fs/jfs/jfs_umount.c

   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  */
  50 int 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, 1);
  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
 136 int 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, 1);
 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 }