FreeBSD/Linux Kernel Cross Reference
sys/ufs/ufs/ufs_inode.c

     /*
      * Copyright (c) 1991, 1993, 1995
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * 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.
     *
     *      @(#)ufs_inode.c 8.9 (Berkeley) 5/14/95
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.2/sys/ufs/ufs/ufs_inode.c 120777 2003-10-05 02:45:00Z jeff $");
    
    #include "opt_quota.h"
    #include "opt_ufs.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/vnode.h>
    #include <sys/lock.h>
    #include <sys/mount.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    
    #include <ufs/ufs/extattr.h>
    #include <ufs/ufs/quota.h>
    #include <ufs/ufs/inode.h>
    #include <ufs/ufs/ufsmount.h>
    #include <ufs/ufs/ufs_extern.h>
    #ifdef UFS_DIRHASH
    #include <ufs/ufs/dir.h>
    #include <ufs/ufs/dirhash.h>
    #endif
    
    /*
     * Last reference to an inode.  If necessary, write or delete it.
     */
    int
    ufs_inactive(ap)
            struct vop_inactive_args /* {
                    struct vnode *a_vp;
                    struct thread *a_td;
            } */ *ap;
    {
            struct vnode *vp = ap->a_vp;
            struct inode *ip = VTOI(vp);
            struct thread *td = ap->a_td;
            mode_t mode;
            int error = 0;
    
            VI_LOCK(vp);
            if (prtactive && vp->v_usecount != 0)
                    vprint("ufs_inactive: pushing active", vp);
            VI_UNLOCK(vp);
    
            /*
             * Ignore inodes related to stale file handles.
             */
            if (ip->i_mode == 0)
                    goto out;
            if (ip->i_effnlink == 0 && DOINGSOFTDEP(vp))
                    softdep_releasefile(ip);
            if (ip->i_nlink <= 0) {
                    (void) vn_write_suspend_wait(vp, NULL, V_WAIT);
    #ifdef QUOTA
                    if (!getinoquota(ip))
                            (void)chkiq(ip, -1, NOCRED, FORCE);
    #endif
    #ifdef UFS_EXTATTR
                   ufs_extattr_vnode_inactive(vp, td);
   #endif
                   error = UFS_TRUNCATE(vp, (off_t)0, IO_EXT | IO_NORMAL,
                       NOCRED, td);
                   /*
                    * Setting the mode to zero needs to wait for the inode
                    * to be written just as does a change to the link count.
                    * So, rather than creating a new entry point to do the
                    * same thing, we just use softdep_change_linkcnt().
                    */
                   DIP(ip, i_rdev) = 0;
                   mode = ip->i_mode;
                   ip->i_mode = 0;
                   DIP(ip, i_mode) = 0;
                   ip->i_flag |= IN_CHANGE | IN_UPDATE;
                   if (DOINGSOFTDEP(vp))
                           softdep_change_linkcnt(ip);
                   UFS_VFREE(vp, ip->i_number, mode);
           }
           if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) {
                   if ((ip->i_flag & (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 &&
                       vn_write_suspend_wait(vp, NULL, V_NOWAIT)) {
                           ip->i_flag &= ~IN_ACCESS;
                   } else {
                           (void) vn_write_suspend_wait(vp, NULL, V_WAIT);
                           UFS_UPDATE(vp, 0);
                   }
           }
   out:
           VOP_UNLOCK(vp, 0, td);
           /*
            * If we are done with the inode, reclaim it
            * so that it can be reused immediately.
            */
           if (ip->i_mode == 0)
                   vrecycle(vp, NULL, td);
           return (error);
   }
   
   /*
    * Reclaim an inode so that it can be used for other purposes.
    */
   int
   ufs_reclaim(ap)
           struct vop_reclaim_args /* {
                   struct vnode *a_vp;
                   struct thread *a_td;
           } */ *ap;
   {
           struct vnode *vp = ap->a_vp;
           struct inode *ip = VTOI(vp);
           struct ufsmount *ump = ip->i_ump;
   #ifdef QUOTA
           int i;
   #endif
   
           VI_LOCK(vp);
           if (prtactive && vp->v_usecount != 0)
                   vprint("ufs_reclaim: pushing active", vp);
           VI_UNLOCK(vp);
           if (ip->i_flag & IN_LAZYMOD) {
                   ip->i_flag |= IN_MODIFIED;
                   UFS_UPDATE(vp, 0);
           }
           /*
            * Remove the inode from its hash chain.
            */
           ufs_ihashrem(ip);
           /*
            * Purge old data structures associated with the inode.
            */
           vrele(ip->i_devvp);
   #ifdef QUOTA
           for (i = 0; i < MAXQUOTAS; i++) {
                   if (ip->i_dquot[i] != NODQUOT) {
                           dqrele(vp, ip->i_dquot[i]);
                           ip->i_dquot[i] = NODQUOT;
                   }
           }
   #endif
   #ifdef UFS_DIRHASH
           if (ip->i_dirhash != NULL)
                   ufsdirhash_free(ip);
   #endif
           UFS_IFREE(ump, ip);
           vp->v_data = 0;
           return (0);
   }

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