nilfs2: segment usage file

This adds a meta data file which stores the allocation state of segments.

[konishi.ryusuke@lab.ntt.co.jp: fix wrong counting of checkpoints and dirty segments]
Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h
new file mode 100644
index 000000000000..d595f33a768d
--- /dev/null
+++ b/fs/nilfs2/sufile.h
@@ -0,0 +1,54 @@
+/*
+ * sufile.h - NILFS segment usage file.
+ *
+ * Copyright (C) 2006-2008 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 Koji Sato <koji@osrg.net>.
+ */
+
+#ifndef _NILFS_SUFILE_H
+#define _NILFS_SUFILE_H
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/nilfs2_fs.h>
+#include "mdt.h"
+
+#define NILFS_SUFILE_GFP        NILFS_MDT_GFP
+
+static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
+{
+        return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
+}
+
+int nilfs_sufile_alloc(struct inode *, __u64 *);
+int nilfs_sufile_cancel_free(struct inode *, __u64);
+int nilfs_sufile_freev(struct inode *, __u64 *, size_t);
+int nilfs_sufile_free(struct inode *, __u64);
+int nilfs_sufile_get_segment_usage(struct inode *, __u64,
+                                   struct nilfs_segment_usage **,
+                                   struct buffer_head **);
+void nilfs_sufile_put_segment_usage(struct inode *, __u64,
+                                    struct buffer_head *);
+int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
+int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *);
+int nilfs_sufile_set_error(struct inode *, __u64);
+ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *,
+                                size_t);
+
+
+#endif  /* _NILFS_SUFILE_H */