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/fs/ntfs/ntfs_ihash.c

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    1 /*      $NetBSD: ntfs_ihash.c,v 1.5 1999/09/30 16:56:40 jdolecek Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 4. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
   32  * $FreeBSD: releng/9.2/sys/fs/ntfs/ntfs_ihash.c 179726 2008-06-11 18:55:19Z ed $
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/lock.h>
   39 #include <sys/vnode.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mount.h>
   42 #include <sys/mutex.h>
   43 
   44 #include <fs/ntfs/ntfs.h>
   45 #include <fs/ntfs/ntfs_inode.h>
   46 #include <fs/ntfs/ntfs_ihash.h>
   47 
   48 MALLOC_DEFINE(M_NTFSNTHASH, "ntfs_nthash", "NTFS ntnode hash tables");
   49 
   50 /*
   51  * Structures associated with inode cacheing.
   52  */
   53 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
   54 static u_long   ntfs_nthash;            /* size of hash table - 1 */
   55 #define NTNOHASH(inum)  (&ntfs_nthashtbl[(inum) & ntfs_nthash])
   56 static struct mtx ntfs_nthash_mtx;
   57 struct lock ntfs_hashlock;
   58 
   59 /*
   60  * Initialize inode hash table.
   61  */
   62 void
   63 ntfs_nthashinit()
   64 {
   65         lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
   66         ntfs_nthashtbl = hashinit(desiredvnodes, M_NTFSNTHASH, &ntfs_nthash);
   67         mtx_init(&ntfs_nthash_mtx, "ntfs nthash", NULL, MTX_DEF);
   68 }
   69 
   70 /*
   71  * Destroy inode hash table.
   72  */
   73 void
   74 ntfs_nthashdestroy(void)
   75 {
   76         hashdestroy(ntfs_nthashtbl, M_NTFSNTHASH, ntfs_nthash);
   77         lockdestroy(&ntfs_hashlock);
   78         mtx_destroy(&ntfs_nthash_mtx);
   79 }
   80 
   81 /*
   82  * Use the device/inum pair to find the incore inode, and return a pointer
   83  * to it. If it is in core, return it, even if it is locked.
   84  */
   85 struct ntnode *
   86 ntfs_nthashlookup(dev, inum)
   87         struct cdev *dev;
   88         ino_t inum;
   89 {
   90         struct ntnode *ip;
   91 
   92         mtx_lock(&ntfs_nthash_mtx);
   93         LIST_FOREACH(ip, NTNOHASH(inum), i_hash)
   94                 if (inum == ip->i_number && dev == ip->i_dev)
   95                         break;
   96         mtx_unlock(&ntfs_nthash_mtx);
   97 
   98         return (ip);
   99 }
  100 
  101 /*
  102  * Insert the ntnode into the hash table.
  103  */
  104 void
  105 ntfs_nthashins(ip)
  106         struct ntnode *ip;
  107 {
  108         struct nthashhead *ipp;
  109 
  110         mtx_lock(&ntfs_nthash_mtx);
  111         ipp = NTNOHASH(ip->i_number);
  112         LIST_INSERT_HEAD(ipp, ip, i_hash);
  113         ip->i_flag |= IN_HASHED;
  114         mtx_unlock(&ntfs_nthash_mtx);
  115 }
  116 
  117 /*
  118  * Remove the inode from the hash table.
  119  */
  120 void
  121 ntfs_nthashrem(ip)
  122         struct ntnode *ip;
  123 {
  124         mtx_lock(&ntfs_nthash_mtx);
  125         if (ip->i_flag & IN_HASHED) {
  126                 ip->i_flag &= ~IN_HASHED;
  127                 LIST_REMOVE(ip, i_hash);
  128         }
  129         mtx_unlock(&ntfs_nthash_mtx);
  130 }

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