Subversion Repositories or1k

/*

 *   Copyright (c) International Business Machines Corp., 2000-2002

 *

 *   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

         */

        fsync_inode_data_buffers(sb->s_bdev->bd_inode);

        /*

         * 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 */

                rc = updateSuper(sb, FM_CLEAN);

                /*

                 * close log:

                 *

                 * remove file system from log active file system list.

                 */

                rc = lmLogClose(sb, log);

        }

        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);

        fsync_inode_data_buffers(sb->s_bdev->bd_inode);

        updateSuper(sb, FM_CLEAN);

        sbi->log = NULL;

        return lmLogClose(sb, log);

}