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TOMOYO Linux Cross Reference
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 
 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 
 48 int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
 49                        u32 *num_clusters, unsigned int *extent_flags);
 50 int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
 51                                 u64 *ret_count, unsigned int *extent_flags);
 52 
 53 int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 54                  u64 map_start, u64 map_len);
 55 
 56 int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
 57 
 58 int 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 
 63 int 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));
 67 int 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);
 72 static 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 
 87 bail:
 88         return status;
 89 }
 90 
 91 
 92 #endif  /* _EXTENT_MAP_H */
 93 

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