81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* extent_map.h
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*
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* In-memory file extent mappings for OCFS2.
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*
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* Copyright (C) 2004 Oracle. All rights reserved.
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*/
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#ifndef _EXTENT_MAP_H
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#define _EXTENT_MAP_H
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struct ocfs2_extent_map_item {
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unsigned int ei_cpos;
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unsigned int ei_phys;
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unsigned int ei_clusters;
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unsigned int ei_flags;
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struct list_head ei_list;
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};
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#define OCFS2_MAX_EXTENT_MAP_ITEMS 3
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struct ocfs2_extent_map {
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unsigned int em_num_items;
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struct list_head em_list;
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};
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void ocfs2_extent_map_init(struct inode *inode);
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void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
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void ocfs2_extent_map_insert_rec(struct inode *inode,
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struct ocfs2_extent_rec *rec);
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int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
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u32 *num_clusters, unsigned int *extent_flags);
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int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
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u64 *ret_count, unsigned int *extent_flags);
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int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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u64 map_start, u64 map_len);
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int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
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u64 map_start, u64 map_len);
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int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
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int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
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u32 *p_cluster, u32 *num_clusters,
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struct ocfs2_extent_list *el,
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unsigned int *extent_flags);
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int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
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struct buffer_head *bhs[], int flags,
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int (*validate)(struct super_block *sb,
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struct buffer_head *bh));
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int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
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struct ocfs2_extent_list *el,
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struct buffer_head *eb_bh,
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u32 v_cluster,
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u32 *num_clusters);
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static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
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struct buffer_head **bh,
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int (*validate)(struct super_block *sb,
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struct buffer_head *bh))
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{
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int status = 0;
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if (bh == NULL) {
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printk("ocfs2: bh == NULL\n");
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status = -EINVAL;
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goto bail;
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}
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status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
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bail:
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return status;
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}
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#endif /* _EXTENT_MAP_H */
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