Annotation of sys/ufs/ufs/ufs_inode.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ufs_inode.c,v 1.37 2007/06/01 23:47:57 deraadt Exp $ */
! 2: /* $NetBSD: ufs_inode.c,v 1.7 1996/05/11 18:27:52 mycroft Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1991, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: * (c) UNIX System Laboratories, Inc.
! 8: * All or some portions of this file are derived from material licensed
! 9: * to the University of California by American Telephone and Telegraph
! 10: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
! 11: * the permission of UNIX System Laboratories, Inc.
! 12: *
! 13: * Redistribution and use in source and binary forms, with or without
! 14: * modification, are permitted provided that the following conditions
! 15: * are met:
! 16: * 1. Redistributions of source code must retain the above copyright
! 17: * notice, this list of conditions and the following disclaimer.
! 18: * 2. Redistributions in binary form must reproduce the above copyright
! 19: * notice, this list of conditions and the following disclaimer in the
! 20: * documentation and/or other materials provided with the distribution.
! 21: * 3. Neither the name of the University nor the names of its contributors
! 22: * may be used to endorse or promote products derived from this software
! 23: * without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 35: * SUCH DAMAGE.
! 36: *
! 37: * @(#)ufs_inode.c 8.7 (Berkeley) 7/22/94
! 38: */
! 39:
! 40: #include <sys/param.h>
! 41: #include <sys/systm.h>
! 42: #include <sys/proc.h>
! 43: #include <sys/vnode.h>
! 44: #include <sys/mount.h>
! 45: #include <sys/kernel.h>
! 46: #include <sys/malloc.h>
! 47: #include <sys/namei.h>
! 48:
! 49: #include <ufs/ufs/quota.h>
! 50: #include <ufs/ufs/inode.h>
! 51: #include <ufs/ufs/ufsmount.h>
! 52: #include <ufs/ufs/ufs_extern.h>
! 53: #ifdef UFS_DIRHASH
! 54: #include <ufs/ufs/dir.h>
! 55: #include <ufs/ufs/dirhash.h>
! 56: #endif
! 57:
! 58: /*
! 59: * Last reference to an inode. If necessary, write or delete it.
! 60: */
! 61: int
! 62: ufs_inactive(void *v)
! 63: {
! 64: struct vop_inactive_args *ap = v;
! 65: struct vnode *vp = ap->a_vp;
! 66: struct inode *ip = VTOI(vp);
! 67: struct proc *p = ap->a_p;
! 68: mode_t mode;
! 69: int error = 0;
! 70: #ifdef DIAGNOSTIC
! 71: extern int prtactive;
! 72:
! 73: if (prtactive && vp->v_usecount != 0)
! 74: vprint("ffs_inactive: pushing active", vp);
! 75: #endif
! 76:
! 77: /*
! 78: * Ignore inodes related to stale file handles.
! 79: */
! 80: if (ip->i_din1 == NULL || DIP(ip, mode) == 0)
! 81: goto out;
! 82:
! 83: if (DIP(ip, nlink) <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
! 84: if (getinoquota(ip) == 0)
! 85: (void)ufs_quota_free_inode(ip, NOCRED);
! 86:
! 87: error = UFS_TRUNCATE(ip, (off_t)0, 0, NOCRED);
! 88:
! 89: DIP_ASSIGN(ip, rdev, 0);
! 90: mode = DIP(ip, mode);
! 91: DIP_ASSIGN(ip, mode, 0);
! 92: ip->i_flag |= IN_CHANGE | IN_UPDATE;
! 93:
! 94: /*
! 95: * Setting the mode to zero needs to wait for the inode to be
! 96: * written just as does a change to the link count. So, rather
! 97: * than creating a new entry point to do the same thing, we
! 98: * just use softdep_change_linkcnt(). Also, we can't let
! 99: * softdep co-opt us to help on its worklist, as we may end up
! 100: * trying to recycle vnodes and getting to this same point a
! 101: * couple of times, blowing the kernel stack. However, this
! 102: * could be optimized by checking if we are coming from
! 103: * vrele(), vput() or vclean() (by checking for VXLOCK) and
! 104: * just avoiding the co-opt to happen in the last case.
! 105: */
! 106: if (DOINGSOFTDEP(vp))
! 107: softdep_change_linkcnt(ip, 1);
! 108:
! 109: UFS_INODE_FREE(ip, ip->i_number, mode);
! 110: }
! 111:
! 112: if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) {
! 113: UFS_UPDATE(ip, 0);
! 114: }
! 115: out:
! 116: VOP_UNLOCK(vp, 0, p);
! 117:
! 118: /*
! 119: * If we are done with the inode, reclaim it
! 120: * so that it can be reused immediately.
! 121: */
! 122: if (ip->i_din1 == NULL || DIP(ip, mode) == 0)
! 123: vrecycle(vp, p);
! 124:
! 125: return (error);
! 126: }
! 127:
! 128: /*
! 129: * Reclaim an inode so that it can be used for other purposes.
! 130: */
! 131: int
! 132: ufs_reclaim(struct vnode *vp, struct proc *p)
! 133: {
! 134: struct inode *ip;
! 135: #ifdef DIAGNOSTIC
! 136: extern int prtactive;
! 137:
! 138: if (prtactive && vp->v_usecount != 0)
! 139: vprint("ufs_reclaim: pushing active", vp);
! 140: #endif
! 141:
! 142: /*
! 143: * Remove the inode from its hash chain.
! 144: */
! 145: ip = VTOI(vp);
! 146: ufs_ihashrem(ip);
! 147: /*
! 148: * Purge old data structures associated with the inode.
! 149: */
! 150: cache_purge(vp);
! 151:
! 152: if (ip->i_devvp) {
! 153: vrele(ip->i_devvp);
! 154: }
! 155: #ifdef UFS_DIRHASH
! 156: if (ip->i_dirhash != NULL)
! 157: ufsdirhash_free(ip);
! 158: #endif
! 159: ufs_quota_delete(ip);
! 160: return (0);
! 161: }
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