linux-imx

/* SPDX-License-Identifier: GPL-2.0+ */

/*

 * bmap.h - NILFS block mapping.

 *

 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.

 *

 * Written by Koji Sato.

 */

​

#ifndef _NILFS_BMAP_H

#define _NILFS_BMAP_H

​

#include <linux/types.h>

#include <linux/fs.h>

#include <linux/buffer_head.h>

#include <linux/nilfs2_ondisk.h>    /* nilfs_binfo, nilfs_inode, etc */

#include "alloc.h"

#include "dat.h"

​

#define NILFS_BMAP_INVALID_PTR  0

​

#define nilfs_bmap_keydiff_abs(diff)    ((diff) < 0 ? -(diff) : (diff))

​

​

struct nilfs_bmap;

​

/**

 * union nilfs_bmap_ptr_req - request for bmap ptr

 * @bpr_ptr: bmap pointer

 * @bpr_req: request for persistent allocator

 */

union nilfs_bmap_ptr_req {

    __u64 bpr_ptr;

    struct nilfs_palloc_req bpr_req;

};

​

/**

 * struct nilfs_bmap_stats - bmap statistics

 * @bs_nblocks: number of blocks created or deleted

 */

struct nilfs_bmap_stats {

    unsigned int bs_nblocks;

};

​

/**

 * struct nilfs_bmap_operations - bmap operation table

 */

struct nilfs_bmap_operations {

    int (*bop_lookup)(const struct nilfs_bmap *, __u64, int, __u64 *);

    int (*bop_lookup_contig)(const struct nilfs_bmap *, __u64, __u64 *,

                 unsigned int);

    int (*bop_insert)(struct nilfs_bmap *, __u64, __u64);

    int (*bop_delete)(struct nilfs_bmap *, __u64);

    void (*bop_clear)(struct nilfs_bmap *);

​

    int (*bop_propagate)(struct nilfs_bmap *, struct buffer_head *);

    void (*bop_lookup_dirty_buffers)(struct nilfs_bmap *,

                     struct list_head *);

​

    int (*bop_assign)(struct nilfs_bmap *,

              struct buffer_head **,

              sector_t,

              union nilfs_binfo *);