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/ufs/ufs/ufs_ihash.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  * $FreeBSD$
   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/malloc.h>
   43 #include <sys/proc.h>
   44 
   45 #include <ufs/ufs/quota.h>
   46 #include <ufs/ufs/inode.h>
   47 #include <ufs/ufs/ufs_extern.h>
   48 
   49 static MALLOC_DEFINE(M_UFSIHASH, "UFS ihash", "UFS Inode hash tables");
   50 /*
   51  * Structures associated with inode cacheing.
   52  */
   53 static LIST_HEAD(ihashhead, inode) *ihashtbl;
   54 static u_long   ihash;          /* size of hash table - 1 */
   55 #define INOHASH(device, inum)   (&ihashtbl[((device) + (inum)) & ihash])
   56 #ifndef NULL_SIMPLELOCKS
   57 static struct simplelock ufs_ihash_slock;
   58 #endif
   59 
   60 /*
   61  * Initialize inode hash table.
   62  */
   63 void
   64 ufs_ihashinit()
   65 {
   66 
   67         ihashtbl = hashinit(desiredvnodes, M_UFSIHASH, &ihash);
   68         simple_lock_init(&ufs_ihash_slock);
   69 }
   70 
   71 /*
   72  * Use the device/inum pair to find the incore inode, and return a pointer
   73  * to it. If it is in core, return it, even if it is locked.
   74  */
   75 struct vnode *
   76 ufs_ihashlookup(dev, inum)
   77         dev_t dev;
   78         ino_t inum;
   79 {
   80         struct inode *ip;
   81 
   82         simple_lock(&ufs_ihash_slock);
   83         for (ip = INOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next)
   84                 if (inum == ip->i_number && dev == ip->i_dev)
   85                         break;
   86         simple_unlock(&ufs_ihash_slock);
   87 
   88         if (ip)
   89                 return (ITOV(ip));
   90         return (NULLVP);
   91 }
   92 
   93 /*
   94  * Use the device/inum pair to find the incore inode, and return a pointer
   95  * to it. If it is in core, but locked, wait for it.
   96  */
   97 struct vnode *
   98 ufs_ihashget(dev, inum)
   99         dev_t dev;
  100         ino_t inum;
  101 {
  102         struct proc *p = curproc;       /* XXX */
  103         struct inode *ip;
  104         struct vnode *vp;
  105 
  106 loop:
  107         simple_lock(&ufs_ihash_slock);
  108         for (ip = INOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) {
  109                 if (inum == ip->i_number && dev == ip->i_dev) {
  110                         vp = ITOV(ip);
  111                         simple_lock(&vp->v_interlock);
  112                         simple_unlock(&ufs_ihash_slock);
  113                         if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
  114                                 goto loop;
  115                         return (vp);
  116                 }
  117         }
  118         simple_unlock(&ufs_ihash_slock);
  119         return (NULL);
  120 }
  121 
  122 /*
  123  * Insert the inode into the hash table, and return it locked.
  124  */
  125 void
  126 ufs_ihashins(ip)
  127         struct inode *ip;
  128 {
  129         struct proc *p = curproc;               /* XXX */
  130         struct ihashhead *ipp;
  131 
  132         /* lock the inode, then put it on the appropriate hash list */
  133         lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p);
  134 
  135         simple_lock(&ufs_ihash_slock);
  136         ipp = INOHASH(ip->i_dev, ip->i_number);
  137         LIST_INSERT_HEAD(ipp, ip, i_hash);
  138         ip->i_flag |= IN_HASHED;
  139         simple_unlock(&ufs_ihash_slock);
  140 }
  141 
  142 /*
  143  * Remove the inode from the hash table.
  144  */
  145 void
  146 ufs_ihashrem(ip)
  147         struct inode *ip;
  148 {
  149         simple_lock(&ufs_ihash_slock);
  150         if (ip->i_flag & IN_HASHED) {
  151                 ip->i_flag &= ~IN_HASHED;
  152                 LIST_REMOVE(ip, i_hash);
  153 #ifdef DIAGNOSTIC
  154                 ip->i_hash.le_next = NULL;
  155                 ip->i_hash.le_prev = NULL;
  156 #endif
  157         }
  158         simple_unlock(&ufs_ihash_slock);
  159 }

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