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Diffstat (limited to '')
| -rw-r--r-- | fs/ocfs2/extent_map.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/fs/ocfs2/extent_map.h b/fs/ocfs2/extent_map.h new file mode 100644 index 000000000..1057586ec --- /dev/null +++ b/fs/ocfs2/extent_map.h @@ -0,0 +1,95 @@ +/* -*- 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_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 */ |