bsd/ufs/ufs/ufs_inode.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1991, 1993, 1995
  25  *      The Regents of the University of California.  All rights reserved.
  26  * (c) UNIX System Laboratories, Inc.
  27  * All or some portions of this file are derived from material licensed
  28  * to the University of California by American Telephone and Telegraph
  29  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  30  * the permission of UNIX System Laboratories, Inc.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)ufs_inode.c 8.9 (Berkeley) 5/14/95
  61  */
  62
  63 #include <sys/param.h>
  64 #include <sys/systm.h>
  65 #include <sys/proc.h>
  66 #include <sys/vnode.h>
  67 #include <sys/mount.h>
  68 #include <sys/kernel.h>
  69 #include <sys/malloc.h>
  70
  71 #include <ufs/ufs/quota.h>
  72 #include <ufs/ufs/inode.h>
  73 #include <ufs/ufs/ufsmount.h>
  74 #include <ufs/ufs/ufs_extern.h>
  75
  76 u_long  nextgennumber;          /* Next generation number to assign. */
  77 extern int prtactive;
  78
  79 /*
  80  * Last reference to an inode.  If necessary, write or delete it.
  81  */
  82 int
  83 ufs_inactive(ap)
  84         struct vop_inactive_args /* {
  85                 struct vnode *a_vp;
  86                 struct proc *a_p;
  87         } */ *ap;
  88 {
  89         struct vnode *vp = ap->a_vp;
  90         struct inode *ip = VTOI(vp);
  91         struct proc *p = ap->a_p;
  92         struct timeval tv;
  93         int mode, error = 0;
  94         extern int prtactive;
  95
  96         if (prtactive && vp->v_usecount != 0)
  97                 vprint("ffs_inactive: pushing active", vp);
  98
  99         /*
 100          * Ignore inodes related to stale file handles.
 101          */
 102         if (ip->i_mode == 0)
 103                 goto out;
 104         if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 105 #if QUOTA
 106                 if (!getinoquota(ip))
 107                         (void)chkiq(ip, -1, NOCRED, 0);
 108 #endif
 109                 error = VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED, p);
 110                 ip->i_rdev = 0;
 111                 mode = ip->i_mode;
 112                 ip->i_mode = 0;
 113                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 114                 VOP_VFREE(vp, ip->i_number, mode);
 115         }
 116         if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) {
 117                 tv = time;
 118                 VOP_UPDATE(vp, &tv, &tv, 0);
 119         }
 120 out:
 121         VOP_UNLOCK(vp, 0, p);
 122         /*
 123          * If we are done with the inode, reclaim it
 124          * so that it can be reused immediately.
 125          */
 126         if (ip->i_mode == 0)
 127                 vrecycle(vp, (struct slock *)0, p);
 128         return (error);
 129 }
 130
 131 /*
 132  * Reclaim an inode so that it can be used for other purposes.
 133  */
 134 int
 135 ufs_reclaim(vp, p)
 136         struct vnode *vp;
 137         struct proc *p;
 138 {
 139         register struct inode *ip;
 140         int i;
 141         extern int prtactive;
 142
 143         if (prtactive && vp->v_usecount != 0)
 144                 vprint("ufs_reclaim: pushing active", vp);
 145         /*
 146          * Remove the inode from its hash chain.
 147          */
 148         ip = VTOI(vp);
 149         ufs_ihashrem(ip);
 150         /*
 151          * Purge old data structures associated with the inode.
 152          */
 153         cache_purge(vp);
 154         if (ip->i_devvp) {
 155                 vrele(ip->i_devvp);
 156                 ip->i_devvp = 0;
 157         }
 158 #if QUOTA
 159         for (i = 0; i < MAXQUOTAS; i++) {
 160                 if (ip->i_dquot[i] != NODQUOT) {
 161                         dqrele(vp, ip->i_dquot[i]);
 162                         ip->i_dquot[i] = NODQUOT;
 163                 }
 164         }
 165 #endif
 166         return (0);
 167 }