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  * 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  *      @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
   30  * $FreeBSD$
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/vnode.h>
   38 #include <sys/mount.h>
   39 #include <sys/malloc.h>
   40 #include <sys/proc.h>
   41 #include <sys/mutex.h>
   42 
   43 #include <fs/hpfs/hpfs.h>
   44 
   45 MALLOC_DEFINE(M_HPFSHASH, "HPFS hash", "HPFS node hash tables");
   46 
   47 /*
   48  * Structures associated with hpfsnode cacheing.
   49  */
   50 static LIST_HEAD(hphashhead, hpfsnode) *hpfs_hphashtbl;
   51 static u_long   hpfs_hphash;            /* size of hash table - 1 */
   52 #define HPNOHASH(dev, lsn)      (&hpfs_hphashtbl[(minor(dev) + (lsn)) & hpfs_hphash])
   53 static struct mtx hpfs_hphash_mtx;
   54 struct lock hpfs_hphash_lock;
   55 
   56 /*
   57  * Initialize inode hash table.
   58  */
   59 void
   60 hpfs_hphashinit()
   61 {
   62 
   63         lockinit (&hpfs_hphash_lock, PINOD, "hpfs_hphashlock", 0, 0);
   64         hpfs_hphashtbl = hashinit(desiredvnodes, M_HPFSHASH, &hpfs_hphash);
   65         mtx_init(&hpfs_hphash_mtx, "hpfs hphash", NULL, MTX_DEF);
   66 }
   67 
   68 /*
   69  * Destroy inode hash table.
   70  */
   71 void
   72 hpfs_hphashdestroy(void)
   73 {
   74 
   75         lockdestroy(&hpfs_hphash_lock);
   76         mtx_destroy(&hpfs_hphash_mtx);
   77 }
   78 
   79 /*
   80  * Use the device/inum pair to find the incore inode, and return a pointer
   81  * to it. If it is in core, return it, even if it is locked.
   82  */
   83 struct hpfsnode *
   84 hpfs_hphashlookup(dev, ino)
   85         struct cdev *dev;
   86         lsn_t ino;
   87 {
   88         struct hpfsnode *hp;
   89 
   90         mtx_lock(&hpfs_hphash_mtx);
   91         LIST_FOREACH(hp, HPNOHASH(dev, ino), h_hash)
   92                 if (ino == hp->h_no && dev == hp->h_dev)
   93                         break;
   94         mtx_unlock(&hpfs_hphash_mtx);
   95 
   96         return (hp);
   97 }
   98 
   99 #if 0
  100 struct hpfsnode *
  101 hpfs_hphashget(dev, ino)
  102         struct cdev *dev;
  103         lsn_t ino;
  104 {
  105         struct hpfsnode *hp;
  106 
  107 loop:
  108         mtx_lock(&hpfs_hphash_mtx);
  109         LIST_FOREACH(hp, HPNOHASH(dev, ino), h_hash) {
  110                 if (ino == hp->h_no && dev == hp->h_dev) {
  111                         lockmgr(&hp->h_intlock, LK_EXCLUSIVE | LK_INTERLOCK,
  112                             &hpfs_hphash_slock, NULL);
  113                         return (hp);
  114                 }
  115         }
  116         mtx_unlock(&hpfs_hphash_mtx);
  117         return (hp);
  118 }
  119 #endif
  120 
  121 int
  122 hpfs_hphashvget(dev, ino, flags, vpp, td)
  123         struct cdev *dev;
  124         lsn_t ino;
  125         int flags;
  126         struct vnode **vpp;
  127         struct thread *td;
  128 {
  129         struct hpfsnode *hp;
  130         struct vnode *vp;
  131         int error;
  132 
  133         *vpp = NULLVP;
  134 loop:
  135         mtx_lock(&hpfs_hphash_mtx);
  136         LIST_FOREACH(hp, HPNOHASH(dev, ino), h_hash) {
  137                 if (ino == hp->h_no && dev == hp->h_dev) {
  138                         vp = HPTOV(hp);
  139                         mtx_lock(&vp->v_interlock);
  140                         mtx_unlock(&hpfs_hphash_mtx);
  141                         error = vget(vp, flags | LK_INTERLOCK, td);
  142                         if (error == ENOENT)
  143                                 goto loop;
  144                         if (error)
  145                                 return (error);
  146                         *vpp = vp;
  147                         return (0);
  148                 }
  149         }
  150         mtx_unlock(&hpfs_hphash_mtx);
  151         return (0);
  152 }
  153 
  154 /*
  155  * Insert the hpfsnode into the hash table.
  156  */
  157 void
  158 hpfs_hphashins(hp)
  159         struct hpfsnode *hp;
  160 {
  161         struct hphashhead *hpp;
  162 
  163         mtx_lock(&hpfs_hphash_mtx);
  164         hpp = HPNOHASH(hp->h_dev, hp->h_no);
  165         hp->h_flag |= H_HASHED;
  166         LIST_INSERT_HEAD(hpp, hp, h_hash);
  167         mtx_unlock(&hpfs_hphash_mtx);
  168 }
  169 
  170 /*
  171  * Remove the inode from the hash table.
  172  */
  173 void
  174 hpfs_hphashrem(hp)
  175         struct hpfsnode *hp;
  176 {
  177         mtx_lock(&hpfs_hphash_mtx);
  178         if (hp->h_flag & H_HASHED) {
  179                 hp->h_flag &= ~H_HASHED;
  180                 LIST_REMOVE(hp, h_hash);
  181         }
  182         mtx_unlock(&hpfs_hphash_mtx);
  183 }

Cache object: 7ff193adf00429d1571c418ce90fcaac

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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