1 files changed, 178 insertions, 0 deletions

diff --git a/fs/jfs/jfs_umount.c b/fs/jfs/jfs_umount.c
new file mode 100644
index 000000000000..f31a9e3f3fec
--- /dev/null
+++ b/fs/jfs/jfs_umount.c
@@ -0,0 +1,178 @@
+/*
+ *   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 address_space *bdev_mapping = sb->s_bdev->bd_inode->i_mapping;
+        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_fdatawrite(bdev_mapping);
+        filemap_fdatawait(bdev_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);
+
+                /* Restore default gfp_mask for bdev */
+                mapping_set_gfp_mask(bdev_mapping, GFP_USER);
+
+                /*
+                 * 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 address_space *bdev_mapping = sb->s_bdev->bd_inode->i_mapping;
+        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_fdatawrite(bdev_mapping);
+        filemap_fdatawait(bdev_mapping);
+
+        updateSuper(sb, FM_CLEAN);
+
+        /* Restore default gfp_mask for bdev */
+        mapping_set_gfp_mask(bdev_mapping, GFP_USER);
+
+        return lmLogClose(sb);
+}