1 files changed, 102 insertions, 0 deletions
diff --git a/fs/nilfs2/sb.h b/fs/nilfs2/sb.h
new file mode 100644
index 000000000000..adccd4fc654e
--- /dev/null
+++ b/fs/nilfs2/sb.h
@@ -0,0 +1,102 @@
+/*
+ * sb.h - NILFS on-memory super block structure.
+ *
+ * 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_SB
+#define _NILFS_SB
+
+#include <linux/types.h>
+#include <linux/fs.h>
+
+/*
+ * Mount options
+ */
+struct nilfs_mount_options {
+	unsigned long mount_opt;
+	__u64 snapshot_cno;
+};
+
+struct the_nilfs;
+struct nilfs_sc_info;
+
+/*
+ * NILFS super-block data in memory
+ */
+struct nilfs_sb_info {
+	/* Snapshot status */
+	__u64 s_snapshot_cno;		/* Checkpoint number */
+	atomic_t s_inodes_count;
+	atomic_t s_blocks_count;	/* Reserved (might be deleted) */
+
+	/* Mount options */
+	unsigned long s_mount_opt;
+	uid_t s_resuid;
+	gid_t s_resgid;
+
+	unsigned long s_interval;	/* construction interval */
+	unsigned long s_watermark;	/* threshold of data amount
+					   for the segment construction */
+
+	/* Fundamental members */
+	struct super_block *s_super;	/* reverse pointer to super_block */
+	struct the_nilfs *s_nilfs;
+	struct list_head s_list;	/* list head for nilfs->ns_supers */
+
+	/* Segment constructor */
+	struct list_head s_dirty_files;	/* dirty files list */
+	struct nilfs_sc_info *s_sc_info; /* segment constructor info */
+	spinlock_t s_inode_lock;	/* Lock for the nilfs inode.
+					   It covers s_dirty_files list */
+
+	/* Metadata files */
+	struct inode *s_ifile;		/* index file inode */
+
+	/* Inode allocator */
+	spinlock_t s_next_gen_lock;
+	u32 s_next_generation;
+};
+
+static inline struct nilfs_sb_info *NILFS_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+static inline struct nilfs_sc_info *NILFS_SC(struct nilfs_sb_info *sbi)
+{
+	return sbi->s_sc_info;
+}
+
+/*
+ * Bit operations for the mount option
+ */
+#define nilfs_clear_opt(sbi, opt)  \
+	do { (sbi)->s_mount_opt &= ~NILFS_MOUNT_##opt; } while (0)
+#define nilfs_set_opt(sbi, opt)  \
+	do { (sbi)->s_mount_opt |= NILFS_MOUNT_##opt; } while (0)
+#define nilfs_test_opt(sbi, opt)   ((sbi)->s_mount_opt & NILFS_MOUNT_##opt)
+#define nilfs_write_opt(sbi, mask, opt)					\
+	do { (sbi)->s_mount_opt =					\
+		(((sbi)->s_mount_opt & ~NILFS_MOUNT_##mask) |		\
+		 NILFS_MOUNT_##opt);					\
+	} while (0)
+
+#endif /* _NILFS_SB */