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         int fd;
  26
  27         char *name;
  28
  29         /* the internal btrfs device id */
  30         u64 devid;
  31
  32         /* size of the device */
  33         u64 total_bytes;
  34
  35         /* bytes used */
  36         u64 bytes_used;
  37
  38         /* optimal io alignment for this device */
  39         u32 io_align;
  40
  41         /* optimal io width for this device */
  42         u32 io_width;
  43
  44         /* minimal io size for this device */
  45         u32 sector_size;
  46
  47         /* type and info about this device */
  48         u64 type;
  49
  50         /* physical drive uuid (or lvm uuid) */
  51         u8 uuid[BTRFS_DEV_UUID_SIZE];
  52 };
  53
  54 struct btrfs_fs_devices {
  55         u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
  56
  57         /* the device with this id has the most recent coyp of the super */
  58         u64 latest_devid;
  59         u64 latest_trans;
  60         u64 lowest_devid;
  61         int latest_bdev;
  62         int lowest_bdev;
  63         struct list_head devices;
  64         struct list_head list;
  65 };
  66
  67 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
  68                            struct btrfs_device *device,
  69                            u64 owner, u64 num_bytes, u64 *start);
  70 int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
  71                     u64 logical, u64 *phys, u64 *length,
  72                     struct btrfs_device **dev);
  73 int btrfs_read_sys_array(struct btrfs_root *root);
  74 int btrfs_read_chunk_tree(struct btrfs_root *root);
  75 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
  76                       struct btrfs_root *extent_root, u64 *start,
  77                       u64 *num_bytes, u64 type);
  78 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
  79 int btrfs_add_device(struct btrfs_trans_handle *trans,
  80                      struct btrfs_root *root,
  81                      struct btrfs_device *device);
  82 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
  83                        int flags);
  84 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
  85 int btrfs_add_device(struct btrfs_trans_handle *trans,
  86                      struct btrfs_root *root,
  87                      struct btrfs_device *device);
  88 int btrfs_scan_one_device(int fd, const char *path,
  89                           struct btrfs_fs_devices **fs_devices_ret,
  90                           u64 *total_devs, u64 super_offset);
  91 #endif