[linux-2.6-block.git] / fs / ocfs2 / extent_map.h

/* SPDX-License-Identifier: GPL-2.0-only */
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * 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 */
Commit	Line	Data
921a3d4d	1	/* SPDX-License-Identifier: GPL-2.0-only */
ccd979bd MF	2	/* -- mode: c; c-basic-offset: 8; --
	3	* vim: noexpandtab sw=8 ts=8 sts=0:
	4	*
	5	* extent_map.h
	6	*
	7	* In-memory file extent mappings for OCFS2.
	8	*
	9	* Copyright (C) 2004 Oracle. All rights reserved.
ccd979bd MF	10	*/
	11
	12	#ifndef _EXTENT_MAP_H
	13	#define _EXTENT_MAP_H
	14
83418978 MF	15	struct ocfs2_extent_map_item {
	16	unsigned int ei_cpos;
	17	unsigned int ei_phys;
	18	unsigned int ei_clusters;
	19	unsigned int ei_flags;
	20
	21	struct list_head ei_list;
	22	};
	23
	24	#define OCFS2_MAX_EXTENT_MAP_ITEMS 3
	25	struct ocfs2_extent_map {
	26	unsigned int em_num_items;
	27	struct list_head em_list;
	28	};
	29
	30	void ocfs2_extent_map_init(struct inode *inode);
	31	void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
	32	void ocfs2_extent_map_insert_rec(struct inode *inode,
	33	struct ocfs2_extent_rec *rec);
	34
9517bac6	35	int ocfs2_get_clusters(struct inode inode, u32 v_cluster, u32 p_cluster,
49cb8d2d	36	u32 num_clusters, unsigned int extent_flags);
363041a5	37	int ocfs2_extent_map_get_blocks(struct inode inode, u64 v_blkno, u64 p_blkno,
4f902c37	38	u64 ret_count, unsigned int extent_flags);
ccd979bd	39
00dc417f MF	40	int ocfs2_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
	41	u64 map_start, u64 map_len);
	42
ac604d3c GH	43	int ocfs2_overwrite_io(struct inode inode, struct buffer_head di_bh,
	44	u64 map_start, u64 map_len);
	45
93862d5e SM	46	int ocfs2_seek_data_hole_offset(struct file file, loff_t offset, int origin);
93862d5e SM	47
f56654c4 TM	48	int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
f56654c4 TM	49	u32 p_cluster, u32 num_clusters,
1061f9c1 TM	50	struct ocfs2_extent_list *el,
1061f9c1 TM	51	unsigned int *extent_flags);
f56654c4	52
a8549fb5 JB	53	int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
	54	struct buffer_head *bhs[], int flags,
	55	int (validate)(struct super_block sb,
	56	struct buffer_head *bh));
e73a819d TM	57	int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
	58	struct ocfs2_extent_list *el,
	59	struct buffer_head *eb_bh,
	60	u32 v_cluster,
	61	u32 *num_clusters);
a8549fb5 JB	62	static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
	63	struct buffer_head **bh,
	64	int (validate)(struct super_block sb,
	65	struct buffer_head *bh))
	66	{
	67	int status = 0;
	68
	69	if (bh == NULL) {
	70	printk("ocfs2: bh == NULL\n");
	71	status = -EINVAL;
	72	goto bail;
	73	}
	74
	75	status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
	76
	77	bail:
	78	return status;
	79	}
	80
	81
ccd979bd	82	#endif /* _EXTENT_MAP_H */