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Annotation of 43BSDTahoe/sys/h/namei.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)namei.h     7.2 (Berkeley) 1/5/88
        !             7:  */
        !             8: 
        !             9: #ifndef _NAMEI_
        !            10: #define        _NAMEI_
        !            11: 
        !            12: #ifdef KERNEL
        !            13: #include "uio.h"
        !            14: #else
        !            15: #include <sys/uio.h>
        !            16: #endif
        !            17: 
        !            18: /*
        !            19:  * Encapsulation of namei parameters.
        !            20:  * One of these is located in the u. area to
        !            21:  * minimize space allocated on the kernel stack.
        !            22:  */
        !            23: struct nameidata {
        !            24:        caddr_t ni_dirp;                /* pathname pointer */
        !            25:        short   ni_nameiop;             /* see below */
        !            26:        short   ni_error;               /* error return if any */
        !            27:        off_t   ni_endoff;              /* end of useful stuff in directory */
        !            28:        struct  inode *ni_pdir;         /* inode of parent directory of dirp */
        !            29:        struct  iovec ni_iovec;         /* MUST be pointed to by ni_iov */
        !            30:        struct  uio ni_uio;             /* directory I/O parameters */
        !            31:        struct  direct ni_dent;         /* current directory entry */
        !            32: };
        !            33: 
        !            34: #define        ni_base         ni_iovec.iov_base
        !            35: #define        ni_count        ni_iovec.iov_len
        !            36: #define        ni_iov          ni_uio.uio_iov
        !            37: #define        ni_iovcnt       ni_uio.uio_iovcnt
        !            38: #define        ni_offset       ni_uio.uio_offset
        !            39: #define        ni_segflg       ni_uio.uio_segflg
        !            40: #define        ni_resid        ni_uio.uio_resid
        !            41: 
        !            42: #ifdef KERNEL
        !            43: /*
        !            44:  * namei operations and modifiers
        !            45:  */
        !            46: #define        LOOKUP          0       /* perform name lookup only */
        !            47: #define        CREATE          1       /* setup for file creation */
        !            48: #define        DELETE          2       /* setup for file deletion */
        !            49: #define        LOCKPARENT      0x10    /* see the top of namei */
        !            50: #define NOCACHE                0x20    /* name must not be left in cache */
        !            51: #define FOLLOW         0x40    /* follow symbolic links */
        !            52: #define        NOFOLLOW        0x0     /* don't follow symbolic links (pseudo) */
        !            53: #endif
        !            54: 
        !            55: /*
        !            56:  * This structure describes the elements in the cache of recent
        !            57:  * names looked up by namei.
        !            58:  */
        !            59: struct namecache {
        !            60:        struct  namecache *nc_forw;     /* hash chain, MUST BE FIRST */
        !            61:        struct  namecache *nc_back;     /* hash chain, MUST BE FIRST */
        !            62:        struct  namecache *nc_nxt;      /* LRU chain */
        !            63:        struct  namecache **nc_prev;    /* LRU chain */
        !            64:        struct  inode *nc_ip;           /* inode the name refers to */
        !            65:        ino_t   nc_ino;                 /* ino of parent of name */
        !            66:        dev_t   nc_dev;                 /* dev of parent of name */
        !            67:        dev_t   nc_idev;                /* dev of the name ref'd */
        !            68:        long    nc_id;                  /* referenced inode's id */
        !            69:        char    nc_nlen;                /* length of name */
        !            70: #define        NCHNAMLEN       15      /* maximum name segment length we bother with */
        !            71:        char    nc_name[NCHNAMLEN];     /* segment name */
        !            72: };
        !            73: #ifdef KERNEL
        !            74: struct namecache *namecache;
        !            75: int    nchsize;
        !            76: #endif
        !            77: 
        !            78: /*
        !            79:  * Stats on usefulness of namei caches.
        !            80:  */
        !            81: struct nchstats {
        !            82:        long    ncs_goodhits;           /* hits that we can reall use */
        !            83:        long    ncs_badhits;            /* hits we must drop */
        !            84:        long    ncs_falsehits;          /* hits with id mismatch */
        !            85:        long    ncs_miss;               /* misses */
        !            86:        long    ncs_long;               /* long names that ignore cache */
        !            87:        long    ncs_pass2;              /* names found with passes == 2 */
        !            88:        long    ncs_2passes;            /* number of times we attempt it */
        !            89: };
        !            90: #endif

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