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 1.3 2005/12/11 12:24:29 christos 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  * 3. 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  * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.3 2005/12/11 12:24:29 christos Exp $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/vnode.h>
   43 #include <sys/malloc.h>
   44 #include <sys/proc.h>
   45 #include <sys/mount.h>
   46 
   47 #include <fs/ntfs/ntfs.h>
   48 #include <fs/ntfs/ntfs_inode.h>
   49 #include <fs/ntfs/ntfs_ihash.h>
   50 
   51 MALLOC_DEFINE(M_NTFSNTHASH, "NTFS nthash", "NTFS ntnode hash tables");
   52 
   53 /*
   54  * Structures associated with inode cacheing.
   55  */
   56 static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
   57 static u_long   ntfs_nthash;            /* size of hash table - 1 */
   58 #define NTNOHASH(device, inum)  ((minor(device) + (inum)) & ntfs_nthash)
   59 #ifndef NULL_SIMPLELOCKS
   60 static struct simplelock ntfs_nthash_slock;
   61 #endif
   62 struct lock ntfs_hashlock;
   63 
   64 /*
   65  * Initialize inode hash table.
   66  */
   67 void
   68 ntfs_nthashinit()
   69 {
   70         lockinit(&ntfs_hashlock, PINOD, "ntfs_nthashlock", 0, 0);
   71         ntfs_nthashtbl = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK,
   72             &ntfs_nthash);
   73         simple_lock_init(&ntfs_nthash_slock);
   74 }
   75 
   76 #ifdef __NetBSD__
   77 /*
   78  * Reinitialize inode hash table.
   79  */
   80 
   81 void
   82 ntfs_nthashreinit()
   83 {
   84         struct ntnode *ip;
   85         struct nthashhead *oldhash, *hash;
   86         u_long oldmask, mask, val;
   87         int i;
   88 
   89         hash = HASHINIT(desiredvnodes, M_NTFSNTHASH, M_WAITOK, &mask);
   90 
   91         simple_lock(&ntfs_nthash_slock);
   92         oldhash = ntfs_nthashtbl;
   93         oldmask = ntfs_nthash;
   94         ntfs_nthashtbl = hash;
   95         ntfs_nthash = mask;
   96         for (i = 0; i <= oldmask; i++) {
   97                 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
   98                         LIST_REMOVE(ip, i_hash);
   99                         val = NTNOHASH(ip->i_dev, ip->i_number);
  100                         LIST_INSERT_HEAD(&hash[val], ip, i_hash);
  101                 }
  102         }
  103         simple_unlock(&ntfs_nthash_slock);
  104         hashdone(oldhash, M_NTFSNTHASH);
  105 }
  106 
  107 /*
  108  * Free the inode hash table. Called from ntfs_done(), only needed
  109  * on NetBSD.
  110  */
  111 void
  112 ntfs_nthashdone()
  113 {
  114         hashdone(ntfs_nthashtbl, M_NTFSNTHASH);
  115 }
  116 #endif
  117 
  118 /*
  119  * Use the device/inum pair to find the incore inode, and return a pointer
  120  * to it. If it is in core, return it, even if it is locked.
  121  */
  122 struct ntnode *
  123 ntfs_nthashlookup(dev, inum)
  124         dev_t dev;
  125         ino_t inum;
  126 {
  127         struct ntnode *ip;
  128         struct nthashhead *ipp;
  129 
  130         simple_lock(&ntfs_nthash_slock);
  131         ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
  132         LIST_FOREACH(ip, ipp, i_hash) {
  133                 if (inum == ip->i_number && dev == ip->i_dev)
  134                         break;
  135         }
  136         simple_unlock(&ntfs_nthash_slock);
  137 
  138         return (ip);
  139 }
  140 
  141 /*
  142  * Insert the ntnode into the hash table.
  143  */
  144 void
  145 ntfs_nthashins(ip)
  146         struct ntnode *ip;
  147 {
  148         struct nthashhead *ipp;
  149 
  150         simple_lock(&ntfs_nthash_slock);
  151         ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
  152         LIST_INSERT_HEAD(ipp, ip, i_hash);
  153         ip->i_flag |= IN_HASHED;
  154         simple_unlock(&ntfs_nthash_slock);
  155 }
  156 
  157 /*
  158  * Remove the inode from the hash table.
  159  */
  160 void
  161 ntfs_nthashrem(ip)
  162         struct ntnode *ip;
  163 {
  164         simple_lock(&ntfs_nthash_slock);
  165         if (ip->i_flag & IN_HASHED) {
  166                 ip->i_flag &= ~IN_HASHED;
  167                 LIST_REMOVE(ip, i_hash);
  168         }
  169         simple_unlock(&ntfs_nthash_slock);
  170 }

Cache object: b0993067df5d2e0604e87599e4b7eea1


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