ocfs2: Switch over to JBD2.

ocfs2 wants JBD2 for many reasons, not the least of which is that JBD is
limiting our maximum filesystem size.

It's a pretty trivial change.  Most functions are just renamed.  The
only functional change is moving to Jan's inode-based ordered data mode.
It's better, too.

Because JBD2 reads and writes JBD journals, this is compatible with any
existing filesystem.  It can even interact with JBD-based ocfs2 as long
as the journal is formated for JBD.

We provide a compatibility option so that paranoid people can still use
JBD for the time being.  This will go away shortly.

[ Moved call of ocfs2_begin_ordered_truncate() from ocfs2_delete_inode() to
  ocfs2_truncate_for_delete(). --Mark ]

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/fs/ocfs2/ocfs2_jbd_compat.h b/fs/ocfs2/ocfs2_jbd_compat.h
new file mode 100644
index 00000000000..b91c78f8f55
--- /dev/null
+++ b/fs/ocfs2/ocfs2_jbd_compat.h
@@ -0,0 +1,82 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * ocfs2_jbd_compat.h
+ *
+ * Compatibility defines for JBD.
+ *
+ * Copyright (C) 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#ifndef OCFS2_JBD_COMPAT_H
+#define OCFS2_JBD_COMPAT_H
+
+#ifndef CONFIG_OCFS2_COMPAT_JBD
+# error Should not have been included
+#endif
+
+struct jbd2_inode {
+	unsigned int dummy;
+};
+
+#define JBD2_BARRIER			JFS_BARRIER
+#define JBD2_DEFAULT_MAX_COMMIT_AGE	JBD_DEFAULT_MAX_COMMIT_AGE
+
+#define jbd2_journal_ack_err			journal_ack_err
+#define jbd2_journal_clear_err			journal_clear_err
+#define jbd2_journal_destroy			journal_destroy
+#define jbd2_journal_dirty_metadata		journal_dirty_metadata
+#define jbd2_journal_errno			journal_errno
+#define jbd2_journal_extend			journal_extend
+#define jbd2_journal_flush			journal_flush
+#define jbd2_journal_force_commit		journal_force_commit
+#define jbd2_journal_get_write_access		journal_get_write_access
+#define jbd2_journal_get_undo_access		journal_get_undo_access
+#define jbd2_journal_init_inode			journal_init_inode
+#define jbd2_journal_invalidatepage		journal_invalidatepage
+#define jbd2_journal_load			journal_load
+#define jbd2_journal_lock_updates		journal_lock_updates
+#define jbd2_journal_restart			journal_restart
+#define jbd2_journal_start			journal_start
+#define jbd2_journal_start_commit		journal_start_commit
+#define jbd2_journal_stop			journal_stop
+#define jbd2_journal_try_to_free_buffers	journal_try_to_free_buffers
+#define jbd2_journal_unlock_updates		journal_unlock_updates
+#define jbd2_journal_wipe			journal_wipe
+#define jbd2_log_wait_commit			log_wait_commit
+
+static inline int jbd2_journal_file_inode(handle_t *handle,
+					  struct jbd2_inode *inode)
+{
+	return 0;
+}
+
+static inline int jbd2_journal_begin_ordered_truncate(struct jbd2_inode *inode,
+						      loff_t new_size)
+{
+	return 0;
+}
+
+static inline void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode,
+					       struct inode *inode)
+{
+	return;
+}
+
+static inline void jbd2_journal_release_jbd_inode(journal_t *journal,
+						  struct jbd2_inode *jinode)
+{
+	return;
+}
+
+
+#endif  /* OCFS2_JBD_COMPAT_H */