The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/namei.h

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    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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)namei.h     8.5 (Berkeley) 1/9/95
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_NAMEI_H_
   34 #define _SYS_NAMEI_H_
   35 
   36 #include <sys/queue.h>
   37 #include <sys/uio.h>
   38 
   39 struct componentname {
   40         /*
   41          * Arguments to lookup.
   42          */
   43         u_long  cn_nameiop;     /* namei operation */
   44         u_long  cn_flags;       /* flags to namei */
   45         struct  thread *cn_thread;/* thread requesting lookup */
   46         struct  ucred *cn_cred; /* credentials */
   47         int     cn_lkflags;     /* Lock flags LK_EXCLUSIVE or LK_SHARED */
   48         /*
   49          * Shared between lookup and commit routines.
   50          */
   51         char    *cn_pnbuf;      /* pathname buffer */
   52         char    *cn_nameptr;    /* pointer to looked up name */
   53         long    cn_namelen;     /* length of looked up component */
   54         long    cn_consume;     /* chars to consume in lookup() */
   55 };
   56 
   57 /*
   58  * Encapsulation of namei parameters.
   59  */
   60 struct nameidata {
   61         /*
   62          * Arguments to namei/lookup.
   63          */
   64         const   char *ni_dirp;          /* pathname pointer */
   65         enum    uio_seg ni_segflg;      /* location of pathname */
   66         /*
   67          * Arguments to lookup.
   68          */
   69         struct  vnode *ni_startdir;     /* starting directory */
   70         struct  vnode *ni_rootdir;      /* logical root directory */
   71         struct  vnode *ni_topdir;       /* logical top directory */
   72         /*
   73          * Results: returned from/manipulated by lookup
   74          */
   75         struct  vnode *ni_vp;           /* vnode of result */
   76         struct  vnode *ni_dvp;          /* vnode of intermediate directory */
   77         /*
   78          * Shared between namei and lookup/commit routines.
   79          */
   80         size_t  ni_pathlen;             /* remaining chars in path */
   81         char    *ni_next;               /* next location in pathname */
   82         u_long  ni_loopcnt;             /* count of symlinks encountered */
   83         /*
   84          * Lookup parameters: this structure describes the subset of
   85          * information from the nameidata structure that is passed
   86          * through the VOP interface.
   87          */
   88         struct componentname ni_cnd;
   89 };
   90 
   91 #ifdef _KERNEL
   92 /*
   93  * namei operations
   94  */
   95 #define LOOKUP          0       /* perform name lookup only */
   96 #define CREATE          1       /* setup for file creation */
   97 #define DELETE          2       /* setup for file deletion */
   98 #define RENAME          3       /* setup for file renaming */
   99 #define OPMASK          3       /* mask for operation */
  100 /*
  101  * namei operational modifier flags, stored in ni_cnd.flags
  102  */
  103 #define LOCKLEAF        0x0004  /* lock inode on return */
  104 #define LOCKPARENT      0x0008  /* want parent vnode returned locked */
  105 #define WANTPARENT      0x0010  /* want parent vnode returned unlocked */
  106 #define NOCACHE         0x0020  /* name must not be left in cache */
  107 #define FOLLOW          0x0040  /* follow symbolic links */
  108 #define LOCKSHARED      0x0100  /* Shared lock leaf */
  109 #define NOFOLLOW        0x0000  /* do not follow symbolic links (pseudo) */
  110 #define MODMASK         0x01fc  /* mask of operational modifiers */
  111 /*
  112  * Namei parameter descriptors.
  113  *
  114  * SAVENAME may be set by either the callers of namei or by VOP_LOOKUP.
  115  * If the caller of namei sets the flag (for example execve wants to
  116  * know the name of the program that is being executed), then it must
  117  * free the buffer. If VOP_LOOKUP sets the flag, then the buffer must
  118  * be freed by either the commit routine or the VOP_ABORT routine.
  119  * SAVESTART is set only by the callers of namei. It implies SAVENAME
  120  * plus the addition of saving the parent directory that contains the
  121  * name in ni_startdir. It allows repeated calls to lookup for the
  122  * name being sought. The caller is responsible for releasing the
  123  * buffer and for vrele'ing ni_startdir.
  124  */
  125 #define RDONLY          0x0000200 /* lookup with read-only semantics */
  126 #define HASBUF          0x0000400 /* has allocated pathname buffer */
  127 #define SAVENAME        0x0000800 /* save pathname buffer */
  128 #define SAVESTART       0x0001000 /* save starting directory */
  129 #define ISDOTDOT        0x0002000 /* current component name is .. */
  130 #define MAKEENTRY       0x0004000 /* entry is to be added to name cache */
  131 #define ISLASTCN        0x0008000 /* this is last component of pathname */
  132 #define ISSYMLINK       0x0010000 /* symlink needs interpretation */
  133 #define ISWHITEOUT      0x0020000 /* found whiteout */
  134 #define DOWHITEOUT      0x0040000 /* do whiteouts */
  135 #define WILLBEDIR       0x0080000 /* new files will be dirs; allow trailing / */
  136 #define ISUNICODE       0x0100000 /* current component name is unicode*/
  137 #define ISOPEN          0x0200000 /* caller is opening; return a real vnode. */
  138 #define NOCROSSMOUNT    0x0400000 /* do not cross mount points */
  139 #define NOMACCHECK      0x0800000 /* do not perform MAC checks */
  140 #define MPSAFE          0x1000000 /* namei() must acquire Giant if needed. */
  141 #define GIANTHELD       0x2000000 /* namei() is holding giant. */
  142 #define AUDITVNODE1     0x4000000 /* audit the looked up vnode information */
  143 #define AUDITVNODE2     0x8000000 /* audit the looked up vnode information */
  144 #define PARAMASK        0xffffe00 /* mask of parameter descriptors */
  145 
  146 #define NDHASGIANT(NDP) (((NDP)->ni_cnd.cn_flags & GIANTHELD) != 0)
  147 
  148 /*
  149  * Initialization of a nameidata structure.
  150  */
  151 static void NDINIT(struct nameidata *, u_long, u_long, enum uio_seg,
  152             const char *, struct thread *);
  153 static __inline void
  154 NDINIT(struct nameidata *ndp,
  155         u_long op, u_long flags,
  156         enum uio_seg segflg,
  157         const char *namep,
  158         struct thread *td)
  159 {
  160         ndp->ni_cnd.cn_nameiop = op;
  161         ndp->ni_cnd.cn_flags = flags;
  162         ndp->ni_segflg = segflg;
  163         ndp->ni_dirp = namep;
  164         ndp->ni_cnd.cn_thread = td;
  165 }
  166 
  167 #define NDF_NO_DVP_RELE         0x00000001
  168 #define NDF_NO_DVP_UNLOCK       0x00000002
  169 #define NDF_NO_DVP_PUT          0x00000003
  170 #define NDF_NO_VP_RELE          0x00000004
  171 #define NDF_NO_VP_UNLOCK        0x00000008
  172 #define NDF_NO_VP_PUT           0x0000000c
  173 #define NDF_NO_STARTDIR_RELE    0x00000010
  174 #define NDF_NO_FREE_PNBUF       0x00000020
  175 #define NDF_ONLY_PNBUF          (~NDF_NO_FREE_PNBUF)
  176 
  177 void NDFREE(struct nameidata *, const u_int);
  178 
  179 int     namei(struct nameidata *ndp);
  180 int     lookup(struct nameidata *ndp);
  181 int     relookup(struct vnode *dvp, struct vnode **vpp,
  182             struct componentname *cnp);
  183 #endif
  184 
  185 /*
  186  * Stats on usefulness of namei caches.
  187  */
  188 struct nchstats {
  189         long    ncs_goodhits;           /* hits that we can really use */
  190         long    ncs_neghits;            /* negative hits that we can use */
  191         long    ncs_badhits;            /* hits we must drop */
  192         long    ncs_falsehits;          /* hits with id mismatch */
  193         long    ncs_miss;               /* misses */
  194         long    ncs_long;               /* long names that ignore cache */
  195         long    ncs_pass2;              /* names found with passes == 2 */
  196         long    ncs_2passes;            /* number of times we attempt it */
  197 };
  198 
  199 extern struct nchstats nchstats;
  200 
  201 #endif /* !_SYS_NAMEI_H_ */

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