1 files changed, 153 insertions, 0 deletions
diff --git a/fs/jfs/jfs_umount.c b/fs/jfs/jfs_umount.c
new file mode 100644
index 0000000000..8ec43f53f6
--- /dev/null
+++ b/fs/jfs/jfs_umount.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   Copyright (C) International Business Machines Corp., 2000-2004
+ */
+
+/*
+ *	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
+	 */
+	if (ipaimap2) {
+		diUnmount(ipaimap2, 0);
+		diFreeSpecial(ipaimap2);
+		sbi->ipaimap2 = NULL;
+	}
+
+	/*
+	 * close aggregate inode allocation map
+	 */
+	diUnmount(ipaimap, 0);
+	diFreeSpecial(ipaimap);
+	sbi->ipaimap = NULL;
+
+	/*
+	 * close aggregate block allocation map
+	 */
+	dbUnmount(ipbmap, 0);
+
+	diFreeSpecial(ipbmap);
+	sbi->ipbmap = NULL;
+
+	/*
+	 * Make sure all metadata makes it to disk before we mark
+	 * the superblock as clean
+	 */
+	filemap_write_and_wait(sbi->direct_inode->i_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);
+
+		/*
+		 * 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 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_write_and_wait(sbi->direct_inode->i_mapping);
+
+	updateSuper(sb, FM_CLEAN);
+
+	return lmLogClose(sb);
+}