hpfs_hash.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
    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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
   34  * $FreeBSD: releng/5.0/sys/fs/hpfs/hpfs_hash.c 93818 2002-04-04 21:03:38Z jhb $
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/vnode.h>
   42 #include <sys/mount.h>
   43 #include <sys/malloc.h>
   44 #include <sys/proc.h>
   45 #include <sys/mutex.h>
   46 
   47 #include <fs/hpfs/hpfs.h>
   48 
   49 MALLOC_DEFINE(M_HPFSHASH, "HPFS hash", "HPFS node hash tables");
   50 
   51 /*
   52  * Structures associated with hpfsnode cacheing.
   53  */
   54 static LIST_HEAD(hphashhead, hpfsnode) *hpfs_hphashtbl;
   55 static u_long   hpfs_hphash;            /* size of hash table - 1 */
   56 #define HPNOHASH(dev, lsn)      (&hpfs_hphashtbl[(minor(dev) + (lsn)) & hpfs_hphash])
   57 static struct mtx hpfs_hphash_mtx;
   58 struct lock hpfs_hphash_lock;
   59 
   60 /*
   61  * Initialize inode hash table.
   62  */
   63 void
   64 hpfs_hphashinit()
   65 {
   66 
   67         lockinit (&hpfs_hphash_lock, PINOD, "hpfs_hphashlock", 0, 0);
   68         hpfs_hphashtbl = hashinit(desiredvnodes, M_HPFSHASH, &hpfs_hphash);
   69         mtx_init(&hpfs_hphash_mtx, "hpfs hphash", NULL, MTX_DEF);
   70 }
   71 
   72 /*
   73  * Destroy inode hash table.
   74  */
   75 void
   76 hpfs_hphashdestroy(void)
   77 {
   78 
   79         lockdestroy(&hpfs_hphash_lock);
   80         mtx_destroy(&hpfs_hphash_mtx);
   81 }
   82 
   83 /*
   84  * Use the device/inum pair to find the incore inode, and return a pointer
   85  * to it. If it is in core, return it, even if it is locked.
   86  */
   87 struct hpfsnode *
   88 hpfs_hphashlookup(dev, ino)
   89         dev_t dev;
   90         lsn_t ino;
   91 {
   92         struct hpfsnode *hp;
   93 
   94         mtx_lock(&hpfs_hphash_mtx);
   95         LIST_FOREACH(hp, HPNOHASH(dev, ino), h_hash)
   96                 if (ino == hp->h_no && dev == hp->h_dev)
   97                         break;
   98         mtx_unlock(&hpfs_hphash_mtx);
   99 
  100         return (hp);
  101 }
  102 
  103 #if 0
  104 struct hpfsnode *
  105 hpfs_hphashget(dev, ino)
  106         dev_t dev;
  107         lsn_t ino;
  108 {
  109         struct hpfsnode *hp;
  110 
  111 loop:
  112         mtx_lock(&hpfs_hphash_mtx);
  113         LIST_FOREACH(hp, HPNOHASH(dev, ino), h_hash) {
  114                 if (ino == hp->h_no && dev == hp->h_dev) {
  115                         lockmgr(&hp->h_intlock, LK_EXCLUSIVE | LK_INTERLOCK,
  116                             &hpfs_hphash_slock, NULL);
  117                         return (hp);
  118                 }
  119         }
  120         mtx_unlock(&hpfs_hphash_mtx);
  121         return (hp);
  122 }
  123 #endif
  124 
  125 int
  126 hpfs_hphashvget(dev, ino, flags, vpp, td)
  127         dev_t dev;
  128         lsn_t ino;
  129         int flags;
  130         struct vnode **vpp;
  131         struct thread *td;
  132 {
  133         struct hpfsnode *hp;
  134         struct vnode *vp;
  135         int error;
  136 
  137         *vpp = NULLVP;
  138 loop:
  139         mtx_lock(&hpfs_hphash_mtx);
  140         LIST_FOREACH(hp, HPNOHASH(dev, ino), h_hash) {
  141                 if (ino == hp->h_no && dev == hp->h_dev) {
  142                         vp = HPTOV(hp);
  143                         mtx_lock(&vp->v_interlock);
  144                         mtx_unlock(&hpfs_hphash_mtx);
  145                         error = vget(vp, flags | LK_INTERLOCK, td);
  146                         if (error == ENOENT)
  147                                 goto loop;
  148                         if (error)
  149                                 return (error);
  150                         *vpp = vp;
  151                         return (0);
  152                 }
  153         }
  154         mtx_unlock(&hpfs_hphash_mtx);
  155         return (0);
  156 }
  157 
  158 /*
  159  * Insert the hpfsnode into the hash table.
  160  */
  161 void
  162 hpfs_hphashins(hp)
  163         struct hpfsnode *hp;
  164 {
  165         struct hphashhead *hpp;
  166 
  167         mtx_lock(&hpfs_hphash_mtx);
  168         hpp = HPNOHASH(hp->h_dev, hp->h_no);
  169         hp->h_flag |= H_HASHED;
  170         LIST_INSERT_HEAD(hpp, hp, h_hash);
  171         mtx_unlock(&hpfs_hphash_mtx);
  172 }
  173 
  174 /*
  175  * Remove the inode from the hash table.
  176  */
  177 void
  178 hpfs_hphashrem(hp)
  179         struct hpfsnode *hp;
  180 {
  181         mtx_lock(&hpfs_hphash_mtx);
  182         if (hp->h_flag & H_HASHED) {
  183                 hp->h_flag &= ~H_HASHED;
  184                 LIST_REMOVE(hp, h_hash);
  185         }
  186         mtx_unlock(&hpfs_hphash_mtx);
  187 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/hpfs/hpfs_hash.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/hpfs_hash.c