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ufs_gjournal.c

/*-
 * Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/ufs/ufs/ufs_gjournal.c,v 1.2 2007/05/28 00:28:15 pjd Exp $");

#include "opt_ufs.h"

#ifdef UFS_GJOURNAL

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/mount.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/gjournal.h>

#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

/*
 * Change the number of unreferenced inodes.
 */
static int
ufs_gjournal_modref(struct vnode *vp, int count)
{
      struct cg *cgp;
      struct buf *bp;
      ufs2_daddr_t cgbno;
      int error, cg;
      struct cdev *dev;
      struct inode *ip;
      struct ufsmount *ump;
      struct fs *fs;
      struct vnode *devvp;
      ino_t ino;

      ip = VTOI(vp);
      ump = ip->i_ump;
      fs = ip->i_fs;
      devvp = ip->i_devvp;
      ino = ip->i_number;

      cg = ino_to_cg(fs, ino);
      if (devvp->v_type != VCHR) {
            /* devvp is a snapshot */
            dev = VTOI(devvp)->i_devvp->v_rdev;
            cgbno = fragstoblks(fs, cgtod(fs, cg));
      } else {
            /* devvp is a normal disk device */
            dev = devvp->v_rdev;
            cgbno = fsbtodb(fs, cgtod(fs, cg));
      }
      if ((u_int)ino >= fs->fs_ipg * fs->fs_ncg)
            panic("ffs_freefile: range: dev = %s, ino = %lu, fs = %s",
                devtoname(dev), (u_long)ino, fs->fs_fsmnt);
      if ((error = bread(devvp, cgbno, (int)fs->fs_cgsize, NOCRED, &bp))) {
            brelse(bp);
            return (error);
      }
      cgp = (struct cg *)bp->b_data;
      if (!cg_chkmagic(cgp)) {
            brelse(bp);
            return (0);
      }
      bp->b_xflags |= BX_BKGRDWRITE;
      cgp->cg_unrefs += count;
      UFS_LOCK(ump);
      fs->fs_unrefs += count;
      fs->fs_fmod = 1;
      ACTIVECLEAR(fs, cg);
      UFS_UNLOCK(ump);
      bdwrite(bp);
      return (0);
}

void
ufs_gjournal_orphan(struct vnode *vp)
{
      struct inode *ip;

      if (vp->v_mount->mnt_gjprovider == NULL)
            return;
      if (vp->v_usecount < 2 || (vp->v_vflag & VV_DELETED))
            return;
      ip = VTOI(vp);
      if ((vp->v_type == VDIR && ip->i_nlink > 2) ||
          (vp->v_type != VDIR && ip->i_nlink > 1)) {
            return;
      }
      vp->v_vflag |= VV_DELETED;

      ufs_gjournal_modref(vp, 1);
}

void
ufs_gjournal_close(struct vnode *vp)
{
      struct inode *ip;

      if (vp->v_mount->mnt_gjprovider == NULL)
            return;
      if (!(vp->v_vflag & VV_DELETED))
            return;
      ip = VTOI(vp);
      if (ip->i_nlink > 0)
            return;
      ufs_gjournal_modref(vp, -1);
}

#endif /* UFS_GJOURNAL */

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