LXR linux/fs/jfs/jfs

   1/*
   2 *   Copyright (C) International Business Machines Corp., 2000-2004
   3 *
   4 *   This program is free software;  you can redistribute it and/or modify
   5 *   it under the terms of the GNU General Public License as published by
   6 *   the Free Software Foundation; either version 2 of the License, or
   7 *   (at your option) any later version.
   8 *
   9 *   This program is distributed in the hope that it will be useful,
  10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  12 *   the GNU General Public License for more details.
  13 *
  14 *   You should have received a copy of the GNU General Public License
  15 *   along with this program;  if not, write to the Free Software
  16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 */
  18
  19/*
  20 *      jfs_umount.c
  21 *
  22 * note: file system in transition to aggregate/fileset:
  23 * (ref. jfs_mount.c)
  24 *
  25 * file system unmount is interpreted as mount of the single/only
  26 * fileset in the aggregate and, if unmount of the last fileset,
  27 * as unmount of the aggerate;
  28 */
  29
  30#include <linux/fs.h>
  31#include "jfs_incore.h"
  32#include "jfs_filsys.h"
  33#include "jfs_superblock.h"
  34#include "jfs_dmap.h"
  35#include "jfs_imap.h"
  36#include "jfs_metapage.h"
  37#include "jfs_debug.h"
  38
  39/*
  40 * NAME:        jfs_umount(vfsp, flags, crp)
  41 *
  42 * FUNCTION:    vfs_umount()
  43 *
  44 * PARAMETERS:  vfsp    - virtual file system pointer
  45 *              flags   - unmount for shutdown
  46 *              crp     - credential
  47 *
  48 * RETURN :     EBUSY   - device has open files
  49 */
  50int jfs_umount(struct super_block *sb)
  51{
  52        struct jfs_sb_info *sbi = JFS_SBI(sb);
  53        struct inode *ipbmap = sbi->ipbmap;
  54        struct inode *ipimap = sbi->ipimap;
  55        struct inode *ipaimap = sbi->ipaimap;
  56        struct inode *ipaimap2 = sbi->ipaimap2;
  57        struct jfs_log *log;
  58        int rc = 0;
  59
  60        jfs_info("UnMount JFS: sb:0x%p", sb);
  61
  62        /*
  63         *      update superblock and close log
  64         *
  65         * if mounted read-write and log based recovery was enabled
  66         */
  67        if ((log = sbi->log))
  68                /*
  69                 * Wait for outstanding transactions to be written to log:
  70                 */
  71                jfs_flush_journal(log, 2);
  72
  73        /*
  74         * close fileset inode allocation map (aka fileset inode)
  75         */
  76        diUnmount(ipimap, 0);
  77
  78        diFreeSpecial(ipimap);
  79        sbi->ipimap = NULL;
  80
  81        /*
  82         * close secondary aggregate inode allocation map
  83         */
  84        ipaimap2 = sbi->ipaimap2;
  85        if (ipaimap2) {
  86                diUnmount(ipaimap2, 0);
  87                diFreeSpecial(ipaimap2);
  88                sbi->ipaimap2 = NULL;
  89        }
  90
  91        /*
  92         * close aggregate inode allocation map
  93         */
  94        ipaimap = sbi->ipaimap;
  95        diUnmount(ipaimap, 0);
  96        diFreeSpecial(ipaimap);
  97        sbi->ipaimap = NULL;
  98
  99        /*
 100         * close aggregate block allocation map
 101         */
 102        dbUnmount(ipbmap, 0);
 103
 104        diFreeSpecial(ipbmap);
 105        sbi->ipimap = NULL;
 106
 107        /*
 108         * Make sure all metadata makes it to disk before we mark
 109         * the superblock as clean
 110         */
 111        filemap_write_and_wait(sbi->direct_inode->i_mapping);
 112
 113        /*
 114         * ensure all file system file pages are propagated to their
 115         * home blocks on disk (and their in-memory buffer pages are
 116         * invalidated) BEFORE updating file system superblock state
 117         * (to signify file system is unmounted cleanly, and thus in
 118         * consistent state) and log superblock active file system
 119         * list (to signify skip logredo()).
 120         */
 121        if (log) {              /* log = NULL if read-only mount */
 122                updateSuper(sb, FM_CLEAN);
 123
 124                /*
 125                 * close log:
 126                 *
 127                 * remove file system from log active file system list.
 128                 */
 129                rc = lmLogClose(sb);
 130        }
 131        jfs_info("UnMount JFS Complete: rc = %d", rc);
 132        return rc;
 133}
 134
 135
 136int jfs_umount_rw(struct super_block *sb)
 137{
 138        struct jfs_sb_info *sbi = JFS_SBI(sb);
 139        struct jfs_log *log = sbi->log;
 140
 141        if (!log)
 142                return 0;
 143
 144        /*
 145         * close log:
 146         *
 147         * remove file system from log active file system list.
 148         */
 149        jfs_flush_journal(log, 2);
 150
 151        /*
 152         * Make sure all metadata makes it to disk
 153         */
 154        dbSync(sbi->ipbmap);
 155        diSync(sbi->ipimap);
 156
 157        /*
 158         * Note that we have to do this even if sync_blockdev() will
 159         * do exactly the same a few instructions later:  We can't
 160         * mark the superblock clean before everything is flushed to
 161         * disk.
 162         */
 163        filemap_write_and_wait(sbi->direct_inode->i_mapping);
 164
 165        updateSuper(sb, FM_CLEAN);
 166
 167        return lmLogClose(sb);
 168}
 169