fs/ocfs2/extent_map.h

   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_xattr_get_clusters(struct inode *inode, u32 v_cluster,
  57                              u32 *p_cluster, u32 *num_clusters,
  58                              struct ocfs2_extent_list *el);
  59
  60 int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
  61                            struct buffer_head *bhs[], int flags,
  62                            int (*validate)(struct super_block *sb,
  63                                            struct buffer_head *bh));
  64 static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
  65                                         struct buffer_head **bh,
  66                                         int (*validate)(struct super_block *sb,
  67                                                         struct buffer_head *bh))
  68 {
  69         int status = 0;
  70
  71         if (bh == NULL) {
  72                 printk("ocfs2: bh == NULL\n");
  73                 status = -EINVAL;
  74                 goto bail;
  75         }
  76
  77         status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
  78
  79 bail:
  80         return status;
  81 }
  82
  83
  84 #endif  /* _EXTENT_MAP_H */