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29 * @(#)namei.h 8.5 (Berkeley) 1/9/95
36 #include <sys/caprights.h>
37 #include <sys/filedesc.h>
38 #include <sys/queue.h>
41 struct componentname {
43 * Arguments to lookup.
45 u_long cn_nameiop; /* namei operation */
46 u_int64_t cn_flags; /* flags to namei */
47 struct thread *cn_thread;/* thread requesting lookup */
48 struct ucred *cn_cred; /* credentials */
49 int cn_lkflags; /* Lock flags LK_EXCLUSIVE or LK_SHARED */
51 * Shared between lookup and commit routines.
53 char *cn_pnbuf; /* pathname buffer */
54 char *cn_nameptr; /* pointer to looked up name */
55 long cn_namelen; /* length of looked up component */
56 long cn_consume; /* chars to consume in lookup() */
60 * Encapsulation of namei parameters.
64 * Arguments to namei/lookup.
66 const char *ni_dirp; /* pathname pointer */
67 enum uio_seg ni_segflg; /* location of pathname */
68 cap_rights_t ni_rightsneeded; /* rights required to look up vnode */
70 * Arguments to lookup.
72 struct vnode *ni_startdir; /* starting directory */
73 struct vnode *ni_rootdir; /* logical root directory */
74 struct vnode *ni_topdir; /* logical top directory */
75 int ni_dirfd; /* starting directory for *at functions */
76 int ni_strictrelative; /* relative lookup only; no '..' */
78 * Results: returned from namei
80 struct filecaps ni_filecaps; /* rights the *at base has */
82 * Results: returned from/manipulated by lookup
84 struct vnode *ni_vp; /* vnode of result */
85 struct vnode *ni_dvp; /* vnode of intermediate directory */
87 * Shared between namei and lookup/commit routines.
89 size_t ni_pathlen; /* remaining chars in path */
90 char *ni_next; /* next location in pathname */
91 u_int ni_loopcnt; /* count of symlinks encountered */
93 * Lookup parameters: this structure describes the subset of
94 * information from the nameidata structure that is passed
95 * through the VOP interface.
97 struct componentname ni_cnd;
104 #define LOOKUP 0 /* perform name lookup only */
105 #define CREATE 1 /* setup for file creation */
106 #define DELETE 2 /* setup for file deletion */
107 #define RENAME 3 /* setup for file renaming */
108 #define OPMASK 3 /* mask for operation */
110 * namei operational modifier flags, stored in ni_cnd.flags
112 #define LOCKLEAF 0x0004 /* lock vnode on return */
113 #define LOCKPARENT 0x0008 /* want parent vnode returned locked */
114 #define WANTPARENT 0x0010 /* want parent vnode returned unlocked */
115 #define NOCACHE 0x0020 /* name must not be left in cache */
116 #define FOLLOW 0x0040 /* follow symbolic links */
117 #define LOCKSHARED 0x0100 /* Shared lock leaf */
118 #define NOFOLLOW 0x0000 /* do not follow symbolic links (pseudo) */
119 #define MODMASK 0x01fc /* mask of operational modifiers */
121 * Namei parameter descriptors.
123 * SAVENAME may be set by either the callers of namei or by VOP_LOOKUP.
124 * If the caller of namei sets the flag (for example execve wants to
125 * know the name of the program that is being executed), then it must
126 * free the buffer. If VOP_LOOKUP sets the flag, then the buffer must
127 * be freed by either the commit routine or the VOP_ABORT routine.
128 * SAVESTART is set only by the callers of namei. It implies SAVENAME
129 * plus the addition of saving the parent directory that contains the
130 * name in ni_startdir. It allows repeated calls to lookup for the
131 * name being sought. The caller is responsible for releasing the
132 * buffer and for vrele'ing ni_startdir.
134 #define RDONLY 0x00000200 /* lookup with read-only semantics */
135 #define HASBUF 0x00000400 /* has allocated pathname buffer */
136 #define SAVENAME 0x00000800 /* save pathname buffer */
137 #define SAVESTART 0x00001000 /* save starting directory */
138 #define ISDOTDOT 0x00002000 /* current component name is .. */
139 #define MAKEENTRY 0x00004000 /* entry is to be added to name cache */
140 #define ISLASTCN 0x00008000 /* this is last component of pathname */
141 #define ISSYMLINK 0x00010000 /* symlink needs interpretation */
142 #define ISWHITEOUT 0x00020000 /* found whiteout */
143 #define DOWHITEOUT 0x00040000 /* do whiteouts */
144 #define WILLBEDIR 0x00080000 /* new files will be dirs; allow trailing / */
145 #define ISUNICODE 0x00100000 /* current component name is unicode*/
146 #define ISOPEN 0x00200000 /* caller is opening; return a real vnode. */
147 #define NOCROSSMOUNT 0x00400000 /* do not cross mount points */
148 #define NOMACCHECK 0x00800000 /* do not perform MAC checks */
149 #define AUDITVNODE1 0x04000000 /* audit the looked up vnode information */
150 #define AUDITVNODE2 0x08000000 /* audit the looked up vnode information */
151 #define TRAILINGSLASH 0x10000000 /* path ended in a slash */
152 #define NOCAPCHECK 0x20000000 /* do not perform capability checks */
153 #define PARAMASK 0x3ffffe00 /* mask of parameter descriptors */
156 * Initialization of a nameidata structure.
158 #define NDINIT(ndp, op, flags, segflg, namep, td) \
159 NDINIT_ALL(ndp, op, flags, segflg, namep, AT_FDCWD, NULL, 0, td)
160 #define NDINIT_AT(ndp, op, flags, segflg, namep, dirfd, td) \
161 NDINIT_ALL(ndp, op, flags, segflg, namep, dirfd, NULL, 0, td)
162 #define NDINIT_ATRIGHTS(ndp, op, flags, segflg, namep, dirfd, rightsp, td) \
163 NDINIT_ALL(ndp, op, flags, segflg, namep, dirfd, NULL, rightsp, td)
164 #define NDINIT_ATVP(ndp, op, flags, segflg, namep, vp, td) \
165 NDINIT_ALL(ndp, op, flags, segflg, namep, AT_FDCWD, vp, 0, td)
167 void NDINIT_ALL(struct nameidata *ndp, u_long op, u_long flags,
168 enum uio_seg segflg, const char *namep, int dirfd, struct vnode *startdir,
169 cap_rights_t *rightsp, struct thread *td);
171 #define NDF_NO_DVP_RELE 0x00000001
172 #define NDF_NO_DVP_UNLOCK 0x00000002
173 #define NDF_NO_DVP_PUT 0x00000003
174 #define NDF_NO_VP_RELE 0x00000004
175 #define NDF_NO_VP_UNLOCK 0x00000008
176 #define NDF_NO_VP_PUT 0x0000000c
177 #define NDF_NO_STARTDIR_RELE 0x00000010
178 #define NDF_NO_FREE_PNBUF 0x00000020
179 #define NDF_ONLY_PNBUF (~NDF_NO_FREE_PNBUF)
181 void NDFREE(struct nameidata *, const u_int);
183 int namei(struct nameidata *ndp);
184 int lookup(struct nameidata *ndp);
185 int relookup(struct vnode *dvp, struct vnode **vpp,
186 struct componentname *cnp);
190 * Stats on usefulness of namei caches.
193 long ncs_goodhits; /* hits that we can really use */
194 long ncs_neghits; /* negative hits that we can use */
195 long ncs_badhits; /* hits we must drop */
196 long ncs_falsehits; /* hits with id mismatch */
197 long ncs_miss; /* misses */
198 long ncs_long; /* long names that ignore cache */
199 long ncs_pass2; /* names found with passes == 2 */
200 long ncs_2passes; /* number of times we attempt it */
203 extern struct nchstats nchstats;
205 #endif /* !_SYS_NAMEI_H_ */