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-rw-r--r--fs/nilfs2/seglist.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/fs/nilfs2/seglist.h b/fs/nilfs2/seglist.h
new file mode 100644
index 00000000000..d39df9144e9
--- /dev/null
+++ b/fs/nilfs2/seglist.h
@@ -0,0 +1,85 @@
+/*
+ * seglist.h - expediential structure and routines to handle list of segments
+ * (would be removed in a future release)
+ *
+ * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Ryusuke Konishi <ryusuke@osrg.net>
+ *
+ */
+#ifndef _NILFS_SEGLIST_H
+#define _NILFS_SEGLIST_H
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/nilfs2_fs.h>
+#include "sufile.h"
+
+struct nilfs_segment_entry {
+ __u64 segnum;
+
+#define NILFS_SLH_FREED 0x0001 /* The segment was freed provisonally.
+ It must be cancelled if
+ construction aborted */
+
+ unsigned flags;
+ struct list_head list;
+ struct buffer_head *bh_su;
+ struct nilfs_segment_usage *raw_su;
+};
+
+
+void nilfs_dispose_segment_list(struct list_head *);
+
+static inline struct nilfs_segment_entry *
+nilfs_alloc_segment_entry(__u64 segnum)
+{
+ struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS);
+
+ if (likely(ent)) {
+ ent->segnum = segnum;
+ ent->flags = 0;
+ ent->bh_su = NULL;
+ ent->raw_su = NULL;
+ INIT_LIST_HEAD(&ent->list);
+ }
+ return ent;
+}
+
+static inline int nilfs_open_segment_entry(struct nilfs_segment_entry *ent,
+ struct inode *sufile)
+{
+ return nilfs_sufile_get_segment_usage(sufile, ent->segnum,
+ &ent->raw_su, &ent->bh_su);
+}
+
+static inline void nilfs_close_segment_entry(struct nilfs_segment_entry *ent,
+ struct inode *sufile)
+{
+ if (!ent->bh_su)
+ return;
+ nilfs_sufile_put_segment_usage(sufile, ent->segnum, ent->bh_su);
+ ent->bh_su = NULL;
+ ent->raw_su = NULL;
+}
+
+static inline void nilfs_free_segment_entry(struct nilfs_segment_entry *ent)
+{
+ kfree(ent);
+}
+
+#endif /* _NILFS_SEGLIST_H */