linux-stable/fs/nilfs2/btree.h
Ryusuke Konishi ae98043f5f nilfs2: convert to SPDX license tags
Remove the verbose license text from NILFS2 files and replace them with
SPDX tags.  This does not change the license of any of the code.

Link: http://lkml.kernel.org/r/1535624528-5982-1-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-09-04 16:45:02 -07:00

64 lines
2 KiB
C

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* btree.h - NILFS B-tree.
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* Written by Koji Sato.
*/
#ifndef _NILFS_BTREE_H
#define _NILFS_BTREE_H
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/list.h>
#include <linux/nilfs2_ondisk.h> /* nilfs_btree_node */
#include "btnode.h"
#include "bmap.h"
/**
* struct nilfs_btree_path - A path on which B-tree operations are executed
* @bp_bh: buffer head of node block
* @bp_sib_bh: buffer head of sibling node block
* @bp_index: index of child node
* @bp_oldreq: ptr end request for old ptr
* @bp_newreq: ptr alloc request for new ptr
* @bp_op: rebalance operation
*/
struct nilfs_btree_path {
struct buffer_head *bp_bh;
struct buffer_head *bp_sib_bh;
int bp_index;
union nilfs_bmap_ptr_req bp_oldreq;
union nilfs_bmap_ptr_req bp_newreq;
struct nilfs_btnode_chkey_ctxt bp_ctxt;
void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *,
int, __u64 *, __u64 *);
};
#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)
extern struct kmem_cache *nilfs_btree_path_cache;
int nilfs_btree_init(struct nilfs_bmap *);
int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
const __u64 *, const __u64 *, int);
void nilfs_btree_init_gc(struct nilfs_bmap *);
int nilfs_btree_broken_node_block(struct buffer_head *bh);
#endif /* _NILFS_BTREE_H */