root/fs/jfs/jfs_umount.c

DEFINITIONS

1. jfs_umount
2. jfs_umount_rw

/*
 *   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, 1);

        /*
         * 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, 1);

        /*
         * 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);
}