fs/btrfs/volumes.h

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #ifndef __BTRFS_VOLUMES_
  20 #define __BTRFS_VOLUMES_
  21 struct btrfs_device {
  22         struct list_head dev_list;
  23         struct btrfs_root *dev_root;
  24
  25         struct block_device *bdev;
  26
  27         /* the internal btrfs device id */
  28         u64 devid;
  29
  30         /* size of the device */
  31         u64 total_bytes;
  32
  33         /* bytes used */
  34         u64 bytes_used;
  35
  36         /* optimal io alignment for this device */
  37         u32 io_align;
  38
  39         /* optimal io width for this device */
  40         u32 io_width;
  41
  42         /* minimal io size for this device */
  43         u32 sector_size;
  44
  45         /* type and info about this device */
  46         u64 type;
  47
  48         /* physical drive uuid (or lvm uuid) */
  49         u8 uuid[BTRFS_DEV_UUID_SIZE];
  50 };
  51
  52 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
  53                            struct btrfs_device *device,
  54                            u64 owner, u64 num_bytes, u64 *start);
  55 int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
  56                     u64 logical, u64 *phys, u64 *length,
  57                     struct btrfs_device **dev);
  58 int btrfs_read_sys_array(struct btrfs_root *root);
  59 int btrfs_read_chunk_tree(struct btrfs_root *root);
  60 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
  61                       struct btrfs_root *extent_root, u64 *start,
  62                       u64 *num_bytes, u64 type);
  63 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
  64 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
  65 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
  66 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
  67 #endif