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authorKoji Sato <sato.koji@lab.ntt.co.jp>2009-04-06 19:01:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:13 -0700
commit17c76b0104e4a6513983777e1a17e0297a12b0c4 (patch)
tree49b145378f5004401f71a7aa8d8cb3f149e77f0f /fs/nilfs2/btree.h
parentbdb265eae08db578e7cf5739be16f389d495fc75 (diff)
downloadop-kernel-dev-17c76b0104e4a6513983777e1a17e0297a12b0c4.zip
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nilfs2: B-tree based block mapping
This adds declarations and functions of NILFS2 B-tree. Two variants are integrated in the NILFS2 B-tree. The B-tree for the most files points to the child nodes or data blocks with virtual block addresses, whereas the B-tree of the DAT uses actual block addresses. 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>
Diffstat (limited to 'fs/nilfs2/btree.h')
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1 files changed, 117 insertions, 0 deletions
diff --git a/fs/nilfs2/btree.h b/fs/nilfs2/btree.h
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+++ b/fs/nilfs2/btree.h
@@ -0,0 +1,117 @@
+/*
+ * btree.h - NILFS B-tree.
+ *
+ * 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 Koji Sato <koji@osrg.net>.
+ */
+
+#ifndef _NILFS_BTREE_H
+#define _NILFS_BTREE_H
+
+#include <linux/types.h>
+#include <linux/buffer_head.h>
+#include <linux/list.h>
+#include <linux/nilfs2_fs.h>
+#include "btnode.h"
+#include "bmap.h"
+
+struct nilfs_btree;
+struct nilfs_btree_path;
+
+/**
+ * struct nilfs_btree_operations - B-tree operation table
+ */
+struct nilfs_btree_operations {
+ __u64 (*btop_find_target)(const struct nilfs_btree *,
+ const struct nilfs_btree_path *, __u64);
+ void (*btop_set_target)(struct nilfs_btree *, __u64, __u64);
+
+ struct the_nilfs *(*btop_get_nilfs)(struct nilfs_btree *);
+
+ int (*btop_propagate)(struct nilfs_btree *,
+ struct nilfs_btree_path *,
+ int,
+ struct buffer_head *);
+ int (*btop_assign)(struct nilfs_btree *,
+ struct nilfs_btree_path *,
+ int,
+ struct buffer_head **,
+ sector_t,
+ union nilfs_binfo *);
+};
+
+/**
+ * struct nilfs_btree_node - B-tree node
+ * @bn_flags: flags
+ * @bn_level: level
+ * @bn_nchildren: number of children
+ * @bn_pad: padding
+ */
+struct nilfs_btree_node {
+ __u8 bn_flags;
+ __u8 bn_level;
+ __le16 bn_nchildren;
+ __le32 bn_pad;
+};
+
+/* flags */
+#define NILFS_BTREE_NODE_ROOT 0x01
+
+/* level */
+#define NILFS_BTREE_LEVEL_DATA 0
+#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
+#define NILFS_BTREE_LEVEL_MAX 14
+
+/**
+ * struct nilfs_btree - B-tree structure
+ * @bt_bmap: bmap base structure
+ * @bt_ops: B-tree operation table
+ */
+struct nilfs_btree {
+ struct nilfs_bmap bt_bmap;
+
+ /* B-tree-specific members */
+ const struct nilfs_btree_operations *bt_ops;
+};
+
+
+#define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
+#define NILFS_BTREE_ROOT_NCHILDREN_MAX \
+ ((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \
+ (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
+#define NILFS_BTREE_ROOT_NCHILDREN_MIN 0
+#define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(__le64))
+#define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) \
+ (((nodesize) - sizeof(struct nilfs_btree_node) - \
+ NILFS_BTREE_NODE_EXTRA_PAD_SIZE) / \
+ (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
+#define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize) \
+ ((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1)
+#define NILFS_BTREE_KEY_MIN ((__u64)0)
+#define NILFS_BTREE_KEY_MAX (~(__u64)0)
+
+
+int nilfs_btree_path_cache_init(void);
+void nilfs_btree_path_cache_destroy(void);
+int nilfs_btree_init(struct nilfs_bmap *, __u64, __u64);
+int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
+ const __u64 *, const __u64 *,
+ int, __u64, __u64);
+void nilfs_btree_init_gc(struct nilfs_bmap *);
+
+#endif /* _NILFS_BTREE_H */
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