linux/fs/ocfs2/extent_map.h
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   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
  28struct 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
  38struct ocfs2_extent_map {
  39        unsigned int                    em_num_items;
  40        struct list_head                em_list;
  41};
  42
  43void ocfs2_extent_map_init(struct inode *inode);
  44void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
  45void ocfs2_extent_map_insert_rec(struct inode *inode,
  46                                 struct ocfs2_extent_rec *rec);
  47
  48int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
  49                       u32 *num_clusters, unsigned int *extent_flags);
  50int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
  51                                u64 *ret_count, unsigned int *extent_flags);
  52
  53int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
  54                 u64 map_start, u64 map_len);
  55
  56int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
  57
  58int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
  59                             u32 *p_cluster, u32 *num_clusters,
  60                             struct ocfs2_extent_list *el,
  61                             unsigned int *extent_flags);
  62
  63int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
  64                           struct buffer_head *bhs[], int flags,
  65                           int (*validate)(struct super_block *sb,
  66                                           struct buffer_head *bh));
  67int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
  68                               struct ocfs2_extent_list *el,
  69                               struct buffer_head *eb_bh,
  70                               u32 v_cluster,
  71                               u32 *num_clusters);
  72static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
  73                                        struct buffer_head **bh,
  74                                        int (*validate)(struct super_block *sb,
  75                                                        struct buffer_head *bh))
  76{
  77        int status = 0;
  78
  79        if (bh == NULL) {
  80                printk("ocfs2: bh == NULL\n");
  81                status = -EINVAL;
  82                goto bail;
  83        }
  84
  85        status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
  86
  87bail:
  88        return status;
  89}
  90
  91
  92#endif  /* _EXTENT_MAP_H */
  93
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