jfs_umount.c

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/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 *  jfs_umount.c
 *
 * note: file system in transition to aggregate/fileset:
 * (ref. jfs_mount.c)
 *
 * file system unmount is interpreted as mount of the single/only
 * fileset in the aggregate and, if unmount of the last fileset,
 * as unmount of the aggerate;
 */

#include <linux/fs.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_superblock.h"
#include "jfs_dmap.h"
#include "jfs_imap.h"
#include "jfs_metapage.h"
#include "jfs_debug.h"

/*
 * NAME:    jfs_umount(vfsp, flags, crp)
 *
 * FUNCTION:    vfs_umount()
 *
 * PARAMETERS:  vfsp    - virtual file system pointer
 *      flags   - unmount for shutdown
 *      crp - credential
 *
 * RETURN : EBUSY   - device has open files
 */
int jfs_umount(struct super_block *sb)
{
    struct jfs_sb_info *sbi = JFS_SBI(sb);
    struct inode *ipbmap = sbi->ipbmap;
    struct inode *ipimap = sbi->ipimap;
    struct inode *ipaimap = sbi->ipaimap;
    struct inode *ipaimap2 = sbi->ipaimap2;
    struct jfs_log *log;
    int rc = 0;

    jfs_info("UnMount JFS: sb:0x%p", sb);

    /*
     *  update superblock and close log
     *
     * if mounted read-write and log based recovery was enabled
     */
    if ((log = sbi->log))
        /*
         * Wait for outstanding transactions to be written to log:
         */
        jfs_flush_journal(log, 2);

    /*
     * close fileset inode allocation map (aka fileset inode)
     */
    diUnmount(ipimap, 0);

    diFreeSpecial(ipimap);
    sbi->ipimap = NULL;

    /*
     * close secondary aggregate inode allocation map
     */
    ipaimap2 = sbi->ipaimap2;
    if (ipaimap2) {
        diUnmount(ipaimap2, 0);
        diFreeSpecial(ipaimap2);
        sbi->ipaimap2 = NULL;
    }

    /*
     * close aggregate inode allocation map
     */
    ipaimap = sbi->ipaimap;
    diUnmount(ipaimap, 0);
    diFreeSpecial(ipaimap);
    sbi->ipaimap = NULL;

    /*
     * close aggregate block allocation map
     */
    dbUnmount(ipbmap, 0);

    diFreeSpecial(ipbmap);
    sbi->ipimap = NULL;

    /*
     * Make sure all metadata makes it to disk before we mark
     * the superblock as clean
     */
    filemap_write_and_wait(sbi->direct_inode->i_mapping);

    /*
     * ensure all file system file pages are propagated to their
     * home blocks on disk (and their in-memory buffer pages are
     * invalidated) BEFORE updating file system superblock state
     * (to signify file system is unmounted cleanly, and thus in
     * consistent state) and log superblock active file system
     * list (to signify skip logredo()).
     */
    if (log) {      /* log = NULL if read-only mount */
        updateSuper(sb, FM_CLEAN);

        /*
         * close log:
         *
         * remove file system from log active file system list.
         */
        rc = lmLogClose(sb);
    }
    jfs_info("UnMount JFS Complete: rc = %d", rc);
    return rc;
}


int jfs_umount_rw(struct super_block *sb)
{
    struct jfs_sb_info *sbi = JFS_SBI(sb);
    struct jfs_log *log = sbi->log;

    if (!log)
        return 0;

    /*
     * close log:
     *
     * remove file system from log active file system list.
     */
    jfs_flush_journal(log, 2);

    /*
     * Make sure all metadata makes it to disk
     */
    dbSync(sbi->ipbmap);
    diSync(sbi->ipimap);

    /*
     * Note that we have to do this even if sync_blockdev() will
     * do exactly the same a few instructions later:  We can't
     * mark the superblock clean before everything is flushed to
     * disk.
     */
    filemap_write_and_wait(sbi->direct_inode->i_mapping);

    updateSuper(sb, FM_CLEAN);

    return lmLogClose(sb);
}