summaryrefslogtreecommitdiff
path: root/fs/nilfs2/sb.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nilfs2/sb.h')
-rw-r--r--fs/nilfs2/sb.h102
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 */