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-rw-r--r--fs/jfs/jfs_umount.c178
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diff --git a/fs/jfs/jfs_umount.c b/fs/jfs/jfs_umount.c
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+/*
+ * 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);
+}
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