FreeBSD/Linux Kernel Cross Reference
sys/fs/filecorefs/filecore_node.c

     /*      $NetBSD: filecore_node.c,v 1.3 2004/03/27 04:43:43 atatat Exp $ */
     
     /*-
      * Copyright (c) 1982, 1986, 1989, 1994 
      *           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.
     *
     *      filecore_node.c         1.0     1998/6/4
     */
    
    /*-
     * Copyright (c) 1998 Andrew McMurry
     *
     * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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.
     *
     *      filecore_node.c         1.0     1998/6/4
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: filecore_node.c,v 1.3 2004/03/27 04:43:43 atatat Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/mount.h>
    #include <sys/proc.h>
    #include <sys/file.h>
    #include <sys/buf.h>
    #include <sys/vnode.h>
    #include <sys/namei.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/pool.h>
    #include <sys/stat.h>
    
    #include <fs/filecorefs/filecore.h>
    #include <fs/filecorefs/filecore_extern.h>
    #include <fs/filecorefs/filecore_node.h>
    #include <fs/filecorefs/filecore_mount.h>
    
    /*
     * Structures associated with filecore_node caching.
     */
    LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl;
    u_long filecorehash;
    #define INOHASH(device, inum)   (((device) + ((inum)>>12)) & filecorehash)
    struct simplelock filecore_ihash_slock;
    
    struct pool filecore_node_pool;
    
   extern int prtactive;   /* 1 => print out reclaim of active vnodes */
   
   /*
    * Initialize hash links for inodes and dnodes.
    */
   void
   filecore_init()
   {
   #ifdef _LKM
           malloc_type_attach(M_FILECOREMNT);
   #endif
           filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT,
               M_WAITOK, &filecorehash);
           simple_lock_init(&filecore_ihash_slock);
           pool_init(&filecore_node_pool, sizeof(struct filecore_node),
               0, 0, 0, "filecrnopl", &pool_allocator_nointr);
   }
   
   /*
    * Reinitialize inode hash table.
    */
   void
   filecore_reinit()
   {
           struct filecore_node *ip;
           struct ihashhead *oldhash, *hash;
           u_long oldmask, mask, val;
           int i;
   
           hash = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT, M_WAITOK,
               &mask);
   
           simple_lock(&filecore_ihash_slock);
           oldhash = filecorehashtbl;
           oldmask = filecorehash;
           filecorehashtbl = hash;
           filecorehash = mask;
           for (i = 0; i <= oldmask; i++) {
                   while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
                           LIST_REMOVE(ip, i_hash);
                           val = INOHASH(ip->i_dev, ip->i_number);
                           LIST_INSERT_HEAD(&hash[val], ip, i_hash);
                   }
           }
           simple_unlock(&filecore_ihash_slock);
           hashdone(oldhash, M_FILECOREMNT);
   }
   
   /*
    * Destroy node pool and hash table.
    */
   void
   filecore_done()
   {
           pool_destroy(&filecore_node_pool);
           hashdone(filecorehashtbl, M_FILECOREMNT);
   #ifdef _LKM
           malloc_type_detach(M_FILECOREMNT);
   #endif
   }
   
   /*
    * Use the device/inum pair to find the incore inode, and return a pointer
    * to it. If it is in core, but locked, wait for it.
    */
   struct vnode *
   filecore_ihashget(dev, inum)
           dev_t dev;
           ino_t inum;
   {
           struct filecore_node *ip;
           struct vnode *vp;
   
   loop:
           simple_lock(&filecore_ihash_slock);
           LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) {
                   if (inum == ip->i_number && dev == ip->i_dev) {
                           vp = ITOV(ip);
                           simple_lock(&vp->v_interlock);
                           simple_unlock(&filecore_ihash_slock);
                           if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
                                   goto loop;
                           return (vp);
                   }
           }
           simple_unlock(&filecore_ihash_slock);
           return (NULL);
   }
   
   /*
    * Insert the inode into the hash table, and return it locked.
    */
   void
   filecore_ihashins(ip)
           struct filecore_node *ip;
   {
           struct ihashhead *ipp;
           struct vnode *vp;
   
           simple_lock(&filecore_ihash_slock);
           ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)];
           LIST_INSERT_HEAD(ipp, ip, i_hash);
           simple_unlock(&filecore_ihash_slock);
   
           vp = ip->i_vnode;
           lockmgr(&vp->v_lock, LK_EXCLUSIVE, &vp->v_interlock);
   }
   
   /*
    * Remove the inode from the hash table.
    */
   void
   filecore_ihashrem(ip)
           struct filecore_node *ip;
   {
           simple_lock(&filecore_ihash_slock);
           LIST_REMOVE(ip, i_hash);
           simple_unlock(&filecore_ihash_slock);
   }
   
   /*
    * Last reference to an inode, write the inode out and if necessary,
    * truncate and deallocate the file.
    */
   int
   filecore_inactive(v)
           void *v;
   {
           struct vop_inactive_args /* {
                   struct vnode *a_vp;
                   struct proc *a_p;
           } */ *ap = v;
           struct vnode *vp = ap->a_vp;
           struct proc *p = ap->a_p;
           struct filecore_node *ip = VTOI(vp);
           int error = 0;
           
           if (prtactive && vp->v_usecount != 0)
                   vprint("filecore_inactive: pushing active", vp);
           
           ip->i_flag = 0;
           VOP_UNLOCK(vp, 0);
           /*
            * If we are done with the inode, reclaim it
            * so that it can be reused immediately.
            */
           if (filecore_staleinode(ip))
                   vrecycle(vp, (struct simplelock *)0, p);
           return error;
   }
   
   /*
    * Reclaim an inode so that it can be used for other purposes.
    */
   int
   filecore_reclaim(v)
           void *v;
   {
           struct vop_reclaim_args /* {
                   struct vnode *a_vp;
                   struct proc *a_p;
           } */ *ap = v;
           struct vnode *vp = ap->a_vp;
           struct filecore_node *ip = VTOI(vp);
           
           if (prtactive && vp->v_usecount != 0)
                   vprint("filecore_reclaim: pushing active", vp);
           /*
            * Remove the inode from its hash chain.
            */
           filecore_ihashrem(ip);
           /*
            * Purge old data structures associated with the inode.
            */
           cache_purge(vp);
           if (ip->i_devvp) {
                   vrele(ip->i_devvp);
                   ip->i_devvp = 0;
           }
           pool_put(&filecore_node_pool, vp->v_data);
           vp->v_data = NULL;
           return (0);
   }

Cache object: d29e3d4514c4489ef700254451287315