[net-next-2.6.git] / fs / ocfs2 / extent_map.h

/* -*- 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.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License, version 2,  as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#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_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
ccd979bd MF	1	/* -- mode: c; c-basic-offset: 8; --
	2	* vim: noexpandtab sw=8 ts=8 sts=0:
	3	*
	4	* extent_map.h
	5	*
	6	* In-memory file extent mappings for OCFS2.
	7	*
	8	* Copyright (C) 2004 Oracle. All rights reserved.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public
	12	* License, version 2, as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public
	20	* License along with this program; if not, write to the
	21	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	22	* Boston, MA 021110-1307, USA.
	23	*/
	24
	25	#ifndef _EXTENT_MAP_H
	26	#define _EXTENT_MAP_H
	27
83418978 MF	28	struct ocfs2_extent_map_item {
	29	unsigned int ei_cpos;
	30	unsigned int ei_phys;
	31	unsigned int ei_clusters;
	32	unsigned int ei_flags;
	33
	34	struct list_head ei_list;
	35	};
	36
	37	#define OCFS2_MAX_EXTENT_MAP_ITEMS 3
	38	struct ocfs2_extent_map {
	39	unsigned int em_num_items;
	40	struct list_head em_list;
	41	};
	42
	43	void ocfs2_extent_map_init(struct inode *inode);
	44	void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
	45	void ocfs2_extent_map_insert_rec(struct inode *inode,
	46	struct ocfs2_extent_rec *rec);
	47
9517bac6	48	int ocfs2_get_clusters(struct inode inode, u32 v_cluster, u32 p_cluster,
49cb8d2d	49	u32 num_clusters, unsigned int extent_flags);
363041a5	50	int ocfs2_extent_map_get_blocks(struct inode inode, u64 v_blkno, u64 p_blkno,
4f902c37	51	u64 ret_count, unsigned int extent_flags);
ccd979bd	52
00dc417f MF	53	int ocfs2_fiemap(struct inode inode, struct fiemap_extent_info fieinfo,
	54	u64 map_start, u64 map_len);
	55
f56654c4 TM	56	int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
f56654c4 TM	57	u32 p_cluster, u32 num_clusters,
1061f9c1 TM	58	struct ocfs2_extent_list *el,
1061f9c1 TM	59	unsigned int *extent_flags);
f56654c4	60
a8549fb5 JB	61	int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
	62	struct buffer_head *bhs[], int flags,
	63	int (validate)(struct super_block sb,
	64	struct buffer_head *bh));
e73a819d TM	65	int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
	66	struct ocfs2_extent_list *el,
	67	struct buffer_head *eb_bh,
	68	u32 v_cluster,
	69	u32 *num_clusters);
a8549fb5 JB	70	static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
	71	struct buffer_head **bh,
	72	int (validate)(struct super_block sb,
	73	struct buffer_head *bh))
	74	{
	75	int status = 0;
	76
	77	if (bh == NULL) {
	78	printk("ocfs2: bh == NULL\n");
	79	status = -EINVAL;
	80	goto bail;
	81	}
	82
	83	status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
	84
	85	bail:
	86	return status;
	87	}
	88
	89
ccd979bd	90	#endif /* _EXTENT_MAP_H */