FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/ntfs_ihash.c

     /*      $NetBSD: ntfs_ihash.c,v 1.11 2015/02/20 17:08:13 maxv Exp $     */
     
     /*
      * Copyright (c) 1982, 1986, 1989, 1991, 1993, 1995
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
     * Id: ntfs_ihash.c,v 1.5 1999/05/12 09:42:58 semenu Exp
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: ntfs_ihash.c,v 1.11 2015/02/20 17:08:13 maxv Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/mallocvar.h>
    
    #include <fs/ntfs/ntfs.h>
    #include <fs/ntfs/ntfs_inode.h>
    #include <fs/ntfs/ntfs_ihash.h>
    
    /*
     * Structures associated with inode cacheing.
     */
    static LIST_HEAD(nthashhead, ntnode) *ntfs_nthashtbl;
    static u_long   ntfs_nthash;            /* size of hash table - 1 */
    #define NTNOHASH(device, inum)  ((minor(device) + (inum)) & ntfs_nthash)
    static kmutex_t ntfs_nthash_lock;
    kmutex_t ntfs_hashlock;
    
    /*
     * Initialize inode hash table.
     */
    void
    ntfs_nthashinit(void)
    {
            mutex_init(&ntfs_hashlock, MUTEX_DEFAULT, IPL_NONE);
            mutex_init(&ntfs_nthash_lock, MUTEX_DEFAULT, IPL_NONE);
            ntfs_nthashtbl = hashinit(desiredvnodes, HASH_LIST, true, &ntfs_nthash);
    }
    
    /*
     * Reinitialize inode hash table.
     */
    
    void
    ntfs_nthashreinit(void)
    {
            struct ntnode *ip;
            struct nthashhead *oldhash, *hash;
            u_long oldmask, mask, val;
            int i;
    
            hash = hashinit(desiredvnodes, HASH_LIST, true, &mask);
    
            mutex_enter(&ntfs_nthash_lock);
            oldhash = ntfs_nthashtbl;
            oldmask = ntfs_nthash;
            ntfs_nthashtbl = hash;
            ntfs_nthash = mask;
            for (i = 0; i <= oldmask; i++) {
                    while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
                            LIST_REMOVE(ip, i_hash);
                            val = NTNOHASH(ip->i_dev, ip->i_number);
                            LIST_INSERT_HEAD(&hash[val], ip, i_hash);
                    }
            }
            mutex_exit(&ntfs_nthash_lock);
            hashdone(oldhash, HASH_LIST, oldmask);
    }
    
   /*
    * Free the inode hash table. Called from ntfs_done(), only needed
    * on NetBSD.
    */
   void
   ntfs_nthashdone(void)
   {
           hashdone(ntfs_nthashtbl, HASH_LIST, ntfs_nthash);
           mutex_destroy(&ntfs_hashlock);
           mutex_destroy(&ntfs_nthash_lock);
   }
   
   /*
    * Use the device/inum pair to find the incore inode, and return a pointer
    * to it. If it is in core, return it, even if it is locked.
    */
   struct ntnode *
   ntfs_nthashlookup(dev_t dev, ino_t inum)
   {
           struct ntnode *ip;
           struct nthashhead *ipp;
   
           mutex_enter(&ntfs_nthash_lock);
           ipp = &ntfs_nthashtbl[NTNOHASH(dev, inum)];
           LIST_FOREACH(ip, ipp, i_hash) {
                   if (inum == ip->i_number && dev == ip->i_dev)
                           break;
           }
           mutex_exit(&ntfs_nthash_lock);
   
           return (ip);
   }
   
   /*
    * Insert the ntnode into the hash table.
    */
   void
   ntfs_nthashins(struct ntnode *ip)
   {
           struct nthashhead *ipp;
   
           mutex_enter(&ntfs_nthash_lock);
           ipp = &ntfs_nthashtbl[NTNOHASH(ip->i_dev, ip->i_number)];
           LIST_INSERT_HEAD(ipp, ip, i_hash);
           ip->i_flag |= IN_HASHED;
           mutex_exit(&ntfs_nthash_lock);
   }
   
   /*
    * Remove the inode from the hash table.
    */
   void
   ntfs_nthashrem(struct ntnode *ip)
   {
           mutex_enter(&ntfs_nthash_lock);
           if (ip->i_flag & IN_HASHED) {
                   ip->i_flag &= ~IN_HASHED;
                   LIST_REMOVE(ip, i_hash);
           }
           mutex_exit(&ntfs_nthash_lock);
   }

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