * be freed by either the commit routine or the VOP_ABORT routine.
132 * SAVESTART is set only by the callers of namei. It implies SAVENAME
133 * plus the addition of saving the parent directory that contains the
134 * name in ni_startdir. It allows repeated calls to lookup for the
135 * name being sought. The caller is responsible for releasing the
136 * buffer and for vrele'ing ni_startdir.
138 #define CNP_NOCROSSMOUNT 0x00000100 /* do not cross mount points */
139 #define CNP_RDONLY 0x00000200 /* lookup with read-only semantics */
140 #define CNP_HASBUF 0x00000400 /* has allocated pathname buffer */
141 #define CNP_SAVENAME 0x00000800 /* save pathname buffer */
142 #define CNP_SAVESTART 0x00001000 /* save starting directory */
143 #define CNP_ISDOTDOT 0x00002000 /* current component name is .. */
144 #define CNP_MAKEENTRY 0x00004000 /* entry will be added to name cache */
145 #define CNP_ISLASTCN 0x00008000 /* flag last component of pathname */
146 #define CNP_ISSYMLINK 0x00010000 /* symlink needs interpretation */
147 #define CNP_ISWHITEOUT 0x00020000 /* found whiteout */
148 #define CNP_DOWHITEOUT 0x00040000 /* do whiteouts */
149 #define CNP_WILLBEDIR 0x00080000 /* will be dir, allow trailing / */
150 #define CNP_ISUNICODE 0x00100000 /* current component name is unicode*/
151 #define CNP_PDIRUNLOCK 0x00200000 /* fs lookup() unlocked parent dir */
152 #define CNP_PARAMASK 0x001fff00 /* mask of parameter descriptors */
154 * Initialization of an nameidata structure.
156 static void NDINIT (struct nameidata *, u_long, u_long, enum uio_seg,
157 const char *, struct thread *);
159 NDINIT(struct nameidata *ndp,
160 u_long op, u_long flags,
165 struct proc *p = td->td_proc;
168 ndp->ni_cnd.cn_nameiop = op;
169 ndp->ni_cnd.cn_flags = flags;
170 ndp->ni_segflg = segflg;
171 ndp->ni_dirp = namep;
172 ndp->ni_cnd.cn_td = td;
173 ndp->ni_cnd.cn_cred = p->p_ucred;
176 #define NDF_NO_DVP_RELE 0x00000001
177 #define NDF_NO_DVP_UNLOCK 0x00000002
178 #define NDF_NO_DVP_PUT 0x00000003
179 #define NDF_NO_VP_RELE 0x00000004
180 #define NDF_NO_VP_UNLOCK 0x00000008
181 #define NDF_NO_VP_PUT 0x0000000c
182 #define NDF_NO_STARTDIR_RELE 0x00000010
183 #define NDF_NO_FREE_PNBUF 0x00000020
184 #define NDF_ONLY_PNBUF (~NDF_NO_FREE_PNBUF)
186 void NDFREE (struct nameidata *, const uint);
188 int namei (struct nameidata *ndp);
189 int lookup (struct nameidata *ndp);
190 int relookup (struct vnode *dvp, struct vnode **vpp,
191 struct componentname *cnp);
195 * Stats on usefulness of namei caches.
198 long ncs_goodhits; /* hits that we can really use */
199 long ncs_neghits; /* negative hits that we can use */
200 long ncs_badhits; /* hits we must drop */
201 long ncs_falsehits; /* hits with id mismatch */
202 long ncs_miss; /* misses */
203 long ncs_long; /* long names that ignore cache */
204 long ncs_pass2; /* names found with passes == 2 */
205 long ncs_2passes; /* number of times we attempt it */
208 extern struct nchstats nchstats;
210 #endif /* !_SYS_NAMEI_H_ */