image/metadump.h

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #ifndef __BTRFS_IMAGE_METADUMP_H__
  18 #define __BTRFS_IMAGE_METADUMP_H__
  19
  20 #include "kerncompat.h"
  21 #include "kernel-lib/rbtree.h"
  22 #include "kernel-lib/list.h"
  23 #include "ctree.h"
  24
  25 #define HEADER_MAGIC            0xbd5c25e27295668bULL
  26 #define MAX_PENDING_SIZE        (256 * 1024)
  27 #define BLOCK_SIZE              1024
  28 #define BLOCK_MASK              (BLOCK_SIZE - 1)
  29
  30 #define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
  31                            sizeof(struct meta_cluster_item))
  32
  33 #define COMPRESS_NONE           0
  34 #define COMPRESS_ZLIB           1
  35
  36 struct meta_cluster_item {
  37         __le64 bytenr;
  38         __le32 size;
  39 } __attribute__ ((__packed__));
  40
  41 struct meta_cluster_header {
  42         __le64 magic;
  43         __le64 bytenr;
  44         __le32 nritems;
  45         u8 compress;
  46 } __attribute__ ((__packed__));
  47
  48 /* cluster header + index items + buffers */
  49 struct meta_cluster {
  50         struct meta_cluster_header header;
  51         struct meta_cluster_item items[];
  52 } __attribute__ ((__packed__));
  53
  54 struct fs_chunk {
  55         u64 logical;
  56         u64 physical;
  57         /*
  58          * physical_dup only store additonal physical for BTRFS_BLOCK_GROUP_DUP
  59          * currently restore only support single and DUP
  60          * TODO: modify this structure and the function related to this
  61          * structure for support RAID*
  62          */
  63         u64 physical_dup;
  64         u64 bytes;
  65         struct rb_node l;
  66         struct rb_node p;
  67         struct list_head list;
  68 };
  69
  70 #endif