/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * extent_map.h
 *
 * In-memory file extent mappings for OCFS2.
 *
 * Copyright (C) 2004 Oracle.  All rights reserved.
 */

#ifndef _EXTENT_MAP_H
#define _EXTENT_MAP_H

struct ocfs2_extent_map_item {
        unsigned int                    ei_cpos;
        unsigned int                    ei_phys;
        unsigned int                    ei_clusters;
        unsigned int                    ei_flags;

        struct list_head                ei_list;
};

#define OCFS2_MAX_EXTENT_MAP_ITEMS                      3
struct ocfs2_extent_map {
        unsigned int                    em_num_items;
        struct list_head                em_list;
};

void ocfs2_extent_map_init(struct inode *inode);
void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
void ocfs2_extent_map_insert_rec(struct inode *inode,
                                 struct ocfs2_extent_rec *rec);

int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
                       u32 *num_clusters, unsigned int *extent_flags);
int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
                                u64 *ret_count, unsigned int *extent_flags);

int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
                 u64 map_start, u64 map_len);

int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
                       u64 map_start, u64 map_len);

int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);

int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
                             u32 *p_cluster, u32 *num_clusters,
                             struct ocfs2_extent_list *el,
                             unsigned int *extent_flags);

int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
                           struct buffer_head *bhs[], int flags,
                           int (*validate)(struct super_block *sb,
                                           struct buffer_head *bh));
int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
                               struct ocfs2_extent_list *el,
                               struct buffer_head *eb_bh,
                               u32 v_cluster,
                               u32 *num_clusters);
static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
                                        struct buffer_head **bh,
                                        int (*validate)(struct super_block *sb,
                                                        struct buffer_head *bh))
{
        int status = 0;

        if (bh == NULL) {
                printk("ocfs2: bh == NULL\n");
                status = -EINVAL;
                goto bail;
        }

        status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);

bail:
        return status;
}


#endif  /* _EXTENT_MAP_H */