[PATCH] OCFS2: The Second Oracle Cluster Filesystem

The OCFS2 file system module.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
new file mode 100644
index 000000000000..12ba897743f4
--- /dev/null
+++ b/fs/ocfs2/alloc.h
@@ -0,0 +1,82 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * alloc.h
+ *
+ * Function prototypes
+ *
+ * Copyright (C) 2002, 2004 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 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 021110-1307, USA.
+ */
+
+#ifndef OCFS2_ALLOC_H
+#define OCFS2_ALLOC_H
+
+struct ocfs2_alloc_context;
+int ocfs2_insert_extent(struct ocfs2_super *osb,
+                        struct ocfs2_journal_handle *handle,
+                        struct inode *inode,
+                        struct buffer_head *fe_bh,
+                        u64 blkno,
+                        u32 new_clusters,
+                        struct ocfs2_alloc_context *meta_ac);
+int ocfs2_num_free_extents(struct ocfs2_super *osb,
+                           struct inode *inode,
+                           struct ocfs2_dinode *fe);
+/* how many new metadata chunks would an allocation need at maximum? */
+static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
+{
+        /*
+         * Rather than do all the work of determining how much we need
+         * (involves a ton of reads and locks), just ask for the
+         * maximal limit.  That's a tree depth shift.  So, one block for
+         * level of the tree (current l_tree_depth), one block for the
+         * new tree_depth==0 extent_block, and one block at the new
+         * top-of-the tree.
+         */
+        return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2;
+}
+
+int ocfs2_truncate_log_init(struct ocfs2_super *osb);
+void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
+void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
+                                       int cancel);
+int ocfs2_flush_truncate_log(struct ocfs2_super *osb);
+int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
+                                      int slot_num,
+                                      struct ocfs2_dinode **tl_copy);
+int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
+                                         struct ocfs2_dinode *tl_copy);
+
+struct ocfs2_truncate_context {
+        struct inode *tc_ext_alloc_inode;
+        struct buffer_head *tc_ext_alloc_bh;
+        int tc_ext_alloc_locked; /* is it cluster locked? */
+        /* these get destroyed once it's passed to ocfs2_commit_truncate. */
+        struct buffer_head *tc_last_eb_bh;
+};
+
+int ocfs2_prepare_truncate(struct ocfs2_super *osb,
+                           struct inode *inode,
+                           struct buffer_head *fe_bh,
+                           struct ocfs2_truncate_context **tc);
+int ocfs2_commit_truncate(struct ocfs2_super *osb,
+                          struct inode *inode,
+                          struct buffer_head *fe_bh,
+                          struct ocfs2_truncate_context *tc);
+
+#endif /* OCFS2_ALLOC_H */